160+ calculators: take-home pay for 166 countries, mortgage, loan, VAT, BMI, dates, units, currency.
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Tools
| Tool | Description | Behaviour |
|---|---|---|
| 401k_calculator | A 401k calculator with the 2026 $24,500 limit and catch-ups built in: project your balance at retirement from your match, raises and returns, year by year. Web page: https://calcbright.com/401k-calculator | Read-only |
| age_calculator | Your exact age in years, months and days from your date of birth, plus total weeks and days, the weekday you were born and how long until your next birthday. Web page: https://calcbright.com/age-calculator | Read-only |
| amortization_calculator | This amortization calculator splits every payment into principal and interest, shows your payoff date and what extra payments save, and exports to CSV. Web page: https://calcbright.com/amortization-calculator | Read-only |
| annuity_calculator | An annuity calculator for fixed-term income: what a lump sum pays monthly over 10–30 years, or the pot needed for a target payment, level or rising yearly. Web page: https://calcbright.com/annuity-calculator | Read-only |
| apr_calculator | A 7% loan with a $1,000 fee really costs 9.17%. This APR calculator folds origination fees and points into the true rate, payment and full cost of borrowing. Web page: https://calcbright.com/apr-calculator | Read-only |
| area_calculator | Area of a rectangle, square, triangle, circle, trapezoid, parallelogram or ellipse from your measurements, with the formula and the working shown. Web page: https://calcbright.com/area-calculator | Read-only |
| auto_loan_calculator | AED 96,000 at 2.49% flat over 5 years is AED 1,799.20 a month – really 4.72% APR. This car loan calculator adds VAT, trade-in and a final balloon payment. Web page: https://calcbright.com/auto-loan-calculator | Read-only |
| average_calculator | Paste a list of numbers to get the mean, median, mode, range, sum and count at once – with the working for each, so you can see why mean and median differ. Web page: https://calcbright.com/average-calculator | Read-only |
| bmi_calculator | 70 kg at 1.75 m is a BMI of 22.9. Check your Body Mass Index in kg/cm or lb/ft, the healthy weight range for your height, your BMR and daily calorie needs. Web page: https://calcbright.com/bmi-calculator | Read-only |
| bmr_calculator | Your basal metabolic rate from Mifflin–St Jeor, revised Harris–Benedict and Katch–McArdle side by side, plus daily calorie needs at five activity levels. Web page: https://calcbright.com/bmr-calculator | Read-only |
| body_fat_calculator | Body fat % from a tape measure with the US Navy (Hodgdon–Beckett) formula: enter neck, waist and hips to get your ACE category, fat mass and lean mass. Web page: https://calcbright.com/body-fat-calculator | Read-only |
| body_surface_area_calculator | A person 170 cm tall weighing 70 kg has a body surface area of 1.82 m² by the Mosteller formula. See Du Bois and Haycock results next to it, in metric or imperial. Web page: https://calcbright.com/body-surface-area-calculator | Read-only |
| break_even_calculator | How many units must you sell before you make a profit? Enter fixed costs, price and variable cost to get break-even units, revenue and contribution margin. Web page: https://calcbright.com/break-even-calculator | Read-only |
| btu_calculator | Size an air conditioner or heater in BTU/h, tons and kW from room area, ceiling height, sun and occupants – with a Gulf climate setting for the UAE and Saudi. Web page: https://calcbright.com/btu-calculator | Read-only |
| budget_calculator | Budget your take-home pay with the 50/30/20 rule – needs, wants and savings in monthly amounts – or set your own split, such as 60/20/20 for high-rent cities. Web page: https://calcbright.com/budget-calculator | Read-only |
| business_days_calculator | Count Monday–Friday working days between two dates (January 2026 has 22), or add business days to a start date to find a shipping or contract deadline. Web page: https://calcbright.com/business-days-calculator | Read-only |
| cagr_calculator | A CAGR calculator for the steady yearly rate between two values: $10,000 to $20,000 in 5 years is 14.87% a year. Use it for investments, revenue or users. Web page: https://calcbright.com/cagr-calculator | Read-only |
| calorie_deficit_calculator | Your maintenance calories, a daily target for losing 0.25–1 kg (0.5–2 lb) a week and the weeks to your goal weight – never set below safe minimum intakes. Web page: https://calcbright.com/calorie-deficit-calculator | Read-only |
| calories_burned_calculator | Calories burned walking, running, cycling, swimming, lifting and 20+ more activities, from Compendium MET values, your body weight and the time spent. Web page: https://calcbright.com/calories-burned-calculator | Read-only |
| canadian_mortgage_calculator | Canadian mortgage payments with semi-annual compounding, CMHC premiums, the minimum down payment and accelerated bi-weekly or weekly options. Web page: https://calcbright.com/canadian-mortgage-calculator | Read-only |
| capital_gains_tax_calculator | 2026 US federal tax on a stock, crypto or property sale: long-term 0%, 15% or 20% versus short-term ordinary rates, plus the 3.8% NIIT where it applies. Web page: https://calcbright.com/capital-gains-tax-calculator | Read-only |
| car_lease_calculator | Car lease payment from price, MSRP, residual, money factor or APR, term and sales tax – split into depreciation, finance charge and tax to check a dealer quote. Web page: https://calcbright.com/car-lease-calculator | Read-only |
| case_converter | Switch text to UPPER, lower, Title or Sentence case, or to camelCase, snake_case and kebab-case for code. It all runs in your browser; nothing is uploaded. Web page: https://calcbright.com/case-converter | Read-only |
| cd_calculator | A CD calculator for interest earned by maturity, with APY to APR conversion for any compounding – the same maths for Canadian GICs, UK bonds and GCC deposits. Web page: https://calcbright.com/cd-calculator | Read-only |
| circle_calculator | Know a circle’s radius, diameter, circumference or area? Enter any one to get the other three, with the formulas, the working and answers in terms of π. Web page: https://calcbright.com/circle-calculator | Read-only |
| color_converter | Convert any color between HEX, RGB, HSL, HSV and CMYK, preview the swatch, check WCAG 2 contrast on white and black, and get a palette of tints and shades. Web page: https://calcbright.com/color-converter | Read-only |
| commission_calculator | Sales commission from the sale amount and rate, plus base salary for total pay – and a table comparing earnings at other rates. Works tier by tier too. Web page: https://calcbright.com/commission-calculator | Read-only |
| compound_interest_calculator | $10,000 plus $200 a month at 7% grows to $144,572.72 in 20 years, $86,572.72 of it interest. See the AER, the value after inflation and Gulf savings examples. Web page: https://calcbright.com/compound-interest-calculator | Read-only |
| concrete_calculator | Concrete for slabs, wall footings and post holes in cubic yards and cubic meters, plus how many 40, 60 or 80 lb or 25 kg premix bags to buy for the job. Web page: https://calcbright.com/concrete-calculator | Read-only |
| confidence_interval_calculator | Confidence intervals for a mean (t or z) or a proportion (Wald and Wilson) at 80–99.9% confidence – margin of error, critical value and every step shown. Web page: https://calcbright.com/confidence-interval-calculator | Read-only |
| cooking_converter | Cups, tablespoons and teaspoons to grams or ounces by each ingredient’s density – a cup of flour is 125 g, a cup of sugar 200 g. US cups, with charts. Web page: https://calcbright.com/cooking-converter | Read-only |
| countdown_calculator | How many days until Christmas, New Year or your own date? See the days, weeks, months and hours left – or the days since a date that has already passed. Web page: https://calcbright.com/countdown-calculator | Read-only |
| credit_card_payoff_calculator | AED 10,000 at 3.25% a month on only the 5% minimum takes 9 years 9 months and AED 14,869.55 interest. Credit card payoff dates and payments for UAE, KSA, US. Web page: https://calcbright.com/credit-card-payoff-calculator | Read-only |
| currency_converter | USD 1,000 is always AED 3,672.50 and AED 10,000 is SAR 10,211.03 at the Gulf pegs. Convert 39 currencies at mid-market rates refreshed several times a day. Web page: https://calcbright.com/currency-converter | Read-only |
| date_calculator | Add or subtract days, weeks, months or years from any date to get the exact date and weekday – like 90 days from today. Leap years and month ends handled. Web page: https://calcbright.com/date-calculator | Read-only |
| date_difference_calculator | Days between two dates, also shown in weeks, months and years, with weekday and weekend counts. Choose whether to include the end date for event lengths. Web page: https://calcbright.com/date-difference-calculator | Read-only |
| day_of_week_calculator | What day of the week was it? Get the weekday for any date from 1000 to 9999 – birthdays, historic events, future plans – with Zeller’s working shown. Web page: https://calcbright.com/day-of-week-calculator | Read-only |
| debt_payoff_calculator | A debt payoff calculator that runs the snowball and avalanche across all your debts: debt-free date, total interest and the order each balance is cleared. Web page: https://calcbright.com/debt-payoff-calculator | Read-only |
| debt_to_income_calculator | A 35% debt-to-income ratio passes most US lenders. Gulf banks cap installments at 50% of salary in the UAE, 33.33% in Saudi Arabia and 40% in Kuwait. Web page: https://calcbright.com/debt-to-income-calculator | Read-only |
| depreciation_calculator | Depreciation calculator: yearly schedules and book value for straight-line, double-declining balance, sum-of-the-years’ digits and units of production. Web page: https://calcbright.com/depreciation-calculator | Read-only |
| discount_calculator | Sale price and savings for any percent off, plus the true total when discounts stack: 25% off and then an extra 10% off is 32.5% in total, not 35%. Web page: https://calcbright.com/discount-calculator | Read-only |
| dividend_yield_calculator | A $50 stock paying $0.50 a quarter yields 4%. Get the dividend yield for monthly, quarterly or annual payers, plus the cash income your shares produce. Web page: https://calcbright.com/dividend-yield-calculator | Read-only |
| dld_fee_calculator | A AED 2M Dubai home bought for cash costs AED 126,780 in fees (6.34%): the 4% DLD transfer fee, trustee office, title deed and 2% agent commission plus VAT. Web page: https://calcbright.com/dld-fee-calculator | Read-only |
| down_payment_calculator | Down payment, loan amount and LTV for any home price, with 3%, 5%, 10% and 20% down side by side – and a flag for when PMI applies below 20% equity. Web page: https://calcbright.com/down-payment-calculator | Read-only |
| dubai_mortgage_calculator | AED 1.6M over 25 years at 4.25% is AED 8,667.81 a month. Get your Dubai mortgage EMI, the Central Bank’s minimum down payment and the full cash needed. Web page: https://calcbright.com/dubai-mortgage-calculator | Read-only |
| egypt_end_of_service_calculator | EGP 15,000 a month for 7 years: at least EGP 210,000 for an unjustified dismissal, plus EGP 45,000 if you got no notice – Egypt’s 2025 Labour Law. Web page: https://calcbright.com/egypt-end-of-service-calculator | Read-only |
| egypt_social_insurance_calculator | On an EGP 10,000 insurable wage you pay EGP 1,100 a month (11%) and your employer EGP 1,875 (18.75%). 2026 limits: EGP 2,700 to 16,700 under Law 148. Web page: https://calcbright.com/egypt-social-insurance-calculator | Read-only |
| electricity_cost_calculator | A 100 W TV on 5 hours a day costs about $2.55 a month at 17¢/kWh. Turn any appliance’s watts and hours of use into kWh and running cost by day, month and year. Web page: https://calcbright.com/electricity-cost-calculator | Read-only |
| exponent_calculator | Exponent calculator for 8^(2/3), 2⁻³ or 2^100: handles negative, decimal and fractional powers and nth roots, with exact big integers and the rule used. Web page: https://calcbright.com/exponent-calculator | Read-only |
| fd_calculator | FD calculator after TDS: ₹10 lakh at 6.5% for 3 years matures at ₹12,13,407.58 tax-free in an NRE FD, or ₹11,85,215.56 in an NRO FD at the UAE treaty rate. Web page: https://calcbright.com/fd-calculator | Read-only |
| fha_loan_calculator | FHA payments at 3.5% down include a 1.75% upfront MIP plus 0.50–0.55% a year. See the full monthly cost with tax and insurance beside a conventional loan. Web page: https://calcbright.com/fha-loan-calculator | Read-only |
| flooring_calculator | A 12 × 12 ft room with 10% waste needs 8 boxes of 20 sq ft. Turn room size into boxes of laminate, vinyl plank, tile or hardwood to buy, and the material cost. Web page: https://calcbright.com/flooring-calculator | Read-only |
| fraction_calculator | Type 1/2 + 3/4 or 2 3/8 ÷ 1 1/4 and get the answer in lowest terms, as a mixed number and as a decimal, with the common-denominator steps written out. Web page: https://calcbright.com/fraction-calculator | Read-only |
| fuel_cost_calculator | 250 miles at 30 mpg and $3.50 a gallon is $29.17 in gas. Price any one-way or round trip in mpg, L/100 km or km/L, and split the cost between passengers. Web page: https://calcbright.com/fuel-cost-calculator | Read-only |
| fuel_economy_converter | Convert mpg to L/100km, km/L or UK mpg in one step: 30 mpg (US) is 7.84 L/100 km and 36.03 imperial mpg. Includes a reference chart for 4–12 L/100 km. Web page: https://calcbright.com/fuel-economy-converter | Read-only |
| future_value_calculator | How much will $10,000 plus $200 a month be worth in 10 years? This future value calculator answers that – or solves backwards for the present value of a target. Web page: https://calcbright.com/future-value-calculator | Read-only |
| gcc_gratuity_calculator | QAR 10,000 basic for 7 years earns QAR 49,000 in Qatar. End-of-service gratuity for Qatar, Kuwait, Bahrain and Oman, each under its own Labour Law article. Web page: https://calcbright.com/gcc-gratuity-calculator | Read-only |
| gosi_calculator | SAR 12,500 basic + housing costs a Saudi SAR 1,218.75 a month in GOSI (9.75%). See the July 2026 new-entrant rate, the 2% for expats and the SAR 45,000 cap. Web page: https://calcbright.com/gosi-calculator | Read-only |
| gpa_calculator | Letter grades A to F with plus and minus, weighted by credit hours, for up to 8 courses. Get this term’s GPA on the 4.0 scale and your new cumulative GPA. Web page: https://calcbright.com/gpa-calculator | Read-only |
| grade_calculator | At 88% with a final worth 25%, you need 96% on the final to finish with an A. Enter your grade, the exam weight and your target to see the score you need. Web page: https://calcbright.com/grade-calculator | Read-only |
| gravel_calculator | A 10 × 10 ft bed 3 in deep takes 0.93 cubic yards of gravel – about 1.31 tons. Size gravel, stone, sand, topsoil or mulch orders in yards, m³, tons or bags. Web page: https://calcbright.com/gravel-calculator | Read-only |
| gst_calculator | Add or remove GST at the slabs in force since September 2025 (5%, 18%, 40%) or legacy 12% and 28%, split as CGST + SGST locally or IGST inter-state. Web page: https://calcbright.com/gst-calculator | Read-only |
| heart_rate_zone_calculator | Zone 2 for a 30-year-old is 114–133 bpm by 220 − age. Get all five training zones from your age, using 220 − age or Tanaka, or personalise them with resting HR. Web page: https://calcbright.com/heart-rate-zone-calculator | Read-only |
| height_converter | Convert cm to feet and inches, or feet and inches to cm, using the exact 2.54 cm inch: 175 cm is 5 ft 8.9 in. Includes a height chart from 150 cm to 200 cm. Web page: https://calcbright.com/height-converter | Read-only |
| heloc_calculator | Your HELOC limit is home value × CLTV minus the mortgage. See that limit, the interest-only draw payment and the jump when the repayment period begins. Web page: https://calcbright.com/heloc-calculator | Read-only |
| hijri_date_converter | 1 Ramadan 1448 AH is Monday, 8 February 2027. Convert dates Hijri ↔ Gregorian on Saudi Arabia’s official Umm al-Qura calendar, with the weekday and Eid dates. Web page: https://calcbright.com/hijri-date-converter | Read-only |
| holiday_entitlement_calculator | UK holiday entitlement calculator: statutory 5.6 weeks (max 28 days), pro-rata for part-time days or hours, starters and leavers, and 12.07% irregular hours. Web page: https://calcbright.com/holiday-entitlement-calculator | Read-only |
| home_affordability_calculator | On $100,000 a year the 28/36 rule caps housing at $2,333 a month. This home affordability calculator turns that cap, your debts and down payment into a price. Web page: https://calcbright.com/home-affordability-calculator | Read-only |
| hours_calculator | An hours calculator laid out as a weekly time card: start, end and unpaid break per day, totalled as h:mm and decimal hours, with hours over 40 flagged. Web page: https://calcbright.com/hours-calculator | Read-only |
| ideal_weight_calculator | At 175 cm, the Devine formula puts a man’s ideal weight at 70.5 kg. Compare Robinson, Miller, Devine and Hamwi with the healthy BMI range for your height. Web page: https://calcbright.com/ideal-weight-calculator | Read-only |
| income_tax_calculator | $100,000 single owes $13,170 in 2026 federal tax – 13.17%, not 22%. IRS brackets, $16,100 standard deduction, $2,200 child credit and the 65+ deductions. Web page: https://calcbright.com/income-tax-calculator | Read-only |
| inflation_calculator | At 3% a year, $100 of shopping costs $134.39 in a decade. This inflation calculator projects future prices or past values using the latest official CPI rate. Web page: https://calcbright.com/inflation-calculator | Read-only |
| interest_only_mortgage_calculator | A $300,000 loan at 6.5% costs $1,625 a month interest-only, then $2,236.72 once repayment starts. Compare it with a standard mortgage and see the extra interest. Web page: https://calcbright.com/interest-only-mortgage-calculator | Read-only |
| ip_subnet_calculator | Paste 192.168.1.10/24 or any IPv4 CIDR to get the network, broadcast, usable host range, subnet and wildcard masks in binary – then split it into equal subnets. Web page: https://calcbright.com/ip-subnet-calculator | Read-only |
| jordan_end_of_service_calculator | JOD 600 a month for 7 years outside social security earns a JOD 4,200 end-of-service bonus in Jordan (Labour Law Art. 32) – even if you resign. Web page: https://calcbright.com/jordan-end-of-service-calculator | Read-only |
| jordan_social_security_calculator | 7.5% from you, 14.25% from your employer: a JOD 800 wage costs JOD 60 + JOD 114 a month. 2026 SSC ceiling: JOD 3,733 (JOD 5,000 if covered before May 2010). Web page: https://calcbright.com/jordan-social-security-calculator | Read-only |
| land_transfer_tax_calculator | A $700,000 Ontario home owes $10,475 in land transfer tax – double in Toronto. 2026 rates for every province, BC PTT, Quebec welcome tax and buyer rebates. Web page: https://calcbright.com/land-transfer-tax-calculator | Read-only |
| lcm_gcd_calculator | For 12, 18 and 30 the GCD is 6 and the LCM is 180. Get both for up to 20 whole numbers, with each prime factorization shown – GCF and HCF are the same thing. Web page: https://calcbright.com/lcm-gcd-calculator | Read-only |
| lean_body_mass_calculator | A 70 kg, 175 cm man has about 56 kg of lean mass by the Boer formula. Enter your height, weight and sex to estimate lean and fat mass in kg or pounds. Web page: https://calcbright.com/lean-body-mass-calculator | Read-only |
| loan_calculator | AED 100,000 at 3.99% flat over 4 years is AED 2,415.83 a month – really 7.46% reducing. Get the EMI, interest and schedule, with UAE and Saudi limits. Web page: https://calcbright.com/loan-calculator | Read-only |
| loan_to_value_calculator | A $240,000 loan on a $300,000 home is an 80% LTV. Enter your balance and property value to see your ratio, equity and the paydown needed to reach 80%. Web page: https://calcbright.com/loan-to-value-calculator | Read-only |
| logarithm_calculator | Log calculator for common log (base 10), natural log (ln), log base 2 or any custom base like log₃(81) = 4, with the change-of-base division written out. Web page: https://calcbright.com/logarithm-calculator | Read-only |
| macro_calculator | Protein and carbs have 4 kcal per gram, fat 9. Turn your Mifflin–St Jeor calorie target into daily grams for fat loss, maintenance or gain in three splits. Web page: https://calcbright.com/macro-calculator | Read-only |
| markup_calculator | A 50% markup on a $40 cost sells at $60 – only a 33.33% margin. Set a markup on cost to see the selling price, profit per unit and the true gross margin. Web page: https://calcbright.com/markup-calculator | Read-only |
| morocco_severance_calculator | MAD 8,000 a month for 10 years earns MAD 50,261.78 severance in Morocco (Labour Code Art. 53) – plus notice pay, and court damages if the dismissal is abusive. Web page: https://calcbright.com/morocco-severance-calculator | Read-only |
| mortgage_calculator | $400,000 home, 20% down at 7.32%: $2,198.18 a month before tax and insurance. Add escrow, PMI and extra payments, and see when PMI can be cancelled. Web page: https://calcbright.com/mortgage-calculator | Read-only |
| mortgage_payoff_calculator | $200 a month extra on a $250,000, 6.5% loan saves $64,927 and 5½ years. Model extra payments, a lump sum or biweekly in this mortgage payoff calculator. Web page: https://calcbright.com/mortgage-payoff-calculator | Read-only |
| number_base_converter | Decimal 255 is 11111111 in binary, 377 in octal and FF in hex. Convert between any bases from 2 to 36, paste 0x or 0b values, and handle 64-bit+ integers. Web page: https://calcbright.com/number-base-converter | Read-only |
| number_to_words_converter | Writing a check? Get the amount line in words, such as “and 45/100 dollars”, or spell out any number up to 999 trillion – including Indian lakh and crore. Web page: https://calcbright.com/number-to-words-converter | Read-only |
| ohms_law_calculator | Enter any two of volts, amps, ohms and watts to get the other two. Also converts watts to amps for DC, single-phase and three-phase AC with power factor. Web page: https://calcbright.com/ohms-law-calculator | Read-only |
| one_rep_max_calculator | Estimate your bench, squat or deadlift max from a submaximal set: Epley, Brzycki and Lombardi 1RM side by side, plus a % of 1RM table for programming. Web page: https://calcbright.com/one-rep-max-calculator | Read-only |
| overtime_calculator | Saudi overtime on SAR 6,000 basic plus SAR 3,000 allowances is SAR 50 an hour, not SAR 37.50. Get UAE, Saudi and US overtime pay from your real salary. Web page: https://calcbright.com/overtime-calculator | Read-only |
| ovulation_calculator | Pinpoint your likely ovulation day and six-day fertile window from your last period and cycle length, with the dates mapped out for your next four cycles. Web page: https://calcbright.com/ovulation-calculator | Read-only |
| p_value_calculator | Turn a z, t, chi-square or F statistic into a left-, right- or two-tailed p-value, with critical values and whether it is significant at 0.05 and 0.01. Web page: https://calcbright.com/p-value-calculator | Read-only |
| pace_calculator | 10 km in 50 minutes is 5:00 per km or 8:03 per mile. Get running pace and speed from any distance and time, or your finish time for a 5K to a marathon. Web page: https://calcbright.com/pace-calculator | Read-only |
| paint_calculator | A 12 × 12 ft room needs about 2 gallons for two coats. Enter room size, doors, windows and coats to get the wall area and the gallons or liters to buy. Web page: https://calcbright.com/paint-calculator | Read-only |
| password_generator | Make a random 8–64 character password from letters, digits and symbols and see its entropy in bits. Created on your device with crypto.getRandomValues. Web page: https://calcbright.com/password-generator | Read-only |
| pay_raise_calculator | A 5% pay raise on $60,000 is $63,000 – only 1.25% more after 3.7% US inflation. See a raise per year, month and hour, what it is worth net and in the Gulf. Web page: https://calcbright.com/pay-raise-calculator | Read-only |
| percent_error_calculator | Measured 9.6 when the accepted value is 9.81? That is a 2.14% error. Get percent, absolute, relative and signed error for lab reports and experiments. Web page: https://calcbright.com/percent-error-calculator | Read-only |
| percentage_calculator | What is 15% of 200? What percent is 30 of 200? Solve percent-of, percentage change, increase and decrease questions, with the working shown for each step. Web page: https://calcbright.com/percentage-calculator | Read-only |
| percentage_change_calculator | 80 to 100 is a 25% increase but only a 22.22% difference. Get percent change, the percentage difference, or reverse a % change back to the original value. Web page: https://calcbright.com/percentage-change-calculator | Read-only |
| period_calculator | Predict your next six periods from the date your last one started and your cycle length, with ovulation days and fertile windows on the same calendar. Web page: https://calcbright.com/period-calculator | Read-only |
| permutation_combination_calculator | Choosing 3 from 10 items gives 720 ordered arrangements (nPr) or 120 combinations (nCr). Get both, plus repetition cases and n factorial, with exact big numbers. Web page: https://calcbright.com/permutation-combination-calculator | Read-only |
| pregnancy_due_date_calculator | Your due date is 280 days from your last period, adjusted here for cycle length. Also works from a conception or IVF transfer date, with weeks pregnant today. Web page: https://calcbright.com/pregnancy-due-date-calculator | Read-only |
| prime_number_checker | Is 91 prime? No – it is 7 × 13. Test any whole number up to one trillion, see its smallest factor and prime factorization, and find the nearest primes. Web page: https://calcbright.com/prime-number-checker | Read-only |
| profit_margin_calculator | $60 cost and a $100 price is a 40% profit margin but a 66.67% markup. Enter cost and revenue for gross profit, margin and markup, and prices for target margins. Web page: https://calcbright.com/profit-margin-calculator | Read-only |
| prorated_rent_calculator | Moving in on 11 March with $1,500 rent costs $1,016.13 for the first month. Enter the rent and your move date to get the exact partial-month charge. Web page: https://calcbright.com/prorated-rent-calculator | Read-only |
| protein_calculator | How many grams of protein a day? From the 0.8 g/kg RDA to 2.2 g/kg for muscle gain, see your daily range for your body weight and activity or training goal. Web page: https://calcbright.com/protein-calculator | Read-only |
| pythagorean_theorem_calculator | Legs of 3 and 4 give a hypotenuse of 5. Solve a² + b² = c² for any side of a right triangle, with exact radicals like 5√2, the angles, area and full working. Web page: https://calcbright.com/pythagorean-theorem-calculator | Read-only |
| quadratic_equation_solver | Solve ax² + bx + c = 0 with the quadratic formula: the discriminant, real or complex roots and the vertex of the parabola, with every step written out. Web page: https://calcbright.com/quadratic-equation-solver | Read-only |
| ramadan_countdown_calculator | Ramadan 2027 (1448 AH) is expected on Monday 8 February on the Umm al-Qura calendar. Live count of the days to Ramadan, Eid al-Fitr and Eid al-Adha. Web page: https://calcbright.com/ramadan-countdown-calculator | Read-only |
| random_number_generator | Draw one number or up to 1,000 from any range – whole or decimal, with or without repeats. Useful for raffles, lottery picks, dice rolls and classroom draws. Web page: https://calcbright.com/random-number-generator | Read-only |
| ratio_calculator | Solve A:B = C:D for the missing value or reduce a ratio to lowest terms – 1920:1080 becomes 16:9. Handy for recipes, screen sizes, map scales and mixes. Web page: https://calcbright.com/ratio-calculator | Read-only |
| redundancy_pay_calculator | 10 years’ service at age 45 on £800 a week pays £9,012 in 2026/27. Statutory redundancy pay with the age bands, 20-year limit and £751 cap (£783 in NI). Web page: https://calcbright.com/redundancy-pay-calculator | Read-only |
| refinance_calculator | Will a lower rate pay off? This refinance calculator compares your current and new mortgage payments, finds the break-even month and the lifetime interest. Web page: https://calcbright.com/refinance-calculator | Read-only |
| rent_affordability_calculator | A $60,000 salary supports about $1,500 rent. This rent affordability calculator applies the 30% rule, the landlord 40x test and your monthly debts. Web page: https://calcbright.com/rent-affordability-calculator | Read-only |
| rent_vs_buy_calculator | This rent vs buy calculator weighs the true cost of owning – interest, tax, upkeep, lost returns and equity – against renting, to find the break-even year. Web page: https://calcbright.com/rent-vs-buy-calculator | Read-only |
| retirement_calculator | $800 a month from age 35 at 7% grows to about $1.38 million by 65. This retirement calculator projects your nest egg and how long withdrawals will last. Web page: https://calcbright.com/retirement-calculator | Read-only |
| roi_calculator | Turning $10,000 into $15,000 is a 50% return, or 14.47% a year over 3 years. This ROI calculator shows total ROI, net profit and the annualized rate. Web page: https://calcbright.com/roi-calculator | Read-only |
| roman_numeral_converter | MCMXCIX is 1999 and 2026 is MMXXVI. Convert any number from 1 to 3999 into Roman numerals, or decode a numeral back to a number, with each symbol explained. Web page: https://calcbright.com/roman-numeral-converter | Read-only |
| roth_ira_calculator | Check the 2026 Roth IRA limit ($7,500, or $8,600 at 50+) and the income phase-out for your MAGI, then project your tax-free balance against a taxable account. Web page: https://calcbright.com/roth-ira-calculator | Read-only |
| rrsp_calculator | New 2026 RRSP room is 18% of 2025 earned income, up to $33,810. See your room, the tax refund a contribution earns in your province and growth to retirement. Web page: https://calcbright.com/rrsp-calculator | Read-only |
| rule_of_72_calculator | At 8% a year, money doubles in 72 ÷ 8 = 9 years. Enter any rate to compare the Rule of 72, the Rule of 69.3 and the exact compound-growth answer. Web page: https://calcbright.com/rule-of-72-calculator | Read-only |
| salary_calculator | $25 an hour is $52,000 a year; AED 6,000 a month is AED 200 a day under Gulf labour rules. Convert pay between hourly, daily, weekly, monthly and annual. Web page: https://calcbright.com/salary-calculator | Read-only |
| sales_tax_calculator | Add sales tax to a price or pull it out of a receipt: $127.50 at 6.25% is $120 before tax. Works with any combined state, county and city sales tax rate. Web page: https://calcbright.com/sales-tax-calculator | Read-only |
| sample_size_calculator | 385 responses give ±5% at 95% confidence. Get the survey sample size for any confidence level, margin of error and proportion, with small-population correction. Web page: https://calcbright.com/sample-size-calculator | Read-only |
| saudi_end_of_service_calculator | SAR 12,000 a month for 7 years earns SAR 54,000 – or SAR 36,000 if you resign. Saudi end-of-service award under Labour Law Articles 84–85, part-years included. Web page: https://calcbright.com/saudi-end-of-service-calculator | Read-only |
| savings_goal_calculator | Need $50,000 in 5 years? This savings goal calculator shows the monthly deposit to hit any target by your deadline, counting current savings and interest. Web page: https://calcbright.com/savings-goal-calculator | Read-only |
| scientific_calculator | Type 2^10 + √144 × sin(30) the way you would write it and get each step back. Handles powers, roots, trig, logs, factorials, nCr and π in degrees or radians. Web page: https://calcbright.com/scientific-calculator | Read-only |
| scientific_notation_converter | 299,792,458 is 2.99792458 × 10⁸. Convert any number to scientific, E- or engineering notation and back to standard form, digit-exact even at 10⁻³⁰⁰. Web page: https://calcbright.com/scientific-notation-converter | Read-only |
| self_employment_tax_calculator | 1099 income? See the 15.3% SE tax on 92.35% of your profit, the half-SE deduction, 2026 federal income tax and what each quarterly estimated payment should be. Web page: https://calcbright.com/self-employment-tax-calculator | Read-only |
| shoe_size_converter | A US men's 9 is a UK 8.5, an EU 42.5 and 27 cm. Convert adult shoe sizes between US men's, US women's, UK, EU and Japanese cm before you order from abroad. Web page: https://calcbright.com/shoe-size-converter | Read-only |
| significant_figures_calculator | Does 0.004050 have 3 or 4 sig figs? Paste any number to see which digits are significant and the rule behind each one, then round it to as many as you need. Web page: https://calcbright.com/significant-figures-calculator | Read-only |
| simple_interest_calculator | $10,000 at 5% for 3 years earns $1,500. This simple interest calculator applies I = P × r × t with the term in years, months or days and shows the total due. Web page: https://calcbright.com/simple-interest-calculator | Read-only |
| sip_calculator | ₹10,000 a month for 10 years at 12% grows to ₹23,23,391 – ₹21,92,969 after tax on an equity fund. SIP calculator with annual step-up, for residents and NRIs. Web page: https://calcbright.com/sip-calculator | Read-only |
| sleep_calculator | Up at 7:00 AM? Aim for bed at 9:45 or 11:15 PM. Count back whole 90-minute sleep cycles to pick a bedtime or alarm that lands in light sleep, not deep sleep. Web page: https://calcbright.com/sleep-calculator | Read-only |
| slope_calculator | Two points in, the whole line out: slope as a fraction, y = mx + b, point-slope and standard form, the angle, distance and midpoint, each with its working. Web page: https://calcbright.com/slope-calculator | Read-only |
| social_security_calculator | Claim at 62 and get 70% of your benefit; wait until 70 and get 124%. Estimate your PIA with the 2026 bend points and compare every claiming age from 62 to 70. Web page: https://calcbright.com/social-security-calculator | Read-only |
| speed_distance_time_calculator | 150 km in 2 h 30 min is 60 km/h. Give any two of speed, distance and time to get the third, mixing km, miles, km/h and mph freely, with the working shown. Web page: https://calcbright.com/speed-distance-time-calculator | Read-only |
| square_footage_calculator | A 12 × 15 ft room is 180 sq ft. Measure rectangles, L-shaped rooms, circles or triangles and get sq ft, m², square yards, acres and the cost at your price. Web page: https://calcbright.com/square-footage-calculator | Read-only |
| square_root_calculator | √72 simplifies to 6√2 ≈ 8.4852813742. Get square, cube or any nth root to 10 decimal places, the simplest radical form and a check that squares back. Web page: https://calcbright.com/square-root-calculator | Read-only |
| stamp_duty_calculator | A £350,000 home in England costs £7,500 in stamp duty – or £14,500 if you live abroad. SDLT, LBTT and LTT with first-time, second-home and non-resident rates. Web page: https://calcbright.com/stamp-duty-calculator | Read-only |
| standard_deviation_calculator | Sample (n − 1) or population (N)? Paste your data and get both standard deviations, the variance and mean, with a deviation-by-deviation table you can check. Web page: https://calcbright.com/standard-deviation-calculator | Read-only |
| student_loan_repayment_calculator | UK student loan repayment calculator for 2026/27: monthly repayments on Plans 1, 2, 4, 5 and Postgraduate, interest, years to repay and write-off. Web page: https://calcbright.com/student-loan-repayment-calculator | Read-only |
| take_home_pay_calculator | $75,000 in Texas leaves $61,592.50 after 2026 federal tax and FICA; £50,000 in England £39,519.60. Net pay in 166 countries, the Gulf included, line by line. Web page: https://calcbright.com/take-home-pay-calculator | Read-only |
| tax_free_salary_equivalent_calculator | AED 25,000 a month tax-free needs $103,565 gross in Texas or $111,183 in Illinois. See the pay that matches a Gulf salary in the US, UK or Canada. Web page: https://calcbright.com/tax-free-salary-equivalent-calculator | Read-only |
| tdee_calculator | Your maintenance calories are BMR × an activity factor. Get yours with Mifflin–St Jeor or Katch–McArdle, plus daily targets to lose or gain 0.25–1 kg a week. Web page: https://calcbright.com/tdee-calculator | Read-only |
| tfsa_calculator | Eligible since 2009? Your TFSA limit is $109,000 in 2026. Subtract what you put in, add back past withdrawals, and see your room and how the account could grow. Web page: https://calcbright.com/tfsa-calculator | Read-only |
| time_duration_calculator | 9:15 AM to 5:45 PM is 8 h 30 min, or 8.5 hours. Get the time between any two clock times, overnight shifts included, in hours and minutes, decimal and minutes. Web page: https://calcbright.com/time-duration-calculator | Read-only |
| time_to_decimal_converter | 2 h 45 min is 2.75 hours, not 2.45. Turn hours, minutes and seconds into decimal hours for timesheets and payroll, or turn 7.8 h back into 7 h 48 min. Web page: https://calcbright.com/time-to-decimal-converter | Read-only |
| time_zone_converter | 9:00 AM in New York is 2:00 PM in London in summer. Convert any date and time between two cities with daylight saving applied for that date, plus a world clock. Web page: https://calcbright.com/time-zone-converter | Read-only |
| tip_calculator | An 18% tip on $84 is $15.12. Enter the bill, pick a percentage and split the total between any number of people, with 10% to 25% tips compared side by side. Web page: https://calcbright.com/tip-calculator | Read-only |
| triangle_calculator | Know three parts of a triangle? Get the other three, plus area, perimeter, type and a scale drawing. SSS, SAS, ASA, AAS and the SSA ambiguous case all work. Web page: https://calcbright.com/triangle-calculator | Read-only |
| uae_corporate_tax_calculator | AED 1 million of taxable income owes AED 56,250 in UAE corporate tax (5.63%). Covers the 0%/9% bands, Small Business Relief to 2029 and free zone 0%. Web page: https://calcbright.com/uae-corporate-tax-calculator | Read-only |
| uae_gratuity_calculator | AED 10,000 basic for 7 years earns AED 55,000 in gratuity. Check your UAE end-of-service benefit: 21 days’ pay a year for 5 years, then 30, under the 2021 law. Web page: https://calcbright.com/uae-gratuity-calculator | Read-only |
| unit_converter | Convert cm to inches, kg to lbs, °C to °F and more in 18 categories, from length and weight to torque, flow rate and density, using exact conversion factors. Web page: https://calcbright.com/unit-converter | Read-only |
| unit_price_calculator | A 500 g pack at $3.99 costs $0.80 per 100 g, so a 1 kg pack at $7.20 ($0.72) is the better buy. Compare up to three sizes in mixed units to find the lowest price. Web page: https://calcbright.com/unit-price-calculator | Read-only |
| unix_timestamp_converter | 1700000000 is 2023-11-14T22:13:20Z. Paste an epoch value in seconds or milliseconds to get a readable UTC and ISO 8601 date, or turn a date into a timestamp. Web page: https://calcbright.com/unix-timestamp-converter | Read-only |
| vat_calculator | £120 with 20% VAT is £100 net: divide by 1.2, never take 20% off. Add or remove VAT at UK 20%, UAE 5%, Saudi 15% or any rate in 177 countries. Web page: https://calcbright.com/vat-calculator | Read-only |
| volume_calculator | A 30 × 20 × 10 cm box holds exactly 6 litres. Get the volume of a cube, box, cylinder, sphere, cone or pyramid with its formula, in litres and gallons too. Web page: https://calcbright.com/volume-calculator | Read-only |
| waist_to_hip_ratio_calculator | A waist of 86 cm over hips of 100 cm gives a WHR of 0.86. Enter your measurements in cm or inches and compare with the WHO thresholds of 0.90 and 0.85. Web page: https://calcbright.com/waist-to-hip-ratio-calculator | Read-only |
| water_intake_calculator | A 70 kg adult who exercises 30 minutes a day needs about 2.8 L of water. Get your own daily target in litres, cups and ounces from weight, exercise and climate. Web page: https://calcbright.com/water-intake-calculator | Read-only |
| week_number_calculator | January 1, 2026 is in ISO week 1, which began on December 29, 2025. Get the week number of any date, its Monday and Sunday, the day of the year and days left. Web page: https://calcbright.com/week-number-calculator | Read-only |
| weighted_average_calculator | Scores of 85, 90 and 78 weighted 30%, 20% and 50% average 82.5, not 84.3. Enter up to six values with their weights and see the working and the simple average. Web page: https://calcbright.com/weighted-average-calculator | Read-only |
| word_counter | A 1,000-word article takes about 4 min 12 sec to read. Paste text for words, characters with and without spaces, sentences, speaking time and top keywords. Web page: https://calcbright.com/word-counter | Read-only |
| z_score_calculator | Scored 85 with a mean of 70 and SD of 10? That is z = 1.5, the 93.32nd percentile. Get z-scores, tail probabilities or the value for any percentile. Web page: https://calcbright.com/z-score-calculator | Read-only |
| zakat_calculator | AED 63,000 of savings, gold and shares owes AED 1,575 in zakat. Check today’s gold or silver nisab live in your currency, with 85 g or 87.48 g weights. Web page: https://calcbright.com/zakat-calculator | Read-only |
| Directory | Listing | Tier | First seen |
|---|---|---|---|
| Official MCP Registry | CalcBright Calculators | - | 12 Oct 2026 |