204 calculators · grouped by category
Health Calculators
Fitness, BMI, Calories and more
Anorexic BMI Calculator
Screen BMI against the tiers used when assessing anorexia nervosa in adults.
CalculateArmy Body Fat Calculator
One-site U.S. Army tape test (2023) with the age/gender max body fat standards.
CalculateBAC Calculator
Estimated blood alcohol concentration via Widmark with time decay and limits.
CalculateBMI Calculator
Calculate Body Mass Index, weight category and healthy weight range for your height.
CalculateBMR Calculator
Basal metabolic rate via Mifflin-St Jeor with Harris-Benedict and a TDEE table.
CalculateBody Fat Calculator
Estimate body fat % with the U.S. Navy tape method plus the BMI-based fallback.
CalculateBody Surface Area Calculator
Compute body surface area (BSA) with Mosteller plus seven other published formulas.
CalculateBody Type Calculator
Classify body shape from bust/waist/hip measurements and compute waist-hip ratio.
CalculateFinance Calculators
Loans, EMI, Interest and more
401k Calculator
Project your 401(k) balance at retirement with employer match, raises and growth.
CalculateAmortization Calculator
Loan payment with a full amortization schedule and optional extra payments.
CalculateAnnuity Calculator
Growth of an annuity during accumulation with annual or monthly deposits.
CalculateAnnuity Payout Calculator
Compute annuity withdrawals for a fixed period, or how long a fixed payment lasts.
CalculateAPR Calculator
Reveal the real APR of a loan once upfront fees and points are included.
CalculateAuto Lease Calculator
Estimate monthly car lease payments from price, money factor, residual and tax.
CalculateAuto Loan Calculator
Compute car loan payments, total interest and payoff schedule with trade-in and sales tax.
CalculateAverage Return Calculator
Money-weighted average return from cash flows, or averaged returns over periods.
CalculateEducation Calculators
GPA, Grades, CGPA and more
College Cost Calculator
Project future college costs with inflation and size the monthly savings needed to cover them.
CalculateFraction Calculator
Add, subtract, multiply or divide two fractions; result simplified with mixed number.
CalculateGPA Calculator
Compute your weighted GPA from courses, credits and letter grades on the 4.0 scale.
CalculateGrade Calculator
Find the score you need on your final exam to reach a target course grade.
CalculateLong Division Calculator
Long division with full working: quotient, remainder and 12 decimal places.
CalculateNumber Sequence Calculator
Detect arithmetic or geometric patterns, extend sequences and find the nth term.
CalculateRoman Numeral Converter
Convert numbers to Roman numerals and back — 1 to 3999 — with validation and the subtractive pairs.
CalculateRounding Calculator
Round to any number of decimals with half-up, floor, ceiling and truncation compared.
CalculateTravel Calculators
Distance, Fuel, Time and more
Currency Converter
Convert between 30+ world currencies with live daily exchange rates from the Frankfurter API.
CalculateFuel Cost Calculator
Trip fuel cost from distance, efficiency and gas price — split between passengers.
CalculateGas Mileage Calculator
Compute your car's real MPG, L/100km and cost per mile from odometer readings and fuel used.
CalculateMileage Calculator
From distance and fuel used, get mpg, L/100 km and the fuel cost per km or mile.
CalculateShoe Size Conversion
Convert foot length or a known size across US Men, US Women, EU and UK — with a full chart.
CalculateSpeed Calculator
Speed from distance and time — in km/h, mph, m/s plus running pace per km/mile.
CalculateTime Zone Calculator
Convert times between world offsets with day-shift notes and a meeting-planner table.
CalculateTire Size Calculator
Compare tire sizes — diameter, sidewall, revs per mile — and the speedometer error when you upsize.
CalculateEveryday Calculators
Daily life calculations
Age Calculator
Calculate exact age in years, months, days — plus weeks, hours, minutes and next birthday.
CalculateArea Calculator
Area of a rectangle, triangle, circle or trapezoid with substituted formulas and steps.
CalculateBasic Calculator
Four-function calculator with power and modulo — add, subtract, multiply, divide, ^, mod.
CalculateBig Number Calculator
Add, subtract, multiply, divide and exponentiate very large numbers, with E-notation support.
CalculateBra Size Calculator
Find your bra size from band and bust measurements in US, UK or EU sizing systems.
CalculateBtu Calculator
Estimate the air-conditioner BTU/h you need for any room based on size, sun and insulation.
CalculateCircle Calculator
From a radius get the diameter, circumference and area of a circle with worked steps.
CalculateCommon Factor Calculator
Find all factors, common factors, GCD and LCM of two integers with Euclid steps.
CalculateBusiness Calculators
Profit, Tax, ROI and more
Business Loan Calculator
Business loan payback with fees — see the true APR behind origination fees and points.
CalculateCommission Calculator
Compute commission from sales price and rate — or back-solve any missing value.
CalculateDepreciation Calculator
Straight-line or double-declining depreciation schedules with year-by-year book values.
CalculateDiscount Calculator
Sale price, savings, and after-tax totals for a percent-off or fixed-amount discount.
CalculateGdp Calculator
Compute GDP via the expenditure or income approach, or deflate nominal GDP to real GDP.
CalculateIRR Calculator
Internal rate of return from an initial investment and yearly cash flows.
CalculateMargin Calculator
Gross margin, markup, and profit from revenue and cost of goods.
CalculatePayback Period Calculator
Compute simple and discounted payback periods for fixed or irregular cash flows, with a cumulative schedule.
CalculateDeveloper Calculators
Unit, base64, JSON and more
Bandwidth Calculator
Estimate download or upload time from file size and connection speed, at any unit.
CalculateBase64 Encode
Encode text to Base64 or decode Base64 back to text — instantly, safely in your browser.
CalculateBinary Calculator
Add, subtract, multiply or divide binary values and convert between base 2, 8, 10 and 16.
CalculateHex Calculator
Hex arithmetic and instant conversion between hexadecimal, decimal, octal and binary.
CalculateIp Subnet Calculator
Split IPv4 networks — network, broadcast, host range, mask, wildcard and usable hosts from any CIDR.
CalculatePassword Generator
Generate strong random passwords with length, character-class and ambiguity controls plus entropy.
CalculateUrl Encode
Percent-encode or decode URLs and query strings instantly, with a length and overhead breakdown.
CalculateStatistics Calculators
Data, Probability and more
Average Calculator
Mean, median, mode and range of any list of numbers — just paste them separated by commas.
CalculateConfidence Interval Calculator
Compute the confidence interval and margin of error for a sample mean at 90/95/99%.
CalculateMean, Median, Mode, Range Calculator
Instantly get mean, median, mode and range of a list of numbers with full steps.
CalculateP-value Calculator
Convert a z-score into one- and two-tailed p-values for hypothesis testing.
CalculatePercent Error Calculator
Measure accuracy: percent error between an experimental value and the true value.
CalculatePermutation AND Combination Calculator
Compute nPr permutations and nCr combinations with factorial working shown.
CalculateProbability Calculator
Coin flips (binomial), dice rolls or a custom favorable/total ratio, with likelihood band.
CalculateSample Size Calculator
How many people to survey? Minimum sample size for a margin of error and confidence.
Calculate