All calculators

Exact age in years, months, and days from a date of birth — using re…

Area of a rectangle, circle, or triangle from the standard formulas …

Convert square meters, square feet, acres, hectares, and square mile…

Monthly car payment from the amount financed — vehicle price with sa…

Body Mass Index — a screening measure of body fat from height and we…

Basal metabolic rate — daily calories burned at complete rest, compu…

US Navy body fat estimate from tape-measure circumferences — height,…

Business days (Mon–Fri) between two dates, counted inclusively — wee…

Daily calorie target for a desired weekly weight loss, using the 3,5…

Future value of an investment with regular monthly contributions — c…

Confidence interval for a mean from sample statistics — a z-interval…

How long until a future event — live days, hours, and minutes from t…

How long a fixed monthly payment takes to clear a balance — credit c…

Convert between 31 world currencies at daily ECB reference rates — m…

Convert bytes, KB, MB, GB, and TB — and the binary units (KiB, MiB, …

How many days, weeks, months, and years between two dates — an exact…

Final price after a percent-off discount, plus exactly what you save…

Estimated due date from your last menstrual period using Naegele's r…

Convert joules, calories, kilocalories (food Calories), watt-hours, …

Compute x^y, logarithms in any base, and nth roots in one place — lo…

What you need to score on the final exam to hit your target grade — …

Add, subtract, multiply, or divide two fractions — the result is red…

Greatest common divisor and least common multiple of two integers — …

Grade point average on the unweighted 4.0 scale from letter grades a…

Training heart rate zones from age and resting heart rate — the Karv…

Hours worked between two clock times, minus unpaid breaks — with dec…

Ideal body weight range from height and sex — the Devine, Robinson, …

Estimated US federal income tax from the 2024 brackets and standard …

What money will cost — or used to be worth — at a given inflation ra…

Convert meters, feet, inches, kilometers, miles, yards, and more usi…

Monthly payment and total interest for any fixed-rate loan from thre…

Daily protein, carb, and fat gram targets from a calorie budget — ba…

Monthly payment, total interest, and amortization for a fixed-rate m…

Estimated ovulation day and fertile window from your last period and…

P-value from a z-score, one- or two-tailed, with a significance verd…

Gross-to-net paycheck estimate for a single filer — 2024 federal bra…

What is X% of Y, Y is what percent of X, and percent change between …

Solve ax² + bx + c = 0 with the quadratic formula — real or complex …

Lifetime savings from refinancing a mortgage — monthly payment diffe…

Compare the cost of renting vs buying a home over your time horizon …

Projected nest egg at retirement age from your current savings, mont…

Return on investment as a total percentage and annualized as CAGR — …

Add sales tax to a pre-tax price to get the out-the-door total — the…

How much you need to save monthly to hit a target — a future-value p…

Evaluate a full expression with trig, logs, powers, roots, and facto…

Interest accrued without compounding — I = P·r·t, so the math is lin…

Convert mph, km/h, meters per second, knots, and Mach — road, runnin…

Mean, median, mode, range, and standard deviation from any list of n…

Estimate the monthly payment, total interest, and payoff time on a s…

Total daily energy expenditure — calories burned including activity,…

Convert between Celsius, Fahrenheit, and Kelvin with the exact formu…

Convert seconds, minutes, hours, days, weeks, months, and years — us…

Convert a clock time between cities worldwide — daylight saving appl…

Calculate the tip on any bill and split the total per person — set a…

Right triangle solver: enter two legs to get the hypotenuse from the…

Volume of a box, sphere, or cylinder from the standard formulas — re…

Convert liters, US gallons, cups, quarts, pints, fluid ounces, and t…

Recommended daily water intake based on weight and activity — 0.5 to…

Convert kilograms, pounds, ounces, grams, stones, and metric tons — …