Calculators

Calculate your Body Mass Index from height and weight, with a category. Free, in your browser, no sign-up.

Calculate break-even ROAS, max ad spend, and max CAC from one order economics.

Work out what one number is as a percentage of another, and percentage amounts. Free, in your browser, no sign-up.

Project how your 401(k) grows from your balance, contributions, and return rate. Free, in your browser, no sign-up.

Astable frequency and duty cycle from R1, R2, C. Free, instant, in your browser.

Acres and hectares of a plot. Free, instant, in your browser.

Adjusted and ideal body weight for dosing. Free, instant, in your browser.

Find an exact age in years, months, and days plus totals and a birthday countdown. Free, in your browser, nothing is uploaded.

Watts from amps and volts, DC or AC. Free, instant, in your browser.

Calculate the regular payout a lump sum can provide over a set period at a given interest rate. Free, in your browser, no sign-up.

Work out the regular income a lump sum can pay out over a fixed number of years at a given return, monthly, quarterly or yearly. Free, in your browser, no sign-up.

Antilog in base 10, e or 2. Free, instant, in your browser.

Calculate a loan’s APR including upfront fees, the monthly payment, and the total finance charge. Free, in your browser, no sign-up.

Convert an annual percentage rate (APR) into the annual percentage yield (APY) for daily, monthly, quarterly or yearly compounding. Free, in your browser, no sign-up.

Convert an interest rate (APR) to the annual percentage yield for any compounding, or an APY back to its APR. Free, in your browser, no sign-up.

Convert an annual percentage yield (APY) back into the nominal annual rate (APR) for a given compounding frequency. Free, in your browser, no sign-up.

Area from radius, diameter or circumference. Free, instant, in your browser.

Army one-site tape test (AD 2023-11). Free, instant, in your browser.

Get the mean, median, mode and more from a list of numbers. Free, in your browser, nothing is uploaded.

Estimate blood alcohol content from standard drinks, body weight, sex and time with the Widmark formula, plus roughly how long until it is back to zero. Free, in your browser, no sign-up.

Calculate the monthly payment on a balloon loan and the lump sum still owed when the balloon comes due. Free, in your browser, no sign-up.

Enter a bench press weight and the reps you got with it to estimate your bench 1RM, plus a training percentage chart.

Add, subtract, multiply, divide and AND/OR/XOR binary numbers. Free, in your browser.

Estimate your Basal Metabolic Rate, the calories your body burns at rest. Free, in your browser, no sign-up.