Online Calculators

Calculate age, percentages, tax, BMI, GPA, savings, and more.

All tools

13 tools in this category

Calculate age from a birth date in years, months, weeks, and days. Runs entirely in your browser.

Calculate the time between two dates or two times: years, months, days, hours, and minutes.

Calculate body mass index in metric or imperial units and compare the result with WHO adult categories.

Quickly compute the tip on any bill and split it across multiple people.

Convert length, weight, temperature, volume, area, speed, and time between metric and imperial units.

Find the final price after a discount, calculate savings, and optionally add sales tax.

Calculate a percentage of a number, one value as a percentage of another, or a percentage increase or decrease.

Estimate BMR, TDEE, and daily calorie targets for losing, maintaining, or gaining weight using the Mifflin–St Jeor equation.

Add VAT or sales tax to a net price, or extract it from a gross price, using any rate.

Calculate your weighted grade point average from courses, letter grades, and credit hours on a 4.0 or 5.0 scale. Free and offline.

Find how long to reach a savings goal, or how much to save each month — with optional compound interest. Free, private, offline.

Calculate zakat due on cash, gold, silver, and business assets against the gold or silver nisab. Free, private, offline.

Estimate profit and margin after fees, shipping, and returns.