Skip to content

Free online calculators

Quick answers for everyday numbers

Loans, health, math, dates and unit conversions. Clear formulas, instant results, and nothing you type ever leaves your browser.

Popular: Mortgage BMI Percentage Age Tip
43free tools
6categories
0sign-ups

The calculators people reach for most.

Mortgage Calculator

Estimate your monthly mortgage payment including principal, interest, property tax, home insurance and HOA fees, with a yearly amortization table.

BMI Calculator

Work out your body mass index from your weight and height, see the WHO weight category it falls into and the healthy weight range for your height.

Percentage Calculator

Find a percentage of a number, what percent one number is of another, and the percentage change between two values.

Age Calculator

Work out an exact age in years, months and days from a date of birth, plus total months, weeks and days and the countdown to the next birthday.

Length Converter

Convert lengths and distances between millimeters, centimeters, meters, kilometers, inches, feet, yards, miles and nautical miles, and see the value in every unit at once.

Tip Calculator

Work out the tip and total for a bill, split it between any number of people, and optionally round each share up to a whole amount.

Browse by category

Every tool is free and runs privately in your browser.

Finance

10 tools

All finance tools →
All health & fitness tools →

Math

8 tools

All math tools →

Date & Time

6 tools

All date & time tools →

Converters

6 tools

All converters tools →

Everyday

5 tools

All everyday tools →

From the blog

Plain-language guides to the numbers behind the tools.

All articles →

How Loan Amortization Works

A plain-English guide to how each monthly loan payment is split between interest and principal, and why the balance falls slowly at first.