About UnitCheck
UnitCheck converts units and shows its work. Each page gives the converter first, then the formula, a worked example, a chart you can print and the official definition the factor comes from.
A search engine will tell you that 1 inch is 2.54 centimeters. It will not tell you that 10 cm is 3 15/16 inches on a tape measure, that a cup of flour and a cup of sugar weigh different amounts, or which gallon a British recipe means. Those are the questions this site is built for.
Who it is for
- Home cooks and bakers moving between cups, spoons, milliliters and grams.
- DIYers and makers who need inches as fractions, not decimals.
- Students and travelers switching between metric and US or imperial units.
What you will find here
- Length — Millimeters, centimeters, inches, feet, meters and miles, with inch fractions.
- Weight — Grams, kilograms, ounces, pounds, stones and tons.
- Temperature — Celsius, Fahrenheit and kelvin, with an oven temperature chart.
- Volume — Liters, gallons, quarts, pints and cubic units, US and imperial.
- Area — Square feet, square meters, acres and square miles.
- Cooking — Cups, spoons and milliliters, and cups to grams by ingredient.
- Speed — Kilometers per hour, miles per hour, knots and meters per second.
- Energy and power — Joules, calories, watts, kilowatts, torque and voltage.
- Data size — Kilobytes, megabytes and gigabytes, decimal and binary, and pixels to inches.
- Time — Hours, minutes and seconds, decimal hours, time clock and 24-hour time.
How the tools work
Every tool runs in your browser. What you type stays on your device; see how we calculate for the formulas and data behind the results and the editorial policy for how pages are written and updated.
Part of a family of specialist sites
UnitCheck covers one topic on purpose. Other topics live on sister sites that follow the same rules:
- BMI360 — bmi and body-composition calculators
- CalcWorld — math, statistics and science calculators
- FeeCalc — marketplace and payment fee calculators
- RandomVal — randomizers, pickers, wheels and name generators
- Time To Celebrate — countdowns and date calculators
- tools.best — text, developer and everyday utilities