Converters calculators
10 free tools
Switch between units without hunting for the conversion factor — length, weight, and temperature, metric and imperial, updated the moment you type.
Convert square meters, square feet, acres, hectares, and square miles in one grid.
Convert bytes, KB, MB, GB, TB, and bits using binary 1024 steps in one view.
Convert joules, kilojoules, calories, kilocalories, watt-hours, and kWh at a glance.
Convert between meters, feet, inches, miles, and other length units.
Convert pascals, kilopascals, bar, psi, and atmospheres — enter one value, see them all.
Convert m/s, km/h, mph, knots, and ft/s — type one value and read every unit at once.
Convert between Celsius, Fahrenheit, and Kelvin instantly.
Convert seconds, minutes, hours, days, weeks, and milliseconds from a single value.
Convert liters, milliliters, US gallons, quarts, pints, cups, and fluid ounces instantly.
Convert between kilograms, pounds, ounces, grams, and more.
Frequently asked questions
Do these converters handle both metric and imperial?
Yes. Each one lists metric and imperial units side by side, so you can go from meters to feet, kilograms to pounds, or Celsius to Fahrenheit without a second thought.
How accurate are the conversions?
They use exact standard factors — one inch is precisely 25.4 millimeters, one pound is 453.59237 grams — so what you see is as accurate as the number you type, rounded only for display.
Do I have to pick a 'to' unit?
No. Enter a value and its unit and every other unit updates at once in the grid below, so you get the whole conversion table in one glance.