Unit Converter

Everyday · Free, no account

Convert units, with every unit at once.

Type a number and see it in every unit of length, weight, temperature, volume, area, speed or data. Free, with no account and no ads.

Runs on this device. Nothing is uploaded.

Convert

To

0.621371 miles

Rounded to 6 digits

mi = km ÷ 1.609344. A mile is exactly 1.609344 km.

Pinned

1 km is also

Tap one to make it the answer.

Metric

US and imperial

At sea and in the air

Good to know

An inch is exactly 2.54 cm and a foot exactly 30.48 cm, by international agreement since 1959. The old US survey foot was retired at the end of 2022.

Questions

Questions people ask.

Short answers, in plain words. Something missing? Ask Support and we’ll add it here.

Is this unit converter free?
Yes. It runs in your browser, with no account, no ads and no limit. The Unit Converter app, which installs to your home screen and keeps your pinned pairs on every device, comes with an implements subscription.
Is anything I type sent anywhere?
No. Every conversion is worked out on this device. Your last units and pinned pairs are kept in this browser, so it opens where you left off, and nothing is sent to us.
How accurate is it?
It uses the exact legal definitions, like 1 inch = 2.54 cm and 1 pound = 0.45359237 kg. Answers are rounded to 6 significant digits, or 4 or 10 if you prefer, and an answer that is exact, like 1 mile = 1.609344 km, always shows in full.
Can I type fractions?
Yes: 1 1/2, 3/4, and sums like 2+3. For lengths, 5’11” means 5 feet 11 inches. Inches can also show as fractions, to the nearest 1/16 or whatever you pick.
Does it tell US and UK units apart?
Yes. US and UK pints, gallons and fluid ounces are listed separately, and so are the US cup, the nutrition label cup and the metric cup.
Which units does it cover?
Length from millimeters to nautical miles, mass from milligrams to US tons, Celsius, Fahrenheit and Kelvin, volume from teaspoons to cubic meters, area from square centimeters to square miles, speed including knots, and data from bits to tebibytes.
Does it convert currency?
No. Exchange rates change by the minute, so a converter that works everything out on your device can’t know them.

Updated

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