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Units

Unit converter

Convert length, weight, temperature, volume and more. Exact conversion factors and instant results.

Convert

From

Kilometer (km)

To

0.62137119 mi

Mile (mi) · 1 km = 0.62137119 mi

Quick conversions

Length

Weight

Temperature

Volume

Recent conversions

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Guide

Unit conversion guide

How to convert units

Choose a category, type your value, then pick the unit you have and the unit you want. The result updates as you type. Every unit is defined by an exact value in a base unit, so a conversion is one multiplication and one division.

result = value × (from-unit factor ÷ to-unit factor)

  • 1 in = 2.54 cm
  • 1 mi = 1.609344 km
  • 1 lb = 0.45359237 kg

Example: 5 mi to km: 5 × 1,609.344 m ÷ 1,000 m = 8.04672 km.

Temperature is the exception. The scales start at different points, so it needs an offset as well as a multiplication: °F = °C × 9/5 + 32.

Formulas worth remembering

Know a few of these and you can sanity-check any result.

km → mi: × 0.621371 mi → km: × 1.609344

kg → lb: × 2.20462 lb → kg: × 0.453592

°C → °F: × 9/5 + 32 °F → °C: (°F − 32) × 5/9

L → US gal: × 0.264172 US gal → L: × 3.785412

cm → in: ÷ 2.54 m → ft: × 3.28084

  • Miles to km: multiply by 1.6.
  • kg to lb: double it and add 10 percent.
  • °C to °F: double it and add 30 for a rough answer.

Examples for travelers

Road signs, baggage limits, forecasts and recipes, converted exactly.

  • 65 mph = 104.607 km/h
  • 3 mi = 4.82803 km
  • 23 kg = 50.7063 lb
  • 50 lb = 22.6796 kg
  • 86 °F = 30 °C
  • 12 US fl oz = 354.882 mL
  • A US speed limit of 65 means 65 miles per hour.
  • Body temperature of 98.6 °F is 37 °C, and a comfortable 68 °F room is 20 °C.

Example: A 50 lb baggage limit is 50 × 0.45359237 = 22.68 kg, so check which unit your airline uses before you pack.

Metric vs imperial

Nearly every country uses the metric system. The United States uses US customary units, and the United Kingdom mixes both: miles and mph on the road, metric on most packaging, and stones and pounds for body weight. Aviation uses knots and feet worldwide.

  • 1 US gal = 3.78541 L
  • 1 UK gal = 4.54609 L
  • 1 US ton = 907.185 kg
  • 1 UK long ton = 1,016.05 kg
  • 1 metric tonne = 1,000 kg

The UK gallon is about 20 percent larger than the US gallon, so fuel economy figures are not interchangeable. This tool offers both in Volume, and the word ton can mean three different weights.

Accuracy and rounding

The conversion factors are exact definitions, so the maths is exact; only the display is rounded. Auto shows up to eight significant digits, and the Precision control fixes the number of decimals from 0 to 6.

Round at the end, to the precision of your original measurement

  • Do not round in the middle of a calculation; convert first, then round once.
  • Mach is approximate: this tool uses the speed of sound at sea level in a standard atmosphere (about 1,225 km/h), and the real value changes with temperature.

Example: A trail of “about 5 miles” is 8.04672 km, but 8 km says everything the original did.

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FAQ

Good to know

How do I convert Fahrenheit to Celsius?

Subtract 32, then multiply by 5/9: °C = (°F − 32) × 5/9. For example, 68°F is (68 − 32) × 5/9 = 20°C. To go the other way, multiply by 9/5 and add 32.

How many kilometers are in a mile?

One mile is exactly 1.609344 kilometers, and one kilometer is about 0.621371 miles. A quick mental shortcut is to multiply miles by 1.6.

Are US and UK gallons the same?

No. The US gallon is 3.785 L and the UK imperial gallon is 4.546 L, about 20% larger. Volume offers both, labelled US gallon and UK gallon.

How accurate are unit conversions?

The conversion factors are exact definitions, for example 1 inch = 2.54 cm and 1 lb = 0.45359237 kg, so results are exact apart from display rounding. The one approximate unit is Mach, because the speed of sound changes with temperature.

What is the difference between metric and imperial?

Metric units (meter, gram, liter) scale in powers of ten. Imperial and US customary units (inch, pound, gallon) have historical, irregular ratios such as 12 inches to a foot. Most countries use metric; the US uses customary units and the UK uses a mix.

How many significant digits should I use?

Match the precision of what you measured. For travel, two or three significant digits are plenty: 5 miles is about 8 km. Use the Precision control to fix the number of decimals.

How many pounds are in a kilogram?

One kilogram is about 2.20462 pounds, so a 23 kg suitcase weighs about 50.7 lb. To go back, multiply pounds by 0.453592.

Can I convert negative values?

Yes for temperature, where below-zero readings are normal: −40°C equals −40°F. Length, weight, volume, speed and area don't have negative amounts, so they ask for zero or more.

Are my recent conversions saved?

Only if you tick Remember recent conversions on this device. They are then stored in this browser only, never sent to a server, and you can clear them at any time.