Convert Units
1 km = 0.6213711922 mi
In every unit
| Millimeters | 1000000 mm |
| Centimeters | 100000 cm |
| Meters | 1000 m |
| Kilometers | 1 km |
| Inches | 39370.07874 in |
| Feet | 3280.839895 ft |
| Yards | 1093.613298 yd |
| Miles | 0.6213711922 mi |
| Nautical miles | 0.5399568035 nmi |
| Micrometers | 1000000000 µm |
Miles to kilometres, pounds to kilograms, Fahrenheit to Celsius, gallons to litres, GB to GiB and more. Enter a value once and see it in every unit of the category.
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- Runs in your browser
- 10 categories
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How It Works
Convert in three steps.
Pick a category
Length, weight, temperature, volume, area, speed, data size, time, pressure or energy.
Enter a value
Choose the unit you have and the unit you need.
Read the result
The answer is shown at the top, with the value in every other unit below.
Where the conversion factors come from
Most imperial and US units have exact metric definitions set by international agreement: an inch is exactly 25.4 mm, a pound exactly 0.45359237 kg and a US gallon exactly 3.785411784 litres. The converter uses those exact values and shows up to 10 significant digits, so 1 mile comes out as exactly 1.609344 km. Temperature is the exception: it is converted with formulas, because 0 °C is not 0 °F.
Months and years are averages (a year of 365.2425 days, as in the Gregorian calendar). For calendar maths between two dates, count the actual days instead.
Exact definitions
Inches, feet, miles, pounds, ounces and gallons use their legal metric definitions.
Decimal and binary sizes
1 GB is 1,000,000,000 bytes; 1 GiB is 1,073,741,824. That is why a "1 TB" drive shows about 931 GiB.
US and UK gallons
A US gallon is 3.785 L, a UK (imperial) gallon 4.546 L, and cups and spoons here are US measures.
Calories
Food labels' Calories are kilocalories. Energy uses the thermochemical calorie (4.184 J).
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Why Use This Unit Converter
Exact answers for everyday and technical units.
Ten categories
From cooking measures to megabits and kilowatt-hours.
Every unit at once
One value, shown in all units of the category.
Quick swap
Flip the from and to units with one click.
Clean numbers
Up to 10 significant digits, without floating-point noise such as 0.30000000000000004.
Frequently Asked Questions
Questions people ask about the Unit Converter.
Subtract 32 and multiply by 5/9. 98.6 °F is 37 °C. The converter does this for you, and -40 is the one temperature that is the same in both.
Drive makers use decimal units (1 TB = 10^12 bytes), while Windows reports binary units it labels GB and TB (really GiB and TiB). 1 TB is about 931 GiB.
No. This converter uses the US cup (about 237 mL). Recipes from the UK, Australia and Canada often mean a 250 mL metric cup.
A byte is 8 bits. Internet speeds are given in megabits per second, so a 100 Mbit/s connection moves about 12.5 megabytes per second at best.
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