Unit Converter
Convert length, weight, volume, area, speed, time and temperature between metric, US and imperial units.
Convert
Filled in with example values. Replace them with your own.
Results update as you type.
Result
10 km = 6.213711922 mi
In miles
6.213711922 mi
10 km in every unit
- millimetres10,000,000 mm
- centimetres1,000,000 cm
- metres10,000 m
- kilometres10 km
- inches393,700.7874 in
- feet32,808.39895 ft
- yards10,936.13298 yd
- miles6.213711922 mi
- nautical miles5.399568035 nmi
How the unit converter works
Pick what you are converting, enter a value and choose the units. Each value is turned into a base unit (metres, kilograms, litres and so on) and then into the unit you want, and the result is shown in every unit at once.
Exact definitions used
1 in = 2.54 cm · 1 ft = 12 in · 1 yd = 3 ft · 1 mi = 1,760 yd = 1.609344 km
1 lb = 0.45359237 kg · 1 lb = 16 oz · 1 stone = 14 lb
1 US gal = 231 in³ = 3.785411784 L = 128 US fl oz = 16 US cups
1 UK gal = 4.54609 L = 160 UK fl oz = 8 UK pints
1 acre = 4,840 yd² · 1 ha = 10,000 m² · 1 knot = 1,852 m per hour
°F = °C × 9/5 + 32 · K = °C + 273.15
Worked examples
- 10 km = 10 ÷ 1.609344 = 6.214 miles.
- 1 kg = 1 ÷ 0.45359237 = 2.205 lb.
- 20 °C = 68 °F; −40 is the same in both.
- 1 acre = 4,046.86 m² = 0.405 hectares.
Frequently asked questions
Are the conversions exact?
Yes. The units are defined exactly in terms of metric ones: an inch is 2.54 cm, a pound is 0.45359237 kg, a US gallon is 231 cubic inches and a UK gallon is 4.54609 litres. Results are rounded to 10 significant digits for display.
Why are there US and UK gallons, pints and fluid ounces?
They are different units with the same names. A UK gallon is about 20% larger than a US gallon, and a UK pint holds 20 fluid ounces against 16 in a US pint. Check which one a recipe or label means.
How do I convert Celsius to Fahrenheit?
Multiply by 9/5 and add 32. 20 °C is 20 × 1.8 + 32 = 68 °F. To go back, subtract 32 and multiply by 5/9.
How long is a year here?
Exactly 365 days, as labelled. Calendar years vary (leap years have 366 days), so for dates use the Date Calculator.