Miles to kilometres
Convert miles to kilometres both ways, exactly. Multiply miles by 1.609344. Free, and nothing you type leaves your device.
Miles to kilometres: the numbers
1 mi = 1.609344 km exactly · 1 km = 0.6214 mi (rounded)
Multiply miles by 1.609344. Source: international yard and pound (1959), NIST SP 811.
| mi | km |
|---|---|
| 1 mi | 1.609344 km |
| 2 mi | 3.218688 km |
| 3 mi | 4.828032 km |
| 4 mi | 6.437376 km |
| 5 mi | 8.04672 km |
| 6 mi | 9.656064 km |
| 7 mi | 11.265408 km |
| 8 mi | 12.874752 km |
| 9 mi | 14.484096 km |
| 10 mi | 16.09344 km |
| 11 mi | 17.702784 km |
| 12 mi | 19.312128 km |
| 13 mi | 20.921472 km |
| 14 mi | 22.530816 km |
| 15 mi | 24.14016 km |
| 16 mi | 25.749504 km |
| 17 mi | 27.358848 km |
| 18 mi | 28.968192 km |
| 19 mi | 30.577536 km |
| 20 mi | 32.18688 km |
How it works
- 1Pick or typePick a kind of measure, or type a question like “72f”.
- 2Type a valueThe other side updates as you type, both ways, exact where it can be.
- 3Copy, print or shareCopy the result, print a table, or share a link to the same conversion.
How it's worked out
- Length
- Every unit is an exact number of metres. The inch is 2.54 cm exactly (since 1959), the foot 12 inches, the mile 5,280 feet.
- Weight and mass
- The pound is 0.45359237 kg exactly; the ounce 1/16 lb; the stone 14 lb; the tola 180 grains.
- Volume
- The US gallon is 231 cubic inches (3.785411784 L); the UK gallon 4.54609 L. Cups, pints and fluid ounces follow from them.
- Temperature
- °F = °C × 9/5 + 32; K = °C + 273.15. A change in °C is 9/5 of that change in °F.
- Area
- An acre is 43,560 square feet; a gaj is a square yard; a cent is 1/100 acre; a guntha 1/40 acre.
- Data
- kB, MB, GB and TB step by 1,000; KiB, MiB, GiB and TiB by 1,024 (IEC 80000-13).
- Cooking
- Grams per cup from USDA FoodData Central; real cups vary with how they're filled.
- Exact or rounded
- Sums use exact fractions. A result is Exact only when the shown number is the whole answer; otherwise it's Rounded, half away from zero.
Sources: NIST SP 811 (2008), NIST Handbook 44 (2026) Appendix C, the SI Brochure (9th ed., 2019), IAU, 21 CFR 101.9, USDA FoodData Central SR Legacy (2018).
Questions
How do I convert miles to kilometres?
Multiply miles by 1.609344. The converter above does it as you type, both ways, and shows whether the answer is exact.
How do I convert cm to inches?
Divide by 2.54. An inch is exactly 2.54 cm, so 30 cm is 30 ÷ 2.54 = 11.81 inches.
How do I convert kg to pounds?
Divide by 0.45359237, or multiply by about 2.2046. A pound is exactly 0.45359237 kg, so 70 kg is 154.32 lb.
What's the formula for Celsius to Fahrenheit?
°F = °C × 9/5 + 32. 20 °C is 68 °F. The other way: °C = (°F − 32) × 5/9.
Why are US and UK gallons different?
They come from different old measures. A US gallon is 3.785411784 litres; a UK (imperial) gallon is 4.54609 litres. Pints and fluid ounces differ too, so pick the one your recipe or label uses.
How many grams are in a cup?
It depends on what's in the cup. A US cup of all-purpose flour is about 125 g, sugar about 200 g and butter about 227 g (USDA). Pick the ingredient in Cooking. Real cups vary with how they're filled.
What do Exact and Rounded mean?
Exact means the shown number is the full answer. Rounded means the answer goes on longer and was cut to the precision you chose. Change the precision in Settings.
Why does my 1 TB drive show as 931 GB?
Drives are sold in decimal units (1 TB = 1,000,000,000,000 bytes). Many computers count in binary units (1 GiB = 1,073,741,824 bytes) but label them GB. Both are the same amount of space.
What's the difference between oz and fl oz?
An ounce (oz) is a weight; a fluid ounce (fl oz) is a volume. They match only for water-like liquids, roughly.
Why can't I convert bigha, katha or marla?
Their size differs from state to state, sometimes by district. Check your local land records for the value used where the land is. Gaj, cent, guntha, acre and hectare have one fixed size and are included.
Can I use these numbers for trade or medicine?
For trade, medicine or safety-critical use, use certified measuring tools and official values. For medicine, use the measure that came with it: a kitchen teaspoon isn't a dosing spoon.
Is anything I type sent anywhere?
No. Every conversion happens in your browser. A shared link keeps the values after a #, a part of the link that browsers don't send to servers.