Miles to Kilometres Converter (mi to km)
Convert miles to kilometres instantly. 1 mi = 1.609 km. Includes the formula, a full conversion table and a calculator that works offline.
The formula
To convert miles to kilometres, multiply by 1.609:
km = mi × 1.609Going the other way, divide instead — or multiply by 0.6214, which is the same thing:
mi = km × 0.6214Miles to Kilometres conversion table
| Miles | Kilometres |
|---|---|
| 1 mi | 1.609 km |
| 2 mi | 3.219 km |
| 3 mi | 4.828 km |
| 4 mi | 6.437 km |
| 5 mi | 8.047 km |
| 6 mi | 9.656 km |
| 7 mi | 11.265 km |
| 8 mi | 12.875 km |
| 9 mi | 14.484 km |
| 10 mi | 16.093 km |
| 15 mi | 24.14 km |
| 20 mi | 32.187 km |
| 25 mi | 40.234 km |
| 30 mi | 48.28 km |
| 40 mi | 64.374 km |
| 50 mi | 80.467 km |
| 75 mi | 120.7 km |
| 100 mi | 160.93 km |
| 250 mi | 402.34 km |
| 500 mi | 804.67 km |
| 1000 mi | 1,609.34 km |
Kilometres to Miles
| Kilometres | Miles |
|---|---|
| 1 km | 0.6214 mi |
| 2 km | 1.243 mi |
| 3 km | 1.864 mi |
| 4 km | 2.485 mi |
| 5 km | 3.107 mi |
| 6 km | 3.728 mi |
| 7 km | 4.35 mi |
| 8 km | 4.971 mi |
| 9 km | 5.592 mi |
| 10 km | 6.214 mi |
What that actually looks like
A conversion factor is hard to judge on its own. These are quantities most people already have a feel for, converted for you:
- A 5K run is 3.1 miles — 4.989 km
- A marathon is 26.2 miles — 42.165 km
- A typical commute is around 15 miles — 24.14 km
- New York to Boston is 215 miles — 346.01 km
Why both units are still in use
Almost every country measures length in metres and centimetres. The United States is the significant exception, and the United Kingdom is genuinely split: road signs are in miles, a person's height is in feet and inches, but a bottle of water is in millilitres and a running race is in kilometres. That is why this conversion comes up so often — not because one system is replacing the other, but because both are in daily use side by side.
Mistakes worth avoiding
The most common mistake is mixing feet and inches in one number. Five foot ten is 5.833 feet, not 5.10 — the inches are twelfths, not hundredths. Convert the inches separately, or work in inches throughout and divide at the end.
The other habit worth breaking is rounding too early. Convert first, round once at the end, and you avoid the drift that turns a small approximation into a visible error by the third calculation.
Doing it in your head
When you only need a rough answer, multiply by 8 and divide by 5 — which lands within 0.6 percent of the true value. Ten miles works out at roughly 16 kilometres that way, against 16.093 exactly. An estimate is enough for deciding whether something will fit or whether a figure sounds plausible. When the number has to be right — because you are buying, cooking or building to it — use the calculator and let it carry the decimals.
Common questions
How many kilometres are in one mile?
One mile equals 1.609 kilometres. The calculator above handles any value, including decimals and very large numbers, and updates as you type.
Is this an exact conversion?
Yes — this is an exact defined ratio, not an approximation. The table rounds for readability; the calculator does not.
Does this work offline?
Yes. The conversion runs in your browser with no network request, so it works on a plane, in a basement, or on a phone with no signal once the page has loaded.