Mile to Kilometer (mi to km)
Result
1.609344 Kilometer
Formula
km = mi × 1.609344
1 mi = 1.609344 km, and 1 km = 0.6213711922 mi.
The metre is the SI base unit, defined by the speed of light. Since the 1959 international yard and pound agreement the imperial and US customary units are defined exactly in metres: 1 yard = 0.9144 m, so 1 foot = 0.3048 m, 1 inch = 2.54 cm and 1 mile = 1,609.344 m.
Worked examples
- 1 mi × 1.609344 = 1.609344 km
- 5 mi × 1.609344 = 8.04672 km
- 26.2188 mi × 1.609344 = 42.195068 km
- 100 mi × 1.609344 = 160.9344 km
Things to know about mi to km
- The mile here is the international statute mile, exactly 1,609.344 m, so the factor 1.609344 is exact rather than rounded.
- A marathon is 42.195 km, which is 26.2188 miles — the figure behind "26.2".
- Nautical miles (1.852 km) are a different unit; use them for sea and air navigation.
Mile to Kilometer table
| Mile (mi) | Kilometer (km) |
|---|---|
| 1 | 1.609344 |
| 2 | 3.218688 |
| 5 | 8.04672 |
| 10 | 16.09344 |
| 20 | 32.18688 |
| 26.2188 | 42.195068 |
| 50 | 80.4672 |
| 100 | 160.9344 |
| 1,000 | 1,609.344 |
The units
- Mile (mi)
- The international (statute) mile: 5,280 ft, exactly 1,609.344 m.
- Kilometer (km)
- 1,000 metres. Road distances and speed limits in most of the world use kilometres.
Sources for these factors
- The International System of Units (SI Brochure), 9th edition — BIPM
- Handbook 44 (2024), Appendix C: General Tables of Units of Measurement — NIST
- Guide for the Use of the International System of Units (SP 811), Appendix B: conversion factors — NIST
Last reviewed against these sources. An automated check recomputes every factor from its definition on each build. How we check accuracy