Kilometer to Mile (km to mi)
Result
0.6213711922 Mile
Formula
mi = km × 0.6213711922
1 km = 0.6213711922 mi, and 1 mi = 1.609344 km.
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 km × 0.6213711922 = 0.62137119 mi
- 5 km × 0.6213711922 = 3.106856 mi
- 10 km × 0.6213711922 = 6.2137119 mi
- 21.0975 km × 0.6213711922 = 13.109379 mi
Things to know about km to mi
- Multiply by 0.621371. A quick mental estimate is ×0.6 plus a little: 10 km ≈ 6 miles (exactly 6.2137).
- Race distances: 5K = 3.107 mi, 10K = 6.214 mi, half marathon (21.0975 km) = 13.109 mi.
Kilometer to Mile table
| Kilometer (km) | Mile (mi) |
|---|---|
| 1 | 0.62137119 |
| 2 | 1.2427424 |
| 5 | 3.106856 |
| 10 | 6.2137119 |
| 20 | 12.427424 |
| 21.0975 | 13.109379 |
| 50 | 31.06856 |
| 100 | 62.137119 |
| 1,000 | 621.37119 |
The units
- Kilometer (km)
- 1,000 metres. Road distances and speed limits in most of the world use kilometres.
- Mile (mi)
- The international (statute) mile: 5,280 ft, exactly 1,609.344 m.
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