--- title: "21 km to mi = 13.0488 mi" description: "21 kilometers is 13.0488 miles. The arithmetic, a table of nearby values, and a converter for any other number." url: https://atoneplace.net/convert/21-km-to-miles/ site: "At One Place" --- # 21 km to mi **21 kilometers in miles: 21 km = 13.0488 mi** mi = km × 0.6213711922 21 kilometers is 13.0488 miles. To get there, multiply by 0.6213711922. ## Values either side *Kilometers near 21, converted to miles.* | Kilometers | Miles | | --- | --- | | 17 km | 10.56331 | | 18 km | 11.18468 | | 19 km | 11.80605 | | 20 km | 12.42742 | | 21 km ← | 13.0488 | | 22 km | 13.67017 | | 23 km | 14.29154 | | 24 km | 14.91291 | | 25 km | 15.53428 | ## How the conversion works The relationship is mi = km × 0.6213711922. Both units measure length, so the conversion is a fixed factor that never changes. The figure is exact rather than approximate: since the international yard and pound agreement of 1959, an inch is defined as exactly 25.4 millimetres and a pound as exactly 0.45359237 kilograms, and every other imperial and US customary unit here is derived from those two. ## Common questions ### What is 21 km in miles? 21 km is 13.0488 mi. ### How do you convert kilometers to miles? Multiply by 0.6213711922. ## Related pages - [Kilometers to miles](https://atoneplace.net/convert/km-to-miles/) - [21 mi to km](https://atoneplace.net/convert/21-miles-to-km/) - [17 km to mi](https://atoneplace.net/convert/17-km-to-miles/) - [18 km to mi](https://atoneplace.net/convert/18-km-to-miles/) - [19 km to mi](https://atoneplace.net/convert/19-km-to-miles/) - [20 km to mi](https://atoneplace.net/convert/20-km-to-miles/) - [22 km to mi](https://atoneplace.net/convert/22-km-to-miles/) - [23 km to mi](https://atoneplace.net/convert/23-km-to-miles/) - [24 km to mi](https://atoneplace.net/convert/24-km-to-miles/) - [25 km to mi](https://atoneplace.net/convert/25-km-to-miles/) ## Sources - Guide for the Use of the International System of Units (SP 811) — NIST (https://www.nist.gov/pml/special-publication-811) [Public domain (US Government)] - The International System of Units (SI Brochure) — Bureau International des Poids et Mesures (https://www.bipm.org/en/publications/si-brochure) - Calculated on this page — At One Place (/about/)