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Convert kilometers to miles: formula and table

Complete guide to convert kilometers to miles with exact formula, reference table and practical examples.

Published on January 10, 2026

Converting kilometers to miles is essential for traveling in the United States, United Kingdom or Canada, for running sports apps and for car navigation data.

Understanding the conversion

1 kilometer equals exactly 0.621371 miles. The conversion is a simple multiplication by this factor. Conversely, 1 mile equals 1.60934 km.

📐 Formula

Miles = Kilometers × 0.621371

📊 Conversion table

Kilometers (km) Miles
1 0.62
5 3.11
10 6.21
21.1 13.11
42.2 26.22
50 31.07
100 62.14
500 310.69
1000 621.37

💡 Practical examples

Example 1: 10 km (sports distance)

10 × 0.621371 ≈ 6.21 miles. The popular 10km race is approximately 6.2 miles.

Example 2: 42.195 km (marathon)

42.195 × 0.621371 ≈ 26.22 miles. The official marathon distance in miles.

Example 3: 100 km/h

100 × 0.621371 ≈ 62.14 mph. A speed of 100 km/h corresponds to about 62 mph on American road signs.

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