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Miles to Kilometers

Miles (mi) to kilometers (km).

Result42.1648km

Precision (significant figures)

Formula

km = mi × 1.60934

1 mi = 1.60934 km

km = miles × 1.609344 exactly. The international mile has been defined from the international yard since 1959, so 1 mile is exactly 1.609344 km and 26.2 miles is 42.1648 km. The shortcut ×1.6 is close but slightly low.

Formula

km = mi × 1.60934

Worked example

  1. Start with 26.2 mi.
  2. Multiply by 1.60934 (km per mi): 26.2 × 1.60934 = 42.1648 km.

Miles to km chart

Miles (mi)Kilometers (km)
0.250.402336
0.50.804672
11.60934
23.21869
34.82803
3.14.98897
58.04672
6.29.97793
1016.0934
13.121.0824
2032.1869
26.242.1648
5080.4672
100160.934
250402.336
1,0001,609.34

When you need this conversion

Road trips in the US or UK viewed from a metric country, running plans in miles converted for a metric race, or comparing car ranges and commute distances.

Quick reference

  • 1 mi = 1.609344 km
  • 3.1 mi ≈ 5 km
  • 13.1 mi ≈ 21.08 km (a half marathon)
  • 100 mi = 160.934 km
  • 500 mi = 804.672 km

Where the number comes from

A mile is 1,760 yards, and a yard is exactly 0.9144 m. So a mile is 1,760 × 0.9144 = 1,609.344 m exactly. No rounding is involved anywhere.

Common mistakes

Using 1.6 for long distances. Over 500 miles, the shortcut is 4.7 km short.

Mixing up statute and nautical miles. Nautical miles are 1,852 m and appear in shipping and aviation.

For the reverse, use km to miles. For speeds, use mph to km/h.

Questions

How many km is 1 mile?

Exactly 1.609344 km.

How many km is 26.2 miles?

42.1648 km. The official marathon is 42.195 km, which is 26.2188 miles.

How many km is 100 miles?

160.934 km.

How do I estimate quickly?

Multiply by 1.6, or by 8 and divide by 5. 50 × 8 ÷ 5 = 80 km (exact: 80.47).

Sources

Last reviewed 2026-09-24. How we check values · Report a problem with this page