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KM to Miles Converter

Convert kilometers to miles instantly, with a reference table covering race distances and road trips.

KM to Miles Converter

1 km = 0.6214 mi

Multiply kilometers by 0.62137119 to get miles.

Kilometers to miles reference table

The conversions people look up most often, rounded to 4 decimal places.

Common kilometers to miles conversions
Kilometer (km)Mile (mi)
1 km0.6214 mi
2 km1.2427 mi
5 km3.1069 mi
10 km6.2137 mi
15 km9.3206 mi
20 km12.4274 mi
21.0975 km13.1094 mi
42.195 km26.2188 mi
50 km31.0686 mi
100 km62.1371 mi
200 km124.2742 mi
500 km310.6856 mi
1,000 km621.3712 mi

How the km to miles converter calculation works

One kilometer is 0.621371 miles, so:

miles = kilometers × 0.621371

The factor derives from the definition of the international mile as exactly 1,609.344 meters. Divide 1,000 by 1,609.344 and you get the 0.621371 figure used here.

Running distances make the clearest examples. A 5K is 5 × 0.621371 = 3.107 miles. A half marathon at 21.0975 km is 13.109 miles, and a full marathon at 42.195 km is 26.219 miles — the famous 26.2. Driving, a 100 km stretch of highway is 62.1 miles, which is why a 100 km/h speed limit sign reads as roughly 62 mph.

Two habits that make this conversion easy:

  • Multiply by 0.6 for a fast estimate. It undershoots by about 3.4%, so 100 km reads as 60 rather than 62.1 — close enough for trip planning.
  • The Fibonacci trick actually works. Consecutive Fibonacci numbers approximate the km-to-mile ratio: 5 km ≈ 3 mi, 8 km ≈ 5 mi, 13 km ≈ 8 mi, 21 km ≈ 13 mi. That last one is the half marathon, accurate to within a tenth of a mile.

To go from miles back to kilometers, multiply by 1.609344 instead.

Frequently asked questions

How do I convert kilometers to miles?

Multiply the number of kilometers by 0.621371192 to get miles.

How many miles are in 15 km?

15 km equals 9.3206 mi. The reference table on this page lists the other values people look up most often.

How do I convert miles back to kilometers?

Divide the number of miles by 0.621371192, or use the swap control on the converter above.

Is this conversion exact?

Yes. The factor is fixed by international definition rather than measured, so the conversion is exact - only the displayed rounding limits precision.

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