How many km is 1 mile?

1 mile = 1.60934 kilometers exactly. For a quick estimate, multiply miles by 1.6. For example, 5 miles × 1.6 = 8 km (actual: 8.047 km).

Is a 5K race 3.1 miles?

Yes. 5 kilometers = 3.1069 miles, typically rounded to 3.1 miles. A 5K is the most popular race distance worldwide and takes most recreational runners 25–40 minutes to complete.

How many miles is a marathon?

A marathon is 42.195 km = 26.219 miles (officially 26 miles and 385 yards). A half marathon is 21.0975 km = 13.109 miles. The distance originated from the 1908 London Olympics course from Windsor Castle to Olympic Stadium.

How do I convert miles to km mentally?

Multiply miles by 1.6 for a quick approximation (actual factor is 1.60934). Example: 10 miles × 1.6 = 16 km (actual: 16.09 km). The error is less than 0.6%. For even faster estimation: add 60% of the miles value to the miles value. Example: 10 miles → 10 + 6 = 16 km.

Unit Converter

Miles to Km Converter

Convert miles to kilometers or km to miles instantly. Type in either field — perfect for runners, cyclists, and anyone following international training plans.

Miles ↔ Kilometers

1 mile = 1.60934 km · 1 km = 0.62137 miles

Miles

Kilometers (km)

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Miles are the primary distance unit in the US and UK for road running and cycling. Most of the world — and all international race events — use kilometers. Whether you're translating a US training plan to kilometres, figuring out how far a race is, or checking your GPS watch readout against a European race course, this converter works instantly in both directions.

Race Distance Reference Table

Race	Kilometers (km)	Miles	Average finish time
1 Mile Race	1.609 km	1.000 mile	5–10 min
5K	5.000 km	3.107 miles	20–40 min
8K	8.000 km	4.971 miles	32–55 min
10K	10.000 km	6.214 miles	40–70 min
15K	15.000 km	9.321 miles	60–100 min
Half Marathon	21.098 km	13.109 miles	1h30–2h30
30K	30.000 km	18.641 miles	2h10–3h30
Marathon	42.195 km	26.219 miles	3h–5h30
50K Ultra	50.000 km	31.069 miles	4h–7h
100K Ultra	100.000 km	62.137 miles	8h–18h

Miles vs Kilometres in Running and Cycling

Miles are used in the United States and United Kingdom for road running, cycling distances, and GPS watch defaults. The rest of the world — and virtually all international race organisations — use kilometres. A 10K race is 10 kilometers (6.21 miles); a marathon is 42.195 km (26.22 miles). When following a US training plan in Europe or vice versa, you'll frequently need to convert pace (min/mile ↔ min/km) as well as distance. Note also that running pace per mile is about 1.609× longer than pace per km — so a 6:00 min/mile pace equals approximately 3:44 min/km.

Frequently Asked Questions

1 mile = 1.60934 km exactly (1 international mile = 1,609.344 metres). For quick mental calculation, multiply miles by 1.6. For example, 10 miles × 1.6 = 16 km (actual: 16.09 km). The error from using 1.6 is less than 0.6%.

Yes — a 5K is 5.000 km = 3.1069 miles, commonly rounded to 3.1 miles. It's the most popular race distance globally. A 10K is 6.214 miles, a half marathon is 13.109 miles, and a full marathon is 26.219 miles.

A marathon is officially 42.195 km = 26 miles and 385 yards (26.22 miles). The distance was standardised at the 1908 London Olympics. A half marathon is exactly half: 21.0975 km = 13.109 miles.

Multiply miles by 1.6 (quick approximation) or add 60% of the value to itself. Example: 10 miles → add 60% (6) → 16 km. Actual is 16.09 km — under 0.6% error. To go km → miles, multiply by 0.6214 or divide by 1.609.

Miles to Km Converter

Miles ↔ Kilometers

Race Distance Reference Table

Miles vs Kilometres in Running and Cycling

Frequently Asked Questions

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