Miles to Km Converter
Convert miles to kilometers, or kilometers to miles, instantly.
Distance Conversion Formulas
Kilometers = miles × 1.60934. Miles = kilometers ÷ 1.60934.
The mile is used for everyday driving distances and road signage in the US, UK, and a handful of other countries, while kilometers are the standard almost everywhere else and in nearly all scientific and international contexts.
Worked example
Convert a 26.2-mile marathon to kilometers.
26.2 × 1.60934 ≈ 42.16
26.2 miles ≈ 42.16 km
Worked example (km to miles)
Convert 100 km to miles.
100 ÷ 1.60934 ≈ 62.137
100 km ≈ 62.137 miles
Quick reference: race distances
| Kilometers | Miles |
|---|---|
| 5 km (5K) | 3.107 |
| 10 km (10K) | 6.214 |
| 21.1 km (half marathon) | 13.11 |
| 42.195 km (marathon) | 26.22 |
Keep going
- Miles-to-km and meters-to-feet are the same metric-to-imperial length conversion at different scales; the meters to feet calculator handles the shorter-distance version. Meters ↔ Feet Calculator
- Miles-to-km converts a distance; mph-to-kmh applies that same conversion factor to a speed instead, and the mph to kmh calculator runs it directly. MPH ↔ KM/H Calculator
Frequently Asked Questions
How many kilometers are in a mile?
1 mile = 1.60934 kilometers.
How many miles are in a kilometer?
1 kilometer = 0.621371 miles.
Why is a mile equal to 1.60934 km specifically?
A mile is defined internationally as exactly 1,609.344 meters. Dividing by 1,000 to convert to kilometers gives the 1.60934 conversion factor.
How many miles is a 5K or 10K race?
A 5K is 5 ÷ 1.60934 ≈ 3.107 miles. A 10K is double that distance: 10 ÷ 1.60934 ≈ 6.214 miles.
How many miles is a half marathon?
A half marathon is 21.1 km, which is 21.1 ÷ 1.60934 ≈ 13.11 miles — half of the full 26.2-mile marathon distance shown in the example above.
How far is the moon, in miles and kilometers?
The average Earth-Moon distance is about 384,400 km, which is 384,400 ÷ 1.60934 ≈ 238,855 miles — one of the most commonly cited real-world distances for this conversion.
What's a common mistake converting miles to km?
Rounding 1.60934 down to 1.6 for long distances. At 1,000 miles, 1.6 gives 1,600 km, while the accurate factor gives 1,609.34 km — a small percentage error that still adds up to over 9 km at that scale.
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