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.
The link carries the values you entered, so whoever opens it sees the same result. Nothing is stored on our side — the numbers travel in the link itself.
Kilometers to miles reference table
The conversions people look up most often, rounded to 4 decimal places.
| Kilometer (km) | Mile (mi) |
|---|---|
| 1 km | 0.6214 mi |
| 2 km | 1.2427 mi |
| 5 km | 3.1069 mi |
| 10 km | 6.2137 mi |
| 15 km | 9.3206 mi |
| 20 km | 12.4274 mi |
| 21.0975 km | 13.1094 mi |
| 42.195 km | 26.2188 mi |
| 50 km | 31.0686 mi |
| 100 km | 62.1371 mi |
| 200 km | 124.2742 mi |
| 500 km | 310.6856 mi |
| 1,000 km | 621.3712 mi |
The kilometers people look up most
- 5 km = 3.1069 mi
- A 5K. It is 3.107 miles, not 3.1 - the race is defined in kilometres and the mileage is the conversion.
- 10 km = 6.2137 mi
- A 10K: 6.214 miles. Twice the 5K distance but rarely twice the time, which is why race predictors use an exponent rather than a multiple.
- 21.0975 km = 13.1094 mi
- A half marathon: 13.109 miles, which is where the "13.1" comes from.
- 42.195 km = 26.2188 mi
- A marathon. The 26.219 miles traces back to the 1908 London Olympic course, which is why it resists a tidy number.
- 100 km = 62.1371 mi
- Not 60 miles, whatever the round number suggests - which matters where speed enforcement is automated and tolerances are a few percent.
How the km to miles 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. The coincidence is real: the golden ratio is 1.618, and the km-to-mile factor is 1.609.
Where the conversion matters beyond running. Fuel range on an imported car is quoted in kilometres, so a 600 km range is 372.8 miles. Road signs in Ireland are metric while Northern Ireland's are imperial, which is why a border crossing changes the numbers without changing the road — an 80 km/h limit becomes 60 mph a few metres later, and those are not the same speed.
Marathon splits are the case where rounding compounds. A 5 km split is 3.107 miles, so mile markers and kilometre markers drift steadily apart: by 40 km, the 24.85-mile point, they are over a mile out of step. Races that post both use two separate sets of markers rather than converting one.
To go from miles back to kilometers, multiply by 1.609344 instead — or use the miles to km converter.
Frequently asked questions
Why does my watch show more distance than the race did?
Because a certified course is measured along the shortest route a runner could legally take, and nobody runs it. Courses are measured with a calibrated bicycle along the tangents, then lengthened by a 0.1% short-course prevention factor, so a marathon is laid out at least 42.237 km. Add GPS error between buildings and 42.4 km on the watch for a 42.195 km race is entirely normal.
How do I convert a pace in minutes per kilometre to minutes per mile?
Multiply the pace by 1.609344, the same factor as the distance - a pace is time per unit distance, so it scales the same way. Five minutes per kilometre is 8.05 minutes per mile, which is 8 minutes 3 seconds once you multiply the 0.05 by 60. Reading 8.05 as 8 minutes 5 seconds is the usual slip, and it is worth two seconds a mile.
Why does my odometer disagree with the mapped distance?
Tyre size and wear. An odometer counts wheel revolutions and assumes a rolling radius, so worn tyres - which are slightly smaller - turn more often over the same ground and the reading runs high, commonly by one to three per cent. A mapping app measures the road geometry instead. Convert whichever figure you trust, but do not expect the two to agree to the kilometre.
Related converters
- Miles to KM ConverterConvert miles to kilometers instantly, with a reference table covering race distances, speed limits and journey lengths.
- KM to Meters ConverterConvert kilometers to meters instantly, with a reference table for race distances, altitudes and map scales.
- MPH to KM/H ConverterConvert miles per hour to kilometers per hour instantly, with a reference table of common speed limits.
Further reading
- What Is a Good 10K Time?Under an hour is the milestone most runners aim at, and it means holding 6:00 per kilometre. Here is where every time actually sits.
- What Is a Good 5K Time?Under 30 minutes is a genuine milestone. Here is what each time means in pace, what it predicts at longer distances, and how to move between them.
- Metric vs Imperial: What Actually DiffersEvery factor you need, all exact by definition — plus the three conversions people get wrong, and why area is not what you expect.