Quick Answer
>1 mile = 1.609344 km (exact) = 1.609 km (3 d.p.) = 1,609.344 metres. To convert miles to km: multiply by 1.609. To convert km to miles: multiply by 0.621.
Miles to km Conversion Table
| Miles | Kilometres (exact) | Kilometres (rounded) | Common reference |
|---|---|---|---|
| 0.5 miles | 0.80467 km | 0.8 km | — |
| 1 mile | 1.609344 km | 1.609 km | 1 mile |
| 2 miles | 3.21869 km | 3.219 km | — |
| 3 miles | 4.82803 km | 4.828 km | — |
| 3.1 miles | 4.98965 km | 4.99 km | 5K race |
| 5 miles | 8.04672 km | 8.047 km | — |
| 6.2 miles | 9.97799 km | 9.978 km | 10K race |
| 10 miles | 16.0934 km | 16.093 km | — |
| 13.1 miles | 21.0824 km | 21.082 km | Half marathon |
| 20 miles | 32.1869 km | 32.187 km | Long training run |
| 26.2 miles | 42.1648 km | 42.165 km | Marathon |
| 50 miles | 80.4672 km | 80.467 km | Ultra marathon |
| 100 miles | 160.934 km | 160.934 km | 100-mile ultra |
Formula: km = miles × 1.609344
km to Miles Conversion Table
| Kilometres | Miles (exact) | Miles (rounded) | Common reference |
|---|---|---|---|
| 1 km | 0.621371 miles | 0.621 miles | — |
| 5 km | 3.10686 miles | 3.107 miles | 5K race |
| 10 km | 6.21371 miles | 6.214 miles | 10K race |
| 15 km | 9.32057 miles | 9.321 miles | 15K race |
| 21.0975 km | 13.1094 miles | 13.1 miles | Half marathon |
| 30 km | 18.6411 miles | 18.641 miles | Long run benchmark |
| 42.195 km | 26.2188 miles | 26.2 miles | Marathon |
| 50 km | 31.0686 miles | 31.069 miles | 50K ultra |
| 100 km | 62.1371 miles | 62.137 miles | 100K ultra |
Formula: miles = km ÷ 1.609344
How to Convert Miles to km Without a Calculator
The exact conversion factor of 1.609344 is hard to work with mentally. There are two practical shortcuts:
Quick approximation (multiply by 1.6): For every mile, add 60% of the distance. So 10 miles → 10 + 6 = 16 km. This is accurate to within 0.4% — close enough for almost all practical purposes.
The Fibonacci method (surprisingly accurate): The Fibonacci sequence — 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144 — produces an almost perfect miles-to-km conversion. Any Fibonacci number of miles equals approximately the next Fibonacci number in kilometres. So: 5 miles ≈ 8 km, 8 miles ≈ 13 km, 13 miles ≈ 21 km, 21 miles ≈ 34 km. This works because the ratio between adjacent Fibonacci numbers (1.618) is close to the mile-to-km conversion factor (1.609). The accuracy improves as the numbers get larger.
The Fibonacci trick produces a memorable insight for runners: the common race distances in miles and kilometres are themselves adjacent Fibonacci numbers — a 5K (≈3.1 miles) ≈ 5 miles, a 10K (6.2 miles) ≈ 8 miles, a half marathon (13.1 miles) ≈ 13 miles, a marathon (26.2 miles) ≈ 34 km… the distances weren’t designed this way, but the mathematical coincidence holds remarkably well.
Running Pace Conversion: min/mile to min/km
For runners, the most practical application of the miles-to-km conversion is pace. Training plans and race targets are sometimes expressed in min/mile (common in the US and UK) and sometimes in min/km (standard in Australia and most of the world). Converting between them uses the same 1.609344 factor.
| min/mile | min/km | km/h | Common use |
|---|---|---|---|
| 6:00/mile | 3:44/km | 16.1 km/h | Sub-40 min 10K pace |
| 6:52/mile | 4:16/km | 14.1 km/h | Sub-1:30 half marathon pace |
| 7:15/mile | 4:30/km | 13.3 km/h | Sub-45 min 10K pace |
| 8:00/mile | 4:58/km | 12.1 km/h | Sub-3:30 marathon pace |
| 9:09/mile | 5:41/km | 10.6 km/h | Sub-4:00 marathon / sub-2:00 half pace |
| 10:00/mile | 6:13/km | 9.7 km/h | Easy recreational running |
| 11:27/mile | 7:06/km | 8.5 km/h | Sub-5:00 marathon pace |
| 12:00/mile | 7:27/km | 8.1 km/h | Brisk walk / easy jog |
Formula: To convert min/mile to min/km — divide pace in seconds by 1.609344. Example: 8:00/mile = 480 seconds ÷ 1.609344 = 298 seconds = 4:58/km. To convert min/km to min/mile — multiply pace in seconds by 1.609344. Our running pace calculator handles all pace and distance conversions automatically, including treadmill speed (km/h) to race pace. Our treadmill pace chart covers the full range of treadmill speeds with min/km, min/mile and race projection equivalents.
Common Race Distances in Miles and km
For runners switching between metric and imperial training plans or race distances, the key conversions to memorise are:
5K = 3.1 miles. The most popular race distance worldwide. Exactly 5 km. The 3.1 miles figure is rounded from 3.10686 miles.
10K = 6.2 miles. Exactly 10 km = 6.2137 miles, rounded to 6.2. Our 10K distance guide covers everything about this distance.
Half marathon = 13.1 miles = 21.1 km. The official distance is 21.0975 km = 13.1094 miles. Both the 13.1 and 21.1 figures are rounded. Our half marathon distance guide covers times, pacing, and training.
Marathon = 26.2 miles = 42.195 km. The official distance is defined as 42.195 km. The imperial equivalent of 26.2 miles is rounded from 26.2188 miles. Our marathon distance guide covers the full breakdown.
Train With Paced Sessions — No Conversion Needed
SportCoaching's running training plans specify every session in both min/km and min/mile, with treadmill speed equivalents — so you can train effectively regardless of which system your watch or treadmill uses.
FAQ: Miles to km Conversion
How many km is a mile?
1 mile = 1.609344 km exactly. Rounded: 1.609 km. Quick approximation: 1.6 km. The conversion was internationally standardised in 1959.
How many miles is a kilometre?
1 km = 0.621371 miles. Quick approximation: multiply km by 0.6. More accurate: multiply by 2 and divide by 3.
How do I convert miles to km?
Multiply by 1.609344. Quick method: multiply by 1.6. Fibonacci method: 5 miles ≈ 8 km, 8 miles ≈ 13 km, 13 miles ≈ 21 km — adjacent Fibonacci numbers give remarkably accurate conversions.
How do I convert min/mile pace to min/km?
Divide the pace in seconds by 1.609344. Example: 9:00/mile = 540 ÷ 1.609344 = 336 seconds = 5:36/km. To convert min/km to min/mile: multiply seconds by 1.609344.
How many km is 13.1 miles (half marathon)?
13.1 miles = 21.082 km. The official half marathon is 21.0975 km (= 13.1094 miles, rounded to 13.1). A marathon (26.2 miles) = 42.165 km; the official distance is 42.195 km.
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