The Formula
1 mile = 1.60934 kilometres. To convert miles to km, multiply by 1.60934. To convert km to miles, multiply by 0.62137.
Quick mental trick: Multiply miles by 1.6 for a close estimate. Or use the Fibonacci sequence — consecutive Fibonacci numbers approximate the ratio (5 miles ≈ 8 km, 8 miles ≈ 13 km, 13 miles ≈ 21 km). This works because the Fibonacci ratio (≈1.618) is close to the 1.60934 conversion factor.
Miles to Kilometers: Common Distances
| Miles | Kilometers | Reference |
|---|---|---|
| 0.5 mi | 0.8 km | Short run / walk |
| 1 mi | 1.609 km | 1 mile run |
| 2 mi | 3.219 km | Common evening run |
| 3 mi | 4.828 km | 5K (3.107 mi = 5 km) |
| 5 mi | 8.047 km | 8K run |
| 6.2 mi | 10 km | 10K race |
| 10 mi | 16.09 km | Common long run |
| 13.1 mi | 21.1 km | Half marathon |
| 26.2 mi | 42.2 km | Full marathon |
| 50 mi | 80.5 km | Ultramarathon |
| 100 mi | 160.9 km | Century ride (cycling) |
| 60 mi | 96.6 km | Day drive estimate |
| 100 mi | 160.9 km | Road trip segment |
| 200 mi | 321.9 km | Long road trip |
| 500 mi | 804.7 km | Cross-country segment |
| 1000 mi | 1,609 km | Long-haul flight |
| 3,000 mi | 4,828 km | US coast to coast (approx.) |
| 5,000 mi | 8,047 km | Trans-Atlantic flight |
| 30 mph | 48.3 km/h | Urban speed limit |
| 60 mph | 96.6 km/h | Highway (US) |
| 70 mph | 112.7 km/h | UK motorway limit |
Common Running Distances in Both Units
The most useful conversions for runners are: 5K = 3.107 miles, 10K = 6.214 miles, half marathon = 13.109 miles, marathon = 26.219 miles. Most GPS watches and running apps allow toggling between units, but knowing the conversion by heart saves time on race day.
The length converter below handles miles, kilometres, metres, feet, inches, and more — convert any distance in any direction with one tool.