What 20 miles means
20 miles (about 32 km) is the longest run in many traditional marathon training plans, usually done two to four weeks before race day.
20 miles in other units
- Kilometers
- 32.1869 km
- Meters
- 32,187 m
- Feet
- 105,600 ft
- Yards
- 35,200 yd
- Nautical miles
- 17.38 nmi
How long does 20 miles take?
| Activity (average speed) | Time (h:mm:ss) |
|---|---|
| Walking (3 mph / 4.8 km/h) | 6:40:00 |
| Running (10:00 min/mile) | 3:20:00 |
| Cycling (12 mph / 19.3 km/h) | 1:40:00 |
| Driving (60 mph / 97 km/h) | 20:00 |
| Driving (100 km/h / 62 mph) | 19:19 |
Times are simple averages at a constant speed, without stops.
How it's calculated
20 mi × 1.609344 = 32.18688 km
The international mile is defined as exactly 1,609.344 meters, so multiplying by 1.609344 gives an exact result. For a quick mental estimate, multiply by 1.6 (or add 60%).
Nearby conversions
| Miles | Kilometers |
|---|---|
| 10 mi | 16.0934 km |
| 15 mi | 24.1402 km |
| 18 mi | 28.9682 km |
| 22 mi | 35.4056 km |
| 25 mi | 40.2336 km |
| 30 mi | 48.2803 km |
| 40 mi | 64.3738 km |