The factor
km = miles × 1.609344. The international mile is 1,760 yards of 0.9144 m each, 1,609.344 m, so the factor is exact. Multiplying by 1.6 is a fair estimate, 0.6% low. Fibonacci numbers give another: 5 miles is about 8 km, and 8 miles about 13.
Running and driving distances
Rounded to two decimal places:
| Miles | Kilometres |
|---|---|
| 1 mi | 1.61 km |
| 3.1 mi | 4.99 km |
| 5 mi | 8.05 km |
| 6.2 mi | 9.98 km |
| 10 mi | 16.09 km |
| 13.1 mi | 21.08 km |
| 26.2 mi | 42.16 km |
| 100 mi | 160.93 km |
A marathon is defined as 42.195 km, which is 26.2188 miles; 26.2 miles comes out about 30 m short.
Questions
How many km/h is 60 mph?
96.56 km/h. The Speed Converter handles speeds both ways.
Is a nautical mile the same?
No. A nautical mile is 1.852 km, about 15% longer, and is used at sea and in the air. It is in the Length Converter.