About & methodology
Miles to KM is a small, independent collection of free converters and calculators for people who move between miles and kilometers: runners following international races, drivers renting a car abroad, and anyone reading a spec sheet from another country.
Methodology
All length and speed conversions use exact definitions from the 1959 international yard and pound agreement, as published by the U.S. National Institute of Standards and Technology (NIST Handbook 44 / SP 811):
- 1 inch = 2.54 cm (exact) · 1 foot = 0.3048 m (exact)
- 1 mile = 1,760 yards = 5,280 feet = 1,609.344 m (exact)
- 1 nautical mile = 1,852 m (exact) · 1 pound = 0.45359237 kg (exact)
- 1 US gallon = 3.785411784 L · 1 imperial gallon = 4.54609 L
Race distances follow World Athletics: marathon 42.195 km, half marathon 21.0975 km. Results are calculated in full precision and rounded only for display. Estimates that depend on personal factors (stride length, vehicle efficiency, traffic) are labeled as estimates.
Corrections
Found an error? Please write to [email protected] — we fix mistakes quickly.