Convert miles per hour to km/h: 10 mph = 16.09 km/h, 100 mph = 160.93 km/h. Includes m/s and nautical knots — free, with formula and table.
Speed measures the rate of change of position over time, and it's one of the few quantities where the context of use completely changes which unit makes sense: kilometres per hour in traffic, metres per second in physics, miles per hour in the United States, and knots in maritime and air navigation — each existing for different historical and practical reasons. The "knot" is the most interesting case: it equals one nautical mile per hour, and the nautical mile, in turn, was mathematically defined from the Earth's own geometry — one minute of arc along a meridian. This makes the knot especially practical for navigation, since it connects directly to the latitude and longitude coordinates used on nautical charts and GPS systems, without needing complex intermediate conversions. This converter calculates precisely between all these units, essential for pilots and sailors (where confusing knots with km/h can have serious navigation consequences), athletes training with imported equipment calibrated in different units, and anyone comparing technical vehicle specifications between markets that use different measurement systems, such as importing a car from the United States with a speedometer set in miles per hour.
Divide the value in km/h by 3.6.
1 mile per hour equals 1.609 km/h.
It is the unit of speed equivalent to one nautical mile per hour (1.852 km/h).
The speed of sound in air is approximately 343 m/s.
No, our converters are unlimited and completely free.
1 km/h ≈ 0.2778 m/s. Divide km/h by 3.6 to convert.
Multiply mph by 1.60934. Example: 60 mph ≈ 96.56 km/h.
1 knot = 1 nautical mile per hour ≈ 1.852 km/h, used in navigation and aviation.
100 km/h ≈ 62.14 mph.