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Speed Converter

20 conversions available

Convert between km/h, mph, m/s, knots and more.

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Kilometers per Hour → Miles per Hour Kilometers per Hour → Meters per Second Kilometers per Hour → Feet per Second Kilometers per Hour → Knots Miles per Hour → Kilometers per Hour Miles per Hour → Meters per Second Miles per Hour → Feet per Second Miles per Hour → Knots Meters per Second → Kilometers per Hour Meters per Second → Miles per Hour Meters per Second → Feet per Second Meters per Second → Knots Feet per Second → Kilometers per Hour Feet per Second → Miles per Hour Feet per Second → Meters per Second Feet per Second → Knots Knots → Kilometers per Hour Knots → Miles per Hour Knots → Meters per Second Knots → Feet per Second

Most popular speed conversions

The most searched speed conversion is mph to km/h (and back), essential for anyone driving between countries that use different systems. 60 mph equals about 97 km/h, while 100 km/h is roughly 62 mph. Meters per second to km/h is common in science and sports, and knots appear in aviation and sailing.

Understanding speed units

Speed combines distance and time. Most countries post limits in kilometers per hour, while the US and UK use miles per hour. Meters per second is the scientific standard, and knots (nautical miles per hour) are used at sea and in the air. Converting between mph and km/h is by far the most frequent everyday need.

Quick reference

1 mph = 1.609 km/h · 1 km/h = 0.621 mph · 60 mph = 96.6 km/h · 100 km/h = 62.1 mph · 1 m/s = 3.6 km/h · 1 knot = 1.852 km/h. For a quick mental estimate, multiply km/h by 0.6 to get mph.

Quick reference: common speed conversions

1 mph 1.609 km/h
100 km/h 62.1 mph
1 knot 1.852 km/h (1.151 mph)
1 m/s 3.6 km/h
Mach 1 (sea level) ~1,225 km/h
30 mph 48.3 km/h
70 mph 112.7 km/h
10 m/s 36 km/h (22.4 mph)

Frequently asked questions

Why do planes and ships measure speed in knots?

A knot is one nautical mile per hour, and a nautical mile is one minute of latitude on navigation charts — the direct link to coordinates makes course and distance math simpler.

How do I convert km/h to mph in my head?

Multiply by 0.6. So 120 km/h is about 72 mph. Going the other way, 60 mph is roughly 100 km/h — a handy driving anchor.

What does Mach 1 mean?

The local speed of sound — about 1,225 km/h at sea level, dropping to roughly 1,060 km/h at cruise altitude because sound travels slower in colder air.