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Speed Converter

Velocity - walking pace to the speed of sound.

Speed

Enter a value above to convert between km/h and mph.

100 km/h equals
meter/second27.77777778m/s
kilometer/hour100km/h
mile/hour62.13711923mph
foot/second91.13444154ft/s
knot53.99568035kn
mach (STP)0.08162972Ma

How to convert speed units

Speed is based on the meter per second. The handy rule is km/h = m/s × 3.6. For imperial speed, mph = km/h ÷ 1.609344 because one mile is 1.609344 km. A knot is one nautical mile per hour, which equals 1.852 km/h.

Worked example

To convert 60 mph to km/h: 60 × 1.609344 = 96.56 km/h. Going the other way, 100 km/h is 100 ÷ 1.609344 = 62.14 mph, and 10 m/s is 10 × 3.6 = 36 km/h.

How fast is 60 mph in km/h?

Sixty miles per hour equals 96.56 km/h. One meter per second equals 3.6 km/h, one mile per hour equals 1.609344 km/h (0.44704 m/s), and one knot equals 1.852 km/h. The speed of sound at sea level (Mach 1) is about 340.29 m/s, or roughly 1,225 km/h.

When you'll use a speed converter

Speed conversion is useful for driving abroad (mph and km/h), running and cycling pace, aviation and sailing (knots and mach), and physics. The table above lists your value in all 6 supported units at once.