Speed conversion calculator
Convert speed between metric (m/s, km/h), imperial (mph, ft/s), nautical (knots), and scientific units (mach, speed of light). Compare your speed to cars, planes, animals, and physical constants.
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Frequently Asked Questions
How do I convert km/h to m/s?
Divide by 3.6. For example, 120 km/h = 120 ÷ 3.6 = 33.33 m/s.
What is Mach 1?
Mach 1 is the speed of sound in air at sea level, approximately 343.2 m/s or 1,235 km/h.
How fast is the speed of light?
The speed of light in vacuum is 299,792,458 m/s (about 1.08 billion km/h).
What is a knot?
A knot is one nautical mile per hour, equal to 1.852 km/h or 0.514 m/s. It is used in aviation and maritime navigation.
