Speed Converter

km/h, mph, m/s, knots and ft/s at a glance. Convert speed units instantly: kilometres per hour, miles per hour, metres per second, knots and feet per second. Free speed converter for driving, running and aviation.

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Sobre o Speed Converter

Car speedometers read km/h or mph depending on the country, physics uses m/s, aviation uses knots, and ballistics uses ft/s. This converter covers all five from one input: type a value, pick its unit, and every other unit appears instantly — 100 km/h is 62.14 mph, 27.78 m/s and about 54 knots. Handy for driving abroad, reading research papers and decoding weather reports.

Como usar o Speed Converter

Enter your speed value.
Choose the unit it is in.
Read all other speed units instantly.
Swap units to reverse the conversion.

Principais recursos

km/h, mph, m/s, knots and ft/s
Instant full table from one input
Exact conversion factors
Swap button for quick reversal

How fast is 100 km/h in mph?

62.14 mph. Multiply km/h by 0.621371 — or just read it here.

Why do planes use knots?

Knots are nautical miles per hour, and nautical miles map directly onto latitude minutes — making navigation calculations natural.

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