Speed Converter
Convert km/h, mph, m/s, knots and ft/s for driving, running and flying.
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How to use Speed Converter
- Enter the speed in the “From” field — for example 120 for 120 km/h.
- Select the unit it is in (Km/hour, Mile/hour, Knot…) from the first dropdown.
- Select the unit you want from the second dropdown — the converted speed appears instantly.
- Click the swap button to reverse the conversion, e.g. mph → km/h becomes km/h → mph.
What is Speed Converter?
A speed converter translates velocity between units — kilometers per hour to miles per hour, meters per second to km/h, or knots to mph. Which unit you meet depends on context: road signs use km/h in most of the world and mph in the US and UK; physics and weather models use meters per second; aviation and sailing use knots.
The relationships are exact: 1 mph = 1.609344 km/h (from the mile), 1 knot = 1.852 km/h (one nautical mile per hour), and 1 m/s = 3.6 km/h exactly — a clean factor that makes m/s the easiest unit to convert in your head.
About the Speed Converter
This converter covers five units — meters per second, kilometers per hour, miles per hour, feet per second and knots — converting between any pair the instant you type.
Real uses: a US car doing 65 mph is at 105 km/h — useful when renting a car abroad; a hurricane reported at 100 knots is blowing 185 km/h (115 mph); a sprinter running 100 m in 10 s averages 10 m/s = 36 km/h; a wind forecast of 15 m/s is a stiff 54 km/h. Anchors: 100 km/h ≈ 62 mph, 1 knot ≈ 1.15 mph, and to turn m/s into km/h just multiply by 3.6.
Everything is computed locally with exact factors — nothing typed here leaves your browser.
Frequently Asked Questions
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How to Convert km/h to mph and Other Speed Units
Driving abroad or reading specs in different units? Here is how to convert between km/h, mph, m/s and knots.
Read the guide