CALCULATORS & CONVERTERS
Speed Converter — km/h, mph, knots, m/s, ft/s
Convert speed between km/h, mph, knots, metres per second, and feet per second instantly in your browser. Exact factors, no signup.
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1 Meters/second = 2.236936 Miles/hour
Convert a speed between kilometres per hour, miles per hour, knots, metres per second, and feet per second. Useful for reading a foreign speed limit, comparing wind or boat speed in knots, or turning a physics answer in m/s into everyday units.
The factors follow the exact definitions of the underlying length and time units — one mph is exactly 1.609344 km/h, one knot is one nautical mile (1,852 m) per hour, and one m/s is 3.6 km/h.
Frequently asked questions
- How do I convert km/h to mph?
- Divide by 1.609344, or multiply by about 0.621. So 100 km/h is roughly 62 mph, and 50 km/h is about 31 mph.
- What exactly is a knot?
- One nautical mile per hour. A nautical mile is 1,852 metres, so a knot is 1.852 km/h or about 1.15 mph. Knots are standard in sailing and aviation because a nautical mile maps neatly onto one minute of latitude.
- How do I turn m/s into km/h?
- Multiply by 3.6, since an hour has 3,600 seconds and a kilometre has 1,000 metres. So 10 m/s is 36 km/h.
- Which unit do weather forecasts use for wind?
- It varies: marine and aviation forecasts use knots, many public forecasts use km/h or mph, and scientific reports use m/s. This tool lets you move between all of them to compare sources.