Speed Converter
Converts speeds exactly between m/s, km/h, mph, knots and ft/s, with an optional pace mode (minutes per km or mile).
Convert speed
Exact definitions (NIST SP 811) · rounded at display only
10 m/s =
36km/h
exact
How this was converted
- Read as: 10
- The SI unit of speed.
- 1 km/h = 1000 m ÷ 3600 s = 1/3.6 m/s exactly.
- result = amount × (m/s in m/s) ÷ (km/h in m/s)
- In m/s (exact): 10
Pace (time per distance)
- Minutes per km
- 1:40
- Minutes per mile
- 2:41
Scalar conversion only — no allowance for wind, current, or ground versus air speed.
All units
| Unit | Value | Actions |
|---|---|---|
| Metres per second (m/s) | 10 m/s | |
| Kilometres per hour (km/h) | 36 km/h | |
| Miles per hour (mph) | 22.36936292 mph≈ | |
| Knots (kn) | 19.43844492 kn≈ | |
| Feet per second (ft/s) | 32.80839895 ft/s≈ |
≈ marks a value rounded for display. ☆ pins a unit to the top for this visit (nothing is stored).
Exact unit definitions
| Unit | 1 unit in m/s (exact) |
|---|---|
| Metres per second (m/s) | The SI unit of speed. |
| Kilometres per hour (km/h) | 1 km/h = 1000 m ÷ 3600 s = 1/3.6 m/s exactly. |
| Miles per hour (mph) | 1 mph = 1609.344 m ÷ 3600 s = 0.44704 m/s exactly. |
| Knots (kn) | 1 knot = 1 nautical mile per hour = 1852 m ÷ 3600 s exactly (≈ 0.514444 m/s). |
| Feet per second (ft/s) | 1 ft/s = 0.3048 m/s exactly (international foot). |
How to use this calculator
- Type a speed (a minus sign is allowed for a signed velocity) or choose a pace unit and enter minutes per km or mile, such as 5:30.
- Choose the unit you want; Swap reverses the units and keeps what you typed.
- Read the result, the pace cards and the all-units table; copy one value or all of them.
How it works
Everything goes through metres per second with exact factors: km/h ÷ 3.6, mph × 1609.344/3600 (0.44704 m/s), knots × 1852/3600 and ft/s × 0.3048.
Pace is time per distance: minutes per km = 1000 ÷ (speed in m/s × 60). It is defined only for a positive speed — at zero speed it is undefined, and a negative value is treated as a signed velocity with no pace.
These are scalar conversions: they do not allow for wind, current, or ground speed versus air or water speed.
Worked example
10 m/s. 10 m/s × 3.6 = 36 km/h exactly; 10 ÷ 0.44704 = 22.36936292 mph; 10 × 3600 ÷ 1852 = 19.43844492 knots (both rounded to 10 significant figures). As a pace that is 1:40 per km. Going the other way, a pace of 60 min/km is exactly 1 km/h.
Frequently asked questions
Speed or pace — what is the difference?
Speed is distance per time (km/h); pace is time per distance (minutes per km). They are reciprocals, so pace has its own mode here and appears in separate cards rather than in the speed table.
Is a knot exact?
Yes. A knot is one international nautical mile (exactly 1852 m) per hour, so 1 kn = 1852/3600 m/s exactly (about 0.514444 m/s, displayed rounded).
Why is pace undefined at zero speed?
Pace divides time by distance covered. At zero speed no distance is covered, so the time per kilometre would be infinite — the tool says “undefined” instead of printing a number.
Does it work offline and stay private?
Yes — the conversion runs entirely in your browser, with no sign-up and nothing sent to a server.
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Explore more in Units, Measurement & Converters.
Cite this tool
Zerdly. (2026). Speed Converter. Retrieved from https://www.zerdly.com/tools/speed-converter/
Tip: Enter any known values to calculate the remaining results.
Designed to run locally in your browser. Tool inputs are not intentionally stored by Zerdly unless stated otherwise.