Convert between km/h, mph, m/s, and knots.
Free to use, no sign-up required. Speed Converter is one of 198 tools built into Xenition, alongside a chat that can use them for you.
Converts speed between m/s, km/h, mph, ft/s, knots and Mach. People use it for road speed limits abroad, wind speeds in forecasts, boat and aircraft speeds, and physics homework.
Every unit is stored in metres per second: 1 km/h = 0.2777778 m/s, 1 mph = 0.44704 m/s, 1 knot = 0.5144444 m/s. Mach is treated as a fixed 340.29 m/s, the speed of sound in air at sea level at 15 °C.
A 100 km/h speed limit is 62.137124 mph. A 30-knot boat is doing 55.559991 km/h.
The speed of sound depends on air temperature, so it falls with altitude. The tool uses the sea-level standard of 340.29 m/s (about 1,225 km/h); at a jet’s cruising height Mach 1 is closer to 295 m/s.
One nautical mile (1,852 m) per hour. Ships, aircraft and marine weather forecasts use knots.
Speed Converter converts between 6 units: km/h, ft/s, mph, knot, m/s and mach. Factors are given against m/s.
| Unit | In m/s | 1 m/s equals |
|---|---|---|
| 1 km/h | 0.2777778 m/s | 3.599999712 km/h |
| 1 ft/s | 0.3048 m/s | 3.280839895 ft/s |
| 1 mph | 0.44704 m/s | 2.2369362921 mph |
| 1 knot | 0.5144444 m/s | 1.9438446604 knot |
| 1 mach | 340.29 m/s | 0.00293867 mach |
Common quantities in m/s, converted. Every value is computed from the factors above, so the chart and the converter cannot disagree.
| m/s | km/h | ft/s | mph | knot |
|---|---|---|---|---|
| 1 m/s | 3.599999712 | 3.280839895 | 2.2369362921 | 1.9438446604 |
| 2 m/s | 7.199999424 | 6.56167979 | 4.4738725841 | 3.8876893208 |
| 5 m/s | 17.99999856 | 16.4041994751 | 11.1846814603 | 9.7192233019 |
| 10 m/s | 35.99999712 | 32.8083989501 | 22.3693629205 | 19.4384466038 |
| 25 m/s | 89.9999928 | 82.0209973753 | 55.9234073014 | 48.5961165094 |
| 100 m/s | 359.9999712 | 328.0839895013 | 223.6936292054 | 194.3844660375 |
1 m/s is 3.599999712 km/h. To convert m/s to km/h, divide by 0.2777778 — so 10 m/s is 35.99999712 km/h.
1 km/h is 0.2777778 m/s. To convert km/h to m/s, multiply by 0.2777778 — so 10 km/h is 2.777778 m/s.
1 m/s is 3.280839895 ft/s. To convert m/s to ft/s, divide by 0.3048 — so 10 m/s is 32.8083989501 ft/s.
1 ft/s is 0.3048 m/s. To convert ft/s to m/s, multiply by 0.3048 — so 10 ft/s is 3.048 m/s.
1 m/s is 2.2369362921 mph. To convert m/s to mph, divide by 0.44704 — so 10 m/s is 22.3693629205 mph.
1 mph is 0.44704 m/s. To convert mph to m/s, multiply by 0.44704 — so 10 mph is 4.4704 m/s.
1 m/s is 1.9438446604 knot. To convert m/s to knot, divide by 0.5144444 — so 10 m/s is 19.4384466038 knot.
1 knot is 0.5144444 m/s. To convert knot to m/s, multiply by 0.5144444 — so 10 knot is 5.144444 m/s.
You do not have to open Speed Converter to use it. Ask Xenition in plain language and it runs the right tool, then carries the answer into whatever you are working on — a document, a spreadsheet, a deck.