MPH to M/S Converter
Convert miles per hour to metres per second — the everyday unit into the physics one. Results update as you type; exact factors shown.
One mile per hour is 0.447 metres per second — see the exact factor, not a rounded rule of thumb.
How the mph to m/s converter works
Speeds convert through metres per second. 1 km/h is 1000/3600 m/s; 1 mph is 1609.344/3600 m/s; a knot is one nautical mile (1,852 m) per hour. Mach is shown against the standard sea-level speed of sound of 340.29 m/s and varies with altitude and temperature.
Australia is fully metric under the National Measurement Act 1960; imperial units appear only in trade with the US and in older documents.
Common speed conversions
| From | To | Units |
|---|---|---|
| 1 mph | 0.447 m/s | mile per hour to metres per second |
| 5 mph | 2.2352 m/s | miles per hour to metres per second |
| 10 mph | 4.4704 m/s | miles per hour to metres per second |
| 20 mph | 8.9408 m/s | miles per hour to metres per second |
| 30 mph | 13.4112 m/s | miles per hour to metres per second |
| 40 mph | 17.8816 m/s | miles per hour to metres per second |
| 50 mph | 22.352 m/s | miles per hour to metres per second |
| 60 mph | 26.8224 m/s | miles per hour to metres per second |
| 70 mph | 31.2928 m/s | miles per hour to metres per second |
| 80 mph | 35.7632 m/s | miles per hour to metres per second |
| 100 mph | 44.704 m/s | miles per hour to metres per second |
| 200 mph | 89.408 m/s | miles per hour to metres per second |
Units in this converter and their exact factors
| Unit | Symbol | One unit in metre per seconds |
|---|---|---|
| metre per second | m/s | 1 metre per second |
| kilometre per hour | km/h | 0.2777777778 metre per second |
| mile per hour | mph | 0.44704 metre per second |
| knot | kn | 0.5144444444 metre per second |
| foot per second | ft/s | 0.3048 metre per second |
| Mach (sea level, 15 °C) | Ma | 340.29 metre per second |
FAQFrequently asked questions about speed conversion
How many m/s is 1 mph?
0.44704 m/s exactly.
What is 60 mph in m/s?
26.8 m/s.
Why do physics problems use m/s?
Because it is the SI unit and combines directly with metres and seconds elsewhere.
How fast is terminal velocity?
About 53 m/s for a skydiver, which is 120 mph.
Where these figures come from
- BIPM — The International System of Units (SI Brochure, 9th edition) — definitions of the base and derived units.
- NIST Special Publication 811 — Guide for the Use of the International System of Units — the exact conversion factors used here.
- National Measurement Institute (NMI) — Australia's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.