Miles per Hour to Meters per Second
Convert miles per hour (mph) to meters per second (m/s). Both measure velocity, and the conversion comes up in driving, aviation, sports work.
The Formula
``
meters per second = miles per hour × 0.44704
miles per hour = meters per second × 2.23693629205
`
One miles per hour is 0.44704 meters per second, and one meters per second is 2.2369 miles per hour.
Conversion Table
| Miles per Hour | Meters per Second |
|---|---|
| 1 mph | 0.44704 m/s |
| 2 mph | 0.89408 m/s |
| 5 mph | 2.2352 m/s |
| 10 mph | 4.4704 m/s |
| 25 mph | 11.176 m/s |
| 50 mph | 22.352 m/s |
| 100 mph | 44.704 m/s |
| 500 mph | 223.52 m/s |
| 1,000 mph | 447.04 m/s |
The Other Direction
| Meters per Second | Miles per Hour |
|---|---|
| 1 m/s | 2.2369 mph |
| 2 m/s | 4.4739 mph |
| 5 m/s | 11.1847 mph |
| 10 m/s | 22.3694 mph |
| 25 m/s | 55.9234 mph |
| 50 m/s | 111.8468 mph |
| 100 m/s | 223.6936 mph |
| 500 m/s | 1,118.47 mph |
| 1,000 m/s | 2,236.94 mph |
What Each Unit Is
Miles per Hour (mph) — miles travelled per hour, equal to 1.609344 km/h exactly. The road-speed unit of the US and UK.
Meters per Second (m/s) — the SI unit of speed — metres travelled per second. The coherent SI derived unit, used throughout physics and engineering.
A Sense of Scale
Residential limits are 25–30 mph- US freeways are 65–75 mph
- A jog is 6 mph
- Walking is 1.4 m/s
- A sprinter peaks near 12 m/s
- Sound travels at 343 m/s
Doing It in Your Head
Multiply by 4, then divide by 9. That is off by 0.58% — close enough to judge a
distance, a weight or a price, and not close enough to sign off on a drawing.
Exact Mental shortcut 4.4704 m/s 4.4444 m/s 44.704 m/s 44.4444 m/s
Precision
The factor 0.44704 is rounded. For engineering work carry more digits than the table above, and round only at the end — rounding at each step compounds.
In Code
`javascript
const milePerHourToMeterPerSecond = (value) => value * 0.44704;
``
Where This Conversion Comes Up
- Driving
- Aviation
- Sports
- Shipping
- Weather
How Many Decimals Do You Need?
Rounding the factor costs accuracy, and how much depends on the factor. Converting 137 mph with the factor truncated at each decimal place:
| Decimals kept | Factor | 137 mph becomes | Error |
|---|---|---|---|
| 0 | 0 | 0 | 100.0000% |
| 1 | 0.4 | 54.8 | 10.5225% |
| 2 | 0.45 | 61.65 | 0.6621% |
| 3 | 0.447 | 61.239 | 0.0089% |
| 4 | 0.447 | 61.239 | 0.0089% |
The right number of significant figures is set by your input, not by the converter. If you measured miles per hour to three significant figures, the answer in meters per second is only good to three — writing more digits claims precision the measurement never had.