How to Convert Metres per second to Miles per hour (m/s to mph)
Speed conversions come up with expressway limits in km/h, foreign car specs in mph and wind speeds reported in knots by the Meteorological Service. This guide shows how to convert metres per second into miles per hour by hand, with examples and a quick-reference table.
The conversion
To convert metres per second to miles per hour, multiply the value by 2.2369362921. To go the other way, divide by the same number (or multiply by 0.44704). For a quick estimate, multiply by about 2.2.
Miles per hour = metres per second × 2.2369362921
Worked examples
- 3 m/s = 6.7108 mph
- 12.5 m/s = 27.9617 mph
- 75 m/s = 167.7702 mph
Metres per second to Miles per hour table
| Metres 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 |
| 20 m/s | 44.7387 mph |
| 25 m/s | 55.9234 mph |
| 50 m/s | 111.8468 mph |
| 100 m/s | 223.6936 mph |
| 250 m/s | 559.2341 mph |
| 500 m/s | 1,118.47 mph |
| 1,000 m/s | 2,236.94 mph |
Common questions
Is m/s to mph exact?
The factors used here are the internationally defined values where they exist; results are rounded for display only.
How do I convert back?
Use the Miles per hour to Metres per second converter.
Mistakes to avoid
Multiplying when you should divide
Converting to a smaller unit gives a bigger number, and converting to a larger unit gives a smaller one. If your answer moves the wrong way, you have inverted the factor.
Forgetting squared and cubed units
Area and volume factors are the length factor squared or cubed, so 1 m² is about 10.76 sq ft, not 3.28.
Rounding the factor too early
Using 3 instead of 3.28 for feet per metre introduces an error of almost 9% before you have started.
Background
For everyday use, three or four significant figures are usually enough. Engineering, science and trade documents may need more, and rounding should happen only at the end of a calculation.
Many conversion factors are exact by definition. The inch has been defined as exactly 2.54 centimetres since 1959, and the pound as exactly 0.45359237 kilograms, so conversions involving them can be as precise as you need.
A conversion table is handy for common values, but a calculator is faster and avoids interpolation errors for anything in between.
For any value, use the Metres per second to Miles per hour Converter or browse all speed converters.
Run your own numbers: Metres per second to Miles per hour Converter