MPH to m/s Converter
Convert miles per hour and meters per second in either direction.
Exact: 1 mph = 0.44704 m/s.
MPH to m/s formula
m/s = mph × 0.44704. In other words, 1 mph = 0.44704 m/s exactly, because 1 mile = 1,609.344 m and 1 hour = 3,600 s.
Step-by-step unit cancellation
Start with miles per hour, replace the mile with meters, then replace the hour with seconds. The mile and hour units cancel:
20 mi/h × (1,609.344 m ÷ 1 mi) × (1 h ÷ 3,600 s) = 8.9408 m/s
For the reverse direction, use mph = m/s ÷ 0.44704. The calculator uses the exact factor rather than a rounded reciprocal.
Common mph to m/s examples
| Miles per hour | Meters per second |
|---|---|
| 15 mph | 6.7056 m/s |
| 20 mph | 8.9408 m/s |
| 30 mph | 13.4112 m/s |
| 45 mph | 20.1168 m/s |
| 50 mph | 22.352 m/s |
| 60 mph | 26.8224 m/s |
Full value and significant figures
The main result starts with a clean calculator value of up to 15 significant digits, avoiding meaningless floating-point tails. If a report or measurement requires controlled rounding, select 2–6 significant figures yourself. Changing the display does not change the exact conversion factor or the underlying result.
Accepted input and scope
Enter a complete, finite, nonnegative number. Zero and decimal values are accepted; negative values, commas, words, and incomplete numbers are rejected with an error. This page converts only mph and m/s, while showing km/h and ft/s as reference values.
Frequently asked questions
How do I convert mph to m/s?
Multiply miles per hour by exactly 0.44704. For example, 20 mph × 0.44704 = 8.9408 m/s.
How do I convert m/s to mph?
Divide meters per second by exactly 0.44704. For example, 8.9408 m/s ÷ 0.44704 = 20 mph.
Is 1 mph exactly 0.44704 m/s?
Yes. The international mile is exactly 1,609.344 meters and one hour is 3,600 seconds, so 1 mph is exactly 1,609.344 ÷ 3,600 = 0.44704 m/s.
Can I control rounding?
Yes. A clean calculator value of up to 15 significant digits is the default. You can explicitly display 2, 3, 4, 5, or 6 significant figures; the converter does not guess a precision from your input.
What other speed units are shown?
Each valid result also shows kilometers per hour (km/h) and feet per second (ft/s). This page stays focused on mph and m/s rather than acting as a general speed converter.