Speed converter
Pick two speed units and type a number. One mile per hour is exactly 1.609344 km/h and 0.44704 m/s; one knot is one nautical mile per hour, 1.852 km/h.
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1 mile per hour =
1.60934km/h
Formula: km/h = mph × 1.609344
Show the steps
- Definition: 1 mph = 1.609344 km/h = 0.44704 m/s exactly; 1 km/h = 1000 m / 3600 s
- 1 mph × 1.609344 = 1.60934 km/h
Definitions used: 1 mph = 1.609344 km/h = 0.44704 m/s exactly; 1 km/h = 1000 m / 3600 s.
Source: NIST SP 811, Appendix B.8, checked on .
1 mile per hour in every speed unit
| Unit | Value |
|---|---|
| Kilometers per hour (km/h) | 1.60934 |
| Meters per second (m/s) | 0.44704 |
| Feet per second (ft/s) | 1.46667 |
| Knots (kn) | 0.868976 |
The table follows the amount and the “From” unit you set in the converter above.
Popular speed conversions
How each speed unit is defined
These are the definitions the converter uses, as written in the source next to each one. Nothing is rounded before the calculation.
| Unit | Definition | In meters per second |
|---|---|---|
| Mile per hour (mph) | 1 mph = 1.609344 km/h = 0.44704 m/s exactly | 0.44704 |
| Kilometer per hour (km/h) | 1 km/h = 1000 m / 3600 s | 0.2777777778 |
| Meter per second (m/s) | SI unit of speed | 1 |
| Foot per second (ft/s) | 1 ft/s = 0.3048 m/s exactly | 0.3048 |
| Knot (kn) | 1 knot = 1 nautical mile per hour = 1.852 km/h | 0.5144444444 |
Speed conversion questions
How do I convert km/h to m/s?
Divide by 3.6. 36 km/h is 10 m/s, because an hour has 3,600 seconds and a kilometer 1,000 meters.
How fast is a knot?
One knot is 1.852 km/h, or about 1.151 mph.
What is 100 km/h in mph?
100 km/h is 62.14 mph.
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Sources and limits
- NIST SP 811, Appendix B.8
NIST Special Publication 811, Guide for the Use of the SI, Appendix B.8: Factors for Units Listed Alphabetically (page updated August 18, 2025).
National Institute of Standards and Technology. Edition or effective date: . Text in force when checked on .
This is a calculation aid, not an official measurement service. Results are rounded to 6 significant digits for display. For trade, engineering, medical dosing or legal documents, confirm the figure in the official source. Nothing you type leaves your browser.