Speed unit converter
km/h, mph, knots and Mach — plus the speed of light for scale.
Precision & format
1 km/h equals
0.6213711922mph
All 10 units
- Kilometer per hourkm/h1
- Mile per hourmph0.6213711922
- Meter per secondm/s0.2777777778
- Foot per secondft/s0.9113444153
- Knotkn0.5399568035
- Centimeter per secondcm/s27.77777778
- Meter per minutem/min16.66666667
- Inch per minutein/min656.167979
- MachMasea level, ISA 15 °C0.0008162972105
- Speed of lightcin vacuum9.265669311 × 10⁻¹⁰
Speed conversion table
Every unit expressed in meter per seconds (m/s), the SI base for this category.
| Unit | Symbol | 1 unit in m/s |
|---|---|---|
| Kilometer per hour | km/h | 0.27777778 |
| Mile per hour | mph | 0.44704 |
| Meter per second | m/s | 1 |
| Foot per second | ft/s | 0.3048 |
| Knot | kn | 0.51444444 |
| Centimeter per second | cm/s | 0.01 |
| Meter per minute | m/min | 0.016666667 |
| Inch per minute | in/min | 0.00042333333 |
| Machsea level, ISA 15 °C | Ma | 340.29 |
| Speed of lightin vacuum | c | 299,792,460 |
