Convert km/h, mph, m/s, knots, Mach and more.
| km/h | mph |
|---|---|
| 1 | 0.62137119 |
| 5 | 3.106856 |
| 10 | 6.2137119 |
| 25 | 15.53428 |
| 50 | 31.06856 |
| 100 | 62.137119 |
| 1000 | 621.37119 |
| mph | km/h |
|---|---|
| 1 | 1.609344 |
| 5 | 8.04672 |
| 10 | 16.09344 |
| 25 | 40.2336 |
| 50 | 80.4672 |
| 100 | 160.9344 |
| 1000 | 1,609.344 |
| m/s | km/h |
|---|---|
| 1 | 3.6 |
| 5 | 18 |
| 10 | 36 |
| 25 | 90 |
| 50 | 180 |
| 100 | 360 |
| 1000 | 3,600 |
| kn | km/h |
|---|---|
| 1 | 1.852 |
| 5 | 9.26 |
| 10 | 18.52 |
| 25 | 46.3 |
| 50 | 92.6 |
| 100 | 185.2 |
| 1000 | 1,852 |
| Unit | Symbol | Equals |
|---|---|---|
| Meters per second | m/s | base unit |
| Kilometers per hour | km/h | 1 km/h = 0.2777777778 m/s |
| Miles per hour | mph | 1 mph = 0.44704 m/s |
| Knot | kn | 1 kn = 0.5144444444 m/s |
| Feet per second | ft/s | 1 ft/s = 0.3048 m/s |
| Centimeters per second | cm/s | 1 cm/s = 0.01 m/s |
| Mach (sea level, 15 °C) | Ma | 1 Ma = 340.294 m/s |
| Speed of light | c | 1 c = 299,792,458 m/s |
Convert speeds between metric, imperial and nautical units. Use it for speed limits, running pace, wind speeds, aircraft and ships. Enter a value once and see km/h, mph, m/s, knots, ft/s and Mach together.
Planning a trip? Combine it with the length converter and time converter to estimate distances and durations.
Translate speed limits between km/h and mph, such as 100 km/h ≈ 62 mph and 70 mph ≈ 113 km/h.
Knots are one nautical mile per hour; convert to km/h or mph for passage planning.
Compare sprint speeds in m/s, cycling in km/h and wind forecasts in mph or knots.
To turn mph into km/h, multiply by about 1.6. To turn km/h into mph, multiply by about 0.62.
Mach 1 depends on temperature and altitude. This tool uses the speed of sound at sea level and 15 °C (about 340.3 m/s).
Divide the speed in km/h by 1.609344, or multiply by 0.621371. For example, 100 km/h is about 62.14 mph.
Multiply meters per second by 3.6. For example, 10 m/s equals 36 km/h.
A knot is one nautical mile (1,852 m) per hour, roughly 1.852 km/h or 1.15078 mph.
Light travels at exactly 299,792,458 m/s in a vacuum, about 1.079 billion km/h.