100 km/h in mph
100 ÷ 1.609344 = 62.14 mph
Speed Converter
Convert km/h, mph, meters per second, feet per second and knots.
Result
1 kilometers per hour (km/h) equals
0.6213711922mph
1 km/h = 0.6213711922 mph
1 km/h in every speed unit
| Unit | Value |
|---|---|
| Meters per second (m/s) | 0.2777777778 |
| Kilometers per hour (km/h) | 1 |
| Miles per hour (mph) | 0.6213711922 |
| Feet per second (ft/s) | 0.9113444153 |
| Knot (kn) | 0.5399568035 |
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How the Speed Converter works
Enter a speed and choose the units — kilometers per hour, miles per hour, meters per second, feet per second or knots. The result updates as you type, with every unit listed below it.
All units are defined in meters per second. Because a mile is exactly 1,609.344 m, one mile per hour is exactly 1.609344 km/h; a knot is one nautical mile (1,852 m) per hour.
Common conversions
Kilometers per hour to miles per hour
| Kilometers per hour (km/h) | Miles per hour (mph) |
|---|---|
| 10 km/h | 6.2137 mph |
| 30 km/h | 18.6411 mph |
| 50 km/h | 31.0686 mph |
| 60 km/h | 37.2823 mph |
| 80 km/h | 49.7097 mph |
| 100 km/h | 62.1371 mph |
| 110 km/h | 68.3508 mph |
| 120 km/h | 74.5645 mph |
| 130 km/h | 80.7783 mph |
Miles per hour to kilometers per hour
| Miles per hour (mph) | Kilometers per hour (km/h) |
|---|---|
| 10 mph | 16.0934 km/h |
| 20 mph | 32.1869 km/h |
| 30 mph | 48.2803 km/h |
| 40 mph | 64.3738 km/h |
| 50 mph | 80.4672 km/h |
| 60 mph | 96.5606 km/h |
| 70 mph | 112.6541 km/h |
| 80 mph | 128.7475 km/h |
Meters per second to kilometers per hour
| Meters per second (m/s) | Kilometers per hour (km/h) |
|---|---|
| 1 m/s | 3.6 km/h |
| 5 m/s | 18 km/h |
| 10 m/s | 36 km/h |
| 20 m/s | 72 km/h |
| 50 m/s | 180 km/h |
| 100 m/s | 360 km/h |
Knots to kilometers per hour
| Knot (kn) | Kilometers per hour (km/h) |
|---|---|
| 1 kn | 1.852 km/h |
| 5 kn | 9.26 km/h |
| 10 kn | 18.52 km/h |
| 20 kn | 37.04 km/h |
| 30 kn | 55.56 km/h |
| 50 kn | 92.6 km/h |
Formula
result = value × ffrom ÷ fto
Where:
- ffrom
- Size of the starting unit in the base unit (1 km/h = 1 ÷ 3.6 m/s, 1 mph = 0.44704 m/s)
- fto
- Size of the target unit in the same base unit
Shortcut between the metric units: km/h = m/s × 3.6, because an hour has 3,600 seconds and a kilometer has 1,000 meters.
Examples
10 m/s in km/h
10 × 3.6 = 36 km/h
30 knots in km/h
30 × 1.852 = 55.56 km/h
Frequently asked questions
What is a knot?
One nautical mile per hour: 1.852 km/h or about 1.15 mph. It's used for ships, aircraft and wind speed.
Why isn't Mach included?
Mach is a ratio to the speed of sound, which changes with air temperature (about 343 m/s at 20 °C, less at altitude). It has no single fixed value, so it can't be converted exactly.
Is kph the same as km/h?
Yes. “kph” is an informal abbreviation; km/h is the standard symbol.
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