100 km/h = 62.137119 mph · 1 km/h = 0.62137119 mph
In all units: 100 km/h
| Kilometers per hour | 100 km/h |
|---|
| Miles per hour | 62.137119 mph |
|---|
| Meters per second | 27.777778 m/s |
|---|
| Knots | 53.99568 kn |
|---|
| Feet per second | 91.134442 ft/s |
|---|
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How it works
Every unit is stored as its value in meters per second:
| Unit |
In m/s |
Why |
| Kilometers per hour |
1 ÷ 3.6 ≈ 0.27778 |
1,000 m ÷ 3,600 s |
| Miles per hour |
0.44704 |
1,609.344 m ÷ 3,600 s |
| Knots |
0.51444 |
1,852 m ÷ 3,600 s |
| Feet per second |
0.3048 |
1 ft = 0.3048 m |
All of these are exact, because the mile, the nautical mile and the foot are defined in meters.
Examples
- Driving abroad. 100 km/h is 62.14 mph, and 70 mph is 112.65 km/h.
- Town speed limits. 30 mph is 13.41 m/s, or 48.28 km/h.
- Sailing and wind. 20 knots is 37.04 km/h.
- Sprinting. Running 100 m in 9.58 seconds averages 10.44 m/s, which is 37.58 km/h.
- Physics. 60 mph is exactly 88 feet per second.
Quick mental conversions
- km/h → mph: multiply by 0.6, then add a little (100 km/h → 60, real answer 62).
- mph → km/h: multiply by 1.6 (50 mph → 80 km/h, real answer 80.47).
- m/s → km/h: multiply by 3.6 exactly.
Frequently asked questions
How do I convert km/h to mph?+
Divide by 1.609344 (the number of kilometers in a mile), or multiply by about 0.6214. 100 km/h is 62.14 mph.
How do I convert mph to km/h?+
Multiply by 1.609344. A 70 mph motorway limit is 112.65 km/h.
What is a knot?+
One nautical mile per hour, which is exactly 1.852 km/h or about 1.151 mph. Knots are used at sea, in aviation and for wind speed.
How do I convert m/s to km/h?+
Multiply by 3.6, because an hour has 3,600 seconds and a kilometer 1,000 meters. 10 m/s is 36 km/h.
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