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Convert between mph, km/h, m/s, knots, and ft/s with quick reference tables.
Speed is a measure of how fast an object moves, expressed as distance traveled per unit of time. Common units include miles per hour (mph), kilometers per hour (km/h), and meters per second (m/s).
| Description | mph | km/h | m/s |
|---|---|---|---|
| Walking | 3 | 4.8 | 1.3 |
| Cycling | 15 | 24 | 6.7 |
| City driving | 30 | 48 | 13.4 |
| Highway | 65 | 105 | 29.1 |
| High-speed rail | 186 | 300 | 83.3 |
| Speed of sound | 767 | 1,235 | 343 |
Multiply by 1.60934 to convert miles per hour to kilometers per hour.
km/h = mph × 1.60934
Divide by 3.6 to convert kilometers per hour to meters per second.
m/s = km/h ÷ 3.6
1 knot = 1 nautical mile per hour = 1.852 km/h = 1.151 mph.
Formula
km/h = mph × 1.60934 | m/s = km/h ÷ 3.6 | kn = mph × 0.868976mph = miles per hour — US/UK road speed standard
km/h = kilometers per hour — international road speed standard
m/s = meters per second — SI unit of speed used in physics
kn = knot — 1 nautical mile per hour (1.852 km/h), used in aviation and maritime navigation
Worked Example
Convert 60 mph to km/h, m/s, and knots
Did you know? The speed of sound (Mach 1) is 343 m/s at 20°C sea level — but it varies with temperature and altitude. At 35,000 ft where airliners cruise, Mach 1 drops to about 295 m/s (574 knots).
Sources
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