Speed Converter
A speed converter converts between common speed units: mph, km/h, m/s, knots, and Mach number. Speed is distance per unit time — the SI unit is meters per second (m/s), but km/h and mph are more common in everyday use.
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Tip: To quickly convert km/h to mph: divide by 1.6 (or multiply by 0.625). To go from mph to km/h: multiply by 1.6. 100 km/h ≈ 62 mph.
- 11 mph = 1.60934 km/h = 0.44704 m/s
- 21 km/h = 0.62137 mph = 0.27778 m/s
- 31 knot = 1 nautical mile/hour = 1.852 km/h = 1.15078 mph
- 4Mach 1 ≈ 343 m/s = 1,235 km/h = 767 mph (at sea level, 20°C)
60 mph=96.56 km/h / 26.82 m/sTypical highway speed
100 km/h=62.14 mph / 27.78 m/sEuropean highway limit
| Object/Activity | mph | km/h | m/s |
|---|---|---|---|
| Walking pace | 3.1 | 5 | 1.4 |
| Running (Usain Bolt peak) | 27.8 | 44.8 | 12.4 |
| Car (highway) | 60–80 | 97–129 | 27–36 |
| Speed of sound (sea level) | 767 | 1,235 | 343 |
| Commercial aircraft (cruise) | 575 | 925 | 257 |
| Speed of light | 671 million | 1.08 billion | 299,792,458 |
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Fun Fact
The official land speed record is 763.035 mph (1,228 km/h), set by Andy Green in the Thrust SSC jet car in 1997 — faster than the speed of sound. The car produced shock waves visible on cameras.
References
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