Speed Converter
Convert between meters per second, kilometers per hour, miles per hour, and more
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Conversion Formula:
Multiply by 0.621371
Common Conversions
Common Speed Conversions
| km/h | mph | m/s | knots |
|---|---|---|---|
| 10 | 6.21 | 2.78 | 5.40 |
| 50 | 31.07 | 13.89 | 27.00 |
| 100 | 62.14 | 27.78 | 54.00 |
Real-World Speed Comparisons
- Average walking speed: 5 km/h (3.1 mph)
- Average running speed: 12 km/h (7.5 mph)
- Typical city speed limit: 50 km/h (31 mph)
- Highway speed limit: 100 km/h (62 mph)
- High-speed train: 320 km/h (199 mph)
- Commercial airplane cruising speed: 900 km/h (559 mph)
- Speed of sound (at sea level): 1,235 km/h (767 mph)
- Earth's rotation at the equator: 1,670 km/h (1,037 mph)
- International Space Station: 27,600 km/h (17,150 mph)
- Earth orbiting the Sun: 107,000 km/h (66,486 mph)
Speed Measurement Facts
- The official SI unit for speed is meters per second (m/s)
- Traffic speed limits are commonly displayed in kilometers per hour (km/h) or miles per hour (mph)
- Knots are used for maritime and aircraft speeds (1 knot = 1 nautical mile per hour)
- Mach number represents speed relative to the speed of sound in the medium
- Wind speeds in weather forecasts are often given in kilometers per hour, miles per hour, or knots
- Speed radars used by law enforcement typically measure in km/h or mph
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Visual Comparison
Interactive Speed Visualization
This visualization shows the relative speed of different objects. The object shown is based on the closest match to your input speed.
Try different speed values to see how they compare to everyday objects and phenomena.
Mobile tip: Swipe left or right on the unit dropdown to quickly change units, or use the arrow buttons
About the Speed Converter
Convert between meters per second, kilometers per hour, miles per hour, and more All conversions run instantly in your browser and nothing you enter is sent to a server.
Common Conversion Formulas
| From | To | Formula |
|---|---|---|
| Miles per hour (mph) | Kilometers per hour (km/h) | km/h = mph × 1.60934 |
| Meters per second (m/s) | Kilometers per hour (km/h) | km/h = m/s × 3.6 |
| Knots (kn) | Miles per hour (mph) | mph = kn × 1.15078 |
Related calculators
- Speed Distance Time CalculatorCalculate speed, distance or time from the other two. Works in mph, km/h, m/s and knots with any mix of units.
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- Gear Ratio CalculatorCalculate gear ratio from tooth counts with output speed and torque, or find vehicle speed from engine RPM, axle ratio and tire diameter.