Speed Converter
Convert between m/s, km/h, mph, knots, and feet per second instantly.
How to Use the Speed Converter
Select your source and target speed units, enter a value, and see the conversion instantly. Useful for physics, travel, sports, and navigation.
Speed Units Explained
- Meter per Second (m/s): The SI unit of speed. Used in physics and science.
- Kilometer per Hour (km/h): The most widely used speed unit for vehicles worldwide.
- Mile per Hour (mph): Standard speed unit for vehicles in the US and UK.
- Knot (kn): Equal to 1 nautical mile per hour (1.852 km/h). Used in maritime and aviation.
- Foot per Second (ft/s): Used in some engineering and ballistics applications.
Key Speed References
- Walking speed: ~5 km/h (3.1 mph)
- City speed limit: 50 km/h (31 mph)
- Highway speed: 100-120 km/h (62-75 mph)
- Speed of sound: 343 m/s (1,235 km/h)
Speed Conversion Example
Convert 100 km/h to miles per hour:
- 1 km/h = 0.621371 mph
- 100 km/h = 100 × 0.621371 = 62.137 mph
Similarly, to convert 60 mph to m/s: 60 × 0.44704 = 26.822 m/s.
Frequently Asked Questions
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Multiply km/h by 0.621371 to get mph. For a quick estimate, multiply by 0.6. For example, 100 km/h is approximately 62 mph.
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A knot is a unit of speed equal to one nautical mile per hour (1.852 km/h or 1.151 mph). It is used in maritime and aviation to measure the speed of vessels and aircraft.
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The speed of sound in air at 20°C is approximately 343 meters per second (1,235 km/h or 767 mph). This is known as Mach 1.
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Speed is a scalar quantity measuring how fast an object moves. Velocity is a vector quantity that includes both speed and direction. A car going 60 km/h north has the same speed as one going 60 km/h south, but different velocities.
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Multiply meters per second by 3.6 to get km/h. For example, 10 m/s = 36 km/h.