Speed Converter
About Speed Converter
What Is a Speed Converter?
A speed converter transforms velocity measurements between different units. Speed is distance divided by time and can be expressed in many ways depending on context. Road speed uses km/h or mph, maritime and aviation use knots, science uses m/s, and aerospace uses Mach numbers. This converter handles all these units and more, making it useful for drivers, pilots, sailors, athletes, engineers, and scientists.
Common Speed Conversions
Key factors: 1 mph = 1.60934 km/h, 1 km/h = 0.277778 m/s, 1 knot = 1.852 km/h = 1.15078 mph, 1 m/s = 3.6 km/h, Mach 1 = 343 m/s = 1,235 km/h (at sea level in dry air at 20C). Mach number varies with altitude and temperature because it depends on the speed of sound.
How to Use This Converter
Enter a speed value, select the source unit and target unit, and click Convert. The result displays the converted speed with a full comparison table of all units.
Frequently Asked Questions
How do I convert km/h to mph?
Divide the km/h value by 1.60934, or multiply by 0.621371. Example: 100 km/h = 62.14 mph.
What is a knot?
A knot is one nautical mile per hour (1.852 km/h). It is the standard speed unit in maritime and aviation because it relates directly to degrees of latitude, simplifying navigation.
What is Mach 1?
Mach 1 is the speed of sound, approximately 343 m/s or 1,235 km/h at sea level in dry air at 20C. Mach numbers above 1 are supersonic, above 5 are hypersonic.
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