Convert m/s, km/h, mph, knots, Mach and speed of light. Speed Converter is a free online tool from the ToolsRift Unit Converters collection. It runs entirely in your browser — nothing to install, no signup, and your data never leaves your device.
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How to use Speed Converter
Open the Speed Converter above — it loads instantly, no account needed.
Enter or upload your input. Everything is processed locally on your device.
Get your result immediately and copy or download it with one click.
Frequently asked questions
How do I convert km/h to mph?
Divide km/h by 1.60934, or multiply by 0.62137. So 100 km/h ≈ 62.14 mph.
What is a knot in km/h?
1 knot (nautical mile per hour) = 1.852 km/h = 1.15078 mph.
What speed is Mach 1?
Mach 1 is the local speed of sound, about 1,225 km/h (761 mph) at sea level and 15°C — it varies with altitude and temperature.
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