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Tap a unit to copy
What the Speed Converter does
This tool converts between common speed units so you can read a foreign speedometer, compare wind or vehicle speeds, or check a running pace. It handles meters per second, kilometers per hour, miles per hour, feet per second, knots, and mach. That makes it handy for travelers driving abroad, students working through physics problems, sailors and pilots using knots, and anyone comparing metric and imperial speeds.
How to use it
- Type the number in the Value box.
- Choose your current unit in the From row (for example km/h).
- Your value appears in every other unit instantly below, with nothing to click.
- Tap any unit (for example mph) to copy its value to your clipboard.
Quick reference
A few handy anchors: 100 km/h is about 62 mph, 1 m/s is 3.6 km/h, and 1 knot is about 1.15 mph. The converter uses exact factors for precise answers, and because the calculation happens locally in your browser, nothing you enter is sent or stored anywhere.
Frequently asked questions
- Which speed units does it support?
- It converts between meters per second (m/s), kilometers per hour (km/h), miles per hour (mph), feet per second (ft/s), knots, and mach. Any pair works, like km/h to mph or m/s to km/h.
- How do I convert km/h to mph?
- Enter the value and pick km/h in the From row. The mph value appears instantly in the results grid, ready to tap and copy. As a rough check, multiply km/h by 0.62 to estimate mph.
- Is the data sent anywhere?
- No. Everything runs in your browser, so your numbers are never uploaded. No account, no limits.
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Last updated: June 17, 2026