Units & Numbers Tools
Speed Converter
Convert between km/h, mph, knots, m/s, and more.
Loading tool…
What is Speed?
A speed converter covering the units used in driving, running, meteorology, and aviation, including knots and Mach.
How it works
Units normalize to meters per second; Mach uses a standard sea-level speed of sound for the conversion.
- Enter your input. Type or paste your input into the field above — the tool responds instantly.
- Review the result. Output updates live as you type. Everything runs entirely in your browser.
- Copy or download. Use the Copy button to grab the result, or Download to save it as a file.
Examples
Running pace to speed
A 5:30 per km pace is 10.9 km/h or 6.8 mph — convert between pace, speed, and knots in one tool.
Common mistakes
Knots vs mph in travel
Aviation and marine speeds use knots (nautical miles per hour), which are faster than mph — 1 knot ≈ 1.151 mph.
Frequently asked questions
Which units are supported?
m/s, km/h, mph, knots, and feet per second — plus pace formats like min/km and min/mile.
How do I convert pace to speed?
Enter pace as mm:ss per km or mile and the tool computes the equivalent speed in your chosen unit.
Is the conversion precise?
Yes — all factors are exact definitions; results are rounded only for display.