Speed Converter
Convert between speed units instantly. Meters per second, kilometers per hour, miles per hour, knots, and mach. Free, fast, and private — all in your browser.
About Speed Converter
Quickly convert between the five most common speed units: meters per second (m/s), kilometers per hour (km/h), miles per hour (mph), knots (kn), and mach. All calculations use standard conversion factors and run entirely in your browser.
5 Speed Units
Covers m/s, km/h, mph, knots (nautical miles per hour), and mach (speed of sound at sea level). All the speed units you need.
Standard Factors
Uses internationally accepted conversion factors. Mach is calculated at sea level (340.29 m/s) for consistent reference.
Instant Results
Results update in real time as you type or change units. No submit button needed — just type and go.
100% Private
All conversions happen client-side with vanilla JavaScript. No data is sent anywhere. Works offline after load.
How It Works
- Enter a value — Type the speed you want to convert in the input field.
- Pick your units — Select the source unit in the first dropdown and the target unit in the second dropdown.
- Read the result — The converted speed appears instantly along with the conversion factor used.