Speed converter
Enter a speed in any unit and see the equivalent in m/s, km/h, mph, and knots simultaneously. Useful for travel, physics, and aviation calculations.
How it works
Each unit is stored as a multiplier relative to a base unit. When you enter a value, the tool converts it to the base unit first, then multiplies by each target unit's factor. Temperature is handled separately using its own formulas (°C → °F: multiply by 9/5 then add 32; °C → K: add 273.15). All conversion runs in your browser. Our servers are not involved.
Processing runs in your browser
All conversions happen instantly in your browser tab. Our servers are not involved at any point.
Related operations
For converting between bytes, kilobytes, and gigabytes, try the byte converter. To work with fractions alongside metric values, use the fraction calculator. For taking a percentage of a converted value, see the percentage calculator.
Frequently asked questions
- How do I convert km/h to mph?
- Divide the km/h value by 1.60934. For example, 100 km/h ÷ 1.60934 ≈ 62.14 mph. Or multiply by 0.62137.
- What is a knot?
- A knot is one nautical mile per hour, equal to 1.852 km/h or approximately 1.151 mph. It is commonly used in aviation and maritime navigation.
- How fast is the speed of sound?
- The speed of sound in dry air at 20°C is approximately 343 m/s, 1235 km/h, or 767 mph. It varies with temperature and altitude.