Speed Converter
Enter a value and choose your source and target units to convert instantly between miles per hour, kilometers per hour, meters per second, feet per second, and knots.
Converted value
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How the Speed Converter formula works
Every unit routes through meters per second as a common base:
value_in_mps = value × factor_of_source_unit result = value_in_mps / factor_of_target_unit
For example, 1 mph = 0.44704 m/s and 1 knot = 0.514444 m/s.
Step-by-step calculation
- Multiply the entered value by its unit's conversion factor to get meters per second.
- Divide that value by the target unit's conversion factor.
- Round to a sensible number of decimal places.
Worked example
Converting 60 mph to km/h: 60 × 0.44704 = 26.82 m/s. 26.82 / 0.277778 (km/h factor) ≈ 96.6 km/h.
Frequently asked questions
What's a knot, and why is it different from mph?
A knot is one nautical mile per hour, used in aviation and maritime navigation. A nautical mile (1,852 m) is longer than a statute mile (1,609.344 m), so 1 knot (about 1.15 mph) is slightly faster than 1 mph.