How this calculator works
Speed is distance per fixed time. A knot is one nautical mile (1,852 m) per hour. Miles per hour here uses the international mile of 1,609.344 m.
The formula
Base amount = value × source factor
Target amount = base amount / target factorA quick example
100 km/h is approximately 62.137119 mph.
How to use this calculator
- Enter a value using a decimal point.
- Choose the source and target units.
- Read the live result or swap units to reverse the direction.
A few common questions
Which convention does this converter use?
Speed is distance per fixed time. A knot is one nautical mile (1,852 m) per hour. Miles per hour here uses the international mile of 1,609.344 m.
Can I reverse the conversion?
Yes. Swap exchanges the units, keeps your input amount and calculates again.
Why is the displayed result rounded?
The calculation uses the full stored factor. Results show up to six decimal places, with scientific notation for very small or large amounts.
Reference: NIST conversion factors