Measure & Convert
Speed Converter
Convert speed between miles per hour, kilometers per hour, meters per second, knots, and feet per second.
- Free to use
- Runs in your browser
- Level A · Standard formula
- Last reviewed 2026-08-16
How to use this calculator
Enter the requested values and select Calculate. The result is computed locally in your browser using the formula shown on this page.
Understanding the result
Convert common road, metric, marine, and engineering speed units.
Calculation method
Convert source speed to meters per second, then to the destination unit..
Calculator guide
About the Speed Converter
Convert common road, metric, marine, and engineering speed units.
What to keep in mind
- A knot is one nautical mile per hour.
- Conversion factors are fixed constants.
- Results may be rounded for display.
Formula & methodology
Convert source speed to meters per second, then to the destination unit.
Review standard: Level A · Standard formula. How calculator reviews work.CalculateMeasure performs the arithmetic locally in your browser. The displayed result depends on the values and units you enter.
Authoritative reference
NIST lists velocity conversion factors for mph, km/h, knots, feet per second, and meters per second.
NIST Guide to the SI — Velocity Conversion Factors ↗
Source links support the formula or conversion methodology. CalculateMeasure remains responsible for its implementation and testing.
Frequently asked questions
What does this calculator calculate?
Convert common road, metric, marine, and engineering speed units.
Can I use the result for an important decision?
Use the result as a calculation aid and verify the inputs, assumptions, and applicable professional or regulatory requirements before relying on it for an important decision.
Does CalculateMeasure store the values I enter?
This calculator performs its arithmetic in your browser. The calculator itself does not need to send your entered values to a server to produce the result.