Decision tools built for clarity
Speed Converter
Convert speed values across metric, imperial, and nautical units.
Enter the required values, select the applicable options, and calculate.
Methodology
Formula or transformation
Normalizes speed through meters per second and applies the target-unit factor.
Variables
- Submitted speed
- Source unit conversion factor
- Canonical speed in meters per second
- Target unit conversion factor
Units
- Meter per second
- Kilometer per hour
- Mile per hour
- Foot per second
- Knot
Rounding policy
The converted speed is rounded half away from zero to twelve decimal places, and to twelve significant digits when it is below one.
Every supported unit is normalized through meters per second before conversion to the target unit.
Convert speed values across metric, imperial, and nautical units.
Reviewed sources
- NIST — SI conversion factors: area, volume, and speed Reviewed on 2026-09-07
Formula review history
-
Initial formula and source review.
Reviewed 2026-09-07 for formula version nist-speed-conversion-v1
Assumptions
- Inputs are interpreted using the displayed units and options.
- The calculation follows the methodology and factors listed in the sources.
Limitations
- Display rounding can hide additional decimal places.
- The calculation cannot add accuracy that is absent from the submitted inputs.
Worked example
Sixty miles per hour converts to 96.56064 kilometers per hour.
Frequently asked questions
What is a knot here?
One nautical mile (1,852 metres) per hour, so 1 knot is 1.852 kilometres per hour and 60 miles per hour is 96.56064 kilometres per hour.
Why convert through metres per second?
Every unit has an exact factor to metres per second, so any pair of units converts through one canonical value and the results agree in both directions.