Speed Converter

unit-converter

Convert between m/s, km/s, km/h, mph, knots, fpm, fps, ips, cm/s, mm/s, Mach (ISA), Beaufort wind force, and speed of light c. Metric, imperial, and specialized scales. All Unit Conversions panel included.

Convert Speed

Formula will appear here

All Unit Conversions

Meters per Second0.000000
Kilometers per Second0.000000
Kilometers per Hour0.000000
Miles per Hour0.000000
Knots0.000000
Feet per Minute0.000000
Feet per Second0.000000
Inches per Second0.000000
Centimeters per Second0.000000
Millimeters per Second0.000000
Mach (ISA sea level)0.000000
Beaufort wind force0.000000
Speed of light (c)0.000000

Dedicated converters (SI, imperial, navigation, aviation, wind scale, and relativistic units)

156 pages — every pair of units below, with fixed input/output, formulas, examples, and conversion tables.

Speed Converter Guide

Quick start

  • Enter a value and pick source and target units. The result updates as you type.
  • Use swap to reverse units and copy to copy the result. The All Unit Conversions panel lists your value across every supported speed unit.

Formulas & deeper content

Need formulas, worked examples, and tables for one pair (e.g. km/h to mph)? Use a dedicated converter from the list above.

Short answers to common questions are in the FAQ section above. All calculations run in your browser; m/s, km/h, mph, knots, ft/s, Mach (ISA), Beaufort, and c are supported.

Example uses

  • Transportation: km/h and mph limits and cruise speeds.
  • Aviation and marine: knots and Mach.
  • Weather: Beaufort force vs m/s or knots.
  • Science teaching: fractions of c vs m/s.
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