What this calculator does
Convert speed between metric, imperial, nautical, and Mach units.
How it works
The calculator evaluates m/s = value × meters-per-second factor; result = m/s ÷ target factor. Inputs are checked before calculation, and invalid values such as zero denominators or out-of-range selections produce a clear error instead of a misleading result.
Input query strings and outputs
Use an input name in this page’s URL as ?name=value, and join additional inputs with &. Portable shared links may instead use the compact ?ac= state parameter.
Input query strings
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?value=SpeedNumber · Required · Default: 60
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?fromUnit=From unitChoice · Required · Default: mph · Accepted values: mps, kph, mph, fps, knot, mach
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?toUnit=To unitChoice · Required · Default: kph · Accepted values: mps, kph, mph, fps, knot, mach
Outputs
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resultConverted speedNumber · Primary output
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metersPerSecondMeters per secondNumber
Inputs and results
The inputs are Speed, From unit, To unit. Results include Converted speed, Meters per second.