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Speed conversion

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Conversion between units index
Speed conversion diagram
calc
Conversion between different units of speed is provided by the use of appropriate factors. Choose the input and output units required by use of the menus.
Speed
per

is
per
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notes
The SI unit for speed is m/s, but science often uses other units for the sake of convenience. Magnetic tape speeds are often measured in in/s, and vehicle speed in mph or km/h. The speeds of spacecraft are often measured in km/s, mps, or as a Mach number (Mach 1=340.3 m/s) and of very slow event (such as glaciers) in units like m/year. Some reciprocal units (used e.g. in running) are also available in the units menu.