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Speed Converter
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Speed Converter
Convert among km/h, mph, m/s, and knots with comparison tables.
About this converter
Speed units vary by region and industry. This converter brings road, scientific, and nautical units into one place for quick calculations and comparisons.
The base unit for this converter is meter-per-second, which lets us map each unit into one consistent formula layer before converting to the target unit.
Quick examples
Available units
Meter per second
m/sThe SI-derived unit for speed.
Also written as mps, meters per second, metres per second.
Kilometer per hour
km/hA metric unit common for road speed.
Also written as kph, kmh, kilometers per hour, kilometres per hour.
Mile per hour
mphA customary unit for road speed.
Also written as miles per hour.
Knot (international)
knA nautical speed unit.
Also written as kt, kts, knots.
Kilometer per second
km/sA metric speed unit used in orbital and ballistic contexts.
Kilometer per minute
km/minA metric speed unit expressing distance per minute.
Meter per minute
m/minA slow metric speed unit used in machinery and conveyor systems.
Meter per hour
m/hA very slow metric speed unit used for low-rate motion.
Centimeter per minute
cm/minA small-scale metric speed unit per minute.
Millimeter per minute
mm/minA precision-level metric speed unit per minute.
Foot per second
ft/sAn imperial speed unit used in engineering and ballistics.
Foot per minute
ft/minAn imperial speed unit used in HVAC and machinery.
Inch per minute
in/minAn imperial speed unit used in machining.
Knot (UK Admiralty)
kn UKA historical knot based on the UK Admiralty nautical mile of 6,080 feet.
Mach (standard atmosphere)
MaSpeed expressed as a multiple of the speed of sound in dry air at 15 °C and sea level (about 340.27 m/s).