Precision and rounding
Road displays can usually be rounded sensibly, but navigation, engineering, athletics, and scientific calculations may require additional significant digits.
Conversion library
Speed converters
Convert road, marine, scientific, and astronomical speeds across kilometers per hour, miles per hour, knots, and more.
7 units42 directional pairsExact formulas
Common starting points
Popular speed conversions
Mile per hour to Kilometer per hourKilometer per hour to Mile per hourKnot to Kilometer per hourMeter per second to Kilometer per hourFoot per second to Meter per secondSpeed of light to Kilometer per hour
Browse popular conversions across all categories →Essential context
Understanding speed conversions
Speed combines distance with time. Conversions must account for both parts of the unit, such as changing miles to kilometers while keeping the one-hour interval consistent.
A distinction that matters
A knot is exactly one nautical mile per hour. It is a speed unit, not a distance unit, and is standard in marine and aviation contexts.
Complete directory
Browse by starting unit
Choose the unit you have, then select the unit you need. Every destination opens a dedicated static page with an interactive converter, formula, worked example, and reference table.
From Centimeter per second
cm/sFrom Meter per second
m/sFrom Kilometer per hour
km/hFrom Foot per second
ft/sFrom Mile per hour
mphFrom Knot
knFrom Speed of light
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