Speed Converter

Speed: convert between knots, mph, and km/h using exact nautical mile and statute mile definitions.

Works for any combination of the units above -- every value converts through the same verified base-unit math used on the individual pages.

How Speed Units Relate

Speed units combine a distance unit and a time unit. Knots (nautical miles per hour) are standard in maritime and aviation navigation, kilometers per hour is the metric standard used by most of the world's road signs, and miles per hour is standard in the United States and the United Kingdom.

All Speed Converters

Each of these has its own page with the exact formula, a reference table, and answers to common questions.

Knot to Mile per Hour Kilometer per Hour to Mile per Hour Mile per Hour to Kilometer per Hour

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