Speed Converter

Convert common road, scientific, and marine speed units with a live comparison table.

From

Convert value

Decimal places

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Core conversion workflows

Start with a broad dimension converter or jump to the most common metric/imperial pairs. Specialist converters remain available from the full hub.

All 134 converters

Unit ConverterAll-in-one measurement conversion Length ConverterMetric and imperial length units Weight ConverterMass and weight units Temperature ConverterCelsius, Fahrenheit and Kelvin Inches → CMExact 2.54 conversion CM → InchesReverse exact length conversion KG → LBSKilograms to pounds LBS → KGPounds to kilograms °F → °CFahrenheit to Celsius °C → °FCelsius to Fahrenheit Miles → KMMiles to kilometers KM → MilesKilometers to miles

How to use this Speed Converter

Enter a value, choose the source and target units, and read the live converted result. The comparison table shows the same quantity in every supported unit on this page.

Units and conventions

Knots use nautical miles per hour; mph uses the international mile.