Speed Converter
Convert between speed units — meters per second, kilometers per hour, miles per hour, knots, feet per second and more.
Reviewed by the ToolNestr Editorial Team — July 2026
About this speed converter
Speed measures how fast something moves, used in driving, sport, sailing and flight. This speed converter lets you move between 5 different speed units in either direction. Pick the unit you are starting from, the unit you want, and enter a value — the result appears instantly as you type, with the calculation running entirely in your browser.
Internally, every unit is defined by its exact ratio to a single base unit, the meter per second. To convert, the tool first changes your value into the base unit, then into the target unit. This base-unit method keeps results consistent and precise no matter which pair of units you choose, and makes it easy to add uncommon units alongside the everyday ones.
Use the swap control to reverse the direction at any time, which is handy when you are checking a figure both ways. Because the converter is mobile-first and works offline once loaded, it is a quick reference for speed whether you are studying, working, travelling or shopping across measurement systems.
Supported speed units
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Frequently asked questions
How does this speed converter work?
Choose the unit you have and the unit you want, type a value, and the tool converts it via a common base unit (the meter per second). It supports 5 speed units.
Is the speed converter accurate?
Yes. Every unit is defined by its exact ratio to the meter per second, so conversions are precise; displayed results are rounded for readability.
Can I convert in both directions?
Yes. Swap the “from” and “to” units, or press the swap button, to convert either way between any two speed units.
Which speed units are supported?
It includes Meters per second, Kilometers per hour, Miles per hour, Knots, Feet per second.