Convert speed instantly — type a value, pick your units, and every other common unit updates live below. 100% free, runs entirely in your browser, no sign-up.
Every unit below updates live from the value you enter in the "From" field above.
Speed is just distance over time, so every unit here is built from a length unit and a time unit — km/h is kilometers divided by 3.6 to get meters per second, since there are 3.6 thousand-seconds in an hour per kilometer. The knot (one nautical mile per hour) is still the standard for aviation and marine navigation worldwide.
Yes. It's completely free with no sign-up, and every conversion runs locally in your browser via JavaScript — the numbers you type are never sent to our servers.
Each unit uses its standard, internationally defined conversion factor, calculated in full precision and only rounded for display. Results are accurate to at least 6 significant figures.
This page intentionally covers the most commonly used speed units rather than an exhaustive engineering list. Use the suggestion button in the bottom-right corner of any page to request a unit and we'll consider adding it.
Tell us what to improve or which tool to add next.
