Enter a speed, pick your units.
Type a speed value, choose the units, and get an exact result — with an advanced mode for full precision control and a complete unit table.
Applies to the main result and the full unit table below.
Three fields, one result.
No manual required — here's the entire flow.
Enter your value
Type the speed you want to convert into the value field. The tool starts you off with a value of 1.
Pick your units
Choose the unit you're converting from and the unit you want, or tap ⇅ to instantly swap the two.
Hit convert
Tap Convert and the exact result appears immediately in the results panel, right beside the tool.
Go further
Open Advanced options to adjust decimal precision or view your value converted into every supported unit at once.
Eight units, exact factors, full control.
Every conversion uses fixed, standard-defined factors — never rough estimates.
Metric units
The core metric speed units, based on the meter and second — the SI foundation for velocity.
Imperial & Nautical units
Includes the nautical mile per hour (knot) used in aviation and maritime navigation.
Advanced controls
Adjust decimal precision from 0–8 places, swap units in one tap, or view every conversion side by side.
Questions people actually ask.
The short answers — with the long ones one tap away.
How do I convert kilometers per hour to miles per hour?+
Multiply the number of km/h by 0.621371 to get mph. In this tool, just set Convert from to Kilometer per hour and Convert to to Mile per hour, or tap the 1 KM/H → MPH quick-conversion chip.
What is the exact conversion factor between km/h and m/s?+
One kilometer per hour equals exactly 1/3.6 meters per second (approximately 0.277778 m/s). This tool uses that exact ratio, along with equally precise standard factors for all supported units, so results are accurate rather than rounded estimates.
What is a knot, and how does it relate to mph?+
A knot is one nautical mile per hour, equal to exactly 1.852 km/h or approximately 1.15078 mph. It's commonly used in aviation and maritime navigation. This tool includes knots as a standard unit for quick conversion.
Can I see a value converted into every unit at once?+
Yes. Tap Show advanced under Advanced options and the results panel will display a full table converting your entered value into every supported unit at the same time.
Can I change how many decimal places are shown?+
Yes. Open Advanced options and choose a decimal precision from 0 to 8 places. It applies to both the main result and the full conversion table.
Is this speed converter free, and does it work offline once loaded?+
It's completely free with no account or sign-up. All the math runs directly in your browser using fixed conversion factors — no data is sent anywhere, and no external service is called to perform a conversion.