Speed Converter
Convert speed between meters per second, kilometers per hour, miles per hour, knots, feet per second, and 7 other units. Enter one value and pick its unit, then either see the equivalent in every unit at once or pick a single target unit.
Input
Output
| Unit | Value |
|---|---|
| No data yet | |
Guides
The Speed Converter turns a single velocity measurement into its equivalent across 12 units at once. Enter one value, choose the unit it is expressed in, and the tool instantly builds a table showing the same speed in meters per second, kilometers per hour, miles per hour, knots, and more.
Speed units vary by context: road signs use km/h or mph depending on the country, aviation and marine navigation use knots, and physics problems favor meters per second (the SI unit). This tool converts between all of them at once.
How to use it
- Type the amount you want to convert into the Amount box.
- Pick the unit that amount is in from the Unit list.
- Optionally set the Decimal precision (0 to 10 places) for how the results are rounded.
The results table updates automatically. Use the copy and download buttons to grab every conversion as CSV.
How do I convert km/h to mph?
Multiply kilometers per hour by about 0.6214 to get miles per hour — so 100 km/h is roughly 62.14 mph. This tool applies that factor (and its inverse) automatically.
What is a knot?
A knot is one nautical mile per hour, equal to about 1.852 km/h or 1.151 mph. It's the standard speed unit in maritime and aviation navigation because it ties directly to the nautical mile, which is based on the Earth's circumference.
How many meters per second is highway speed?
A typical highway speed of 100 km/h is about 27.78 m/s. Meters per second is the SI base unit for speed and is what physics calculations use directly.
Why does the tool include kilometers per minute and miles per minute?
Some fields — such as ballistics, pace calculations, and certain engineering specs — express speed per minute rather than per hour or second. Having all common time bases in one table avoids an extra manual conversion step.
Privacy
Every conversion runs entirely in your browser. Nothing you enter is sent to a server, logged, or stored.
Use it from code
From 3 credits per callREST API
curl -X POST https://api.iotools.cloud/v1/tool/speed-converter \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"value": "1",
"fromUnit": "kilometer_per_hour",
"toUnit": "all",
"precision": "4"
}'Swap in your own key from your account. The tool's fields are the body — no wrapper.
Ask an AI agent
Use the IOTools `speed-converter` tool (Speed Converter) on this input:
YOUR_INPUT_HEREPaste this at any agent connected to the IOTools MCP server, then add your input.