Speed Converter
Type a Value and choose From among m/s, km/h, or mph. The result lists every unit on its own line using the factors m/s = 1, km/h = 3.6, and mph = 2.23694 relative to meters per second. Invalid numbers show Enter a number.
Updated 2026-08-03 · units
m/s: 1
km/h: 3.6
mph: 2.23694
About this tool
This converter normalizes your input to m/s, then multiplies by each factor to print three lines such as m/s, km/h, and mph. The From select changes only the source unit; all three outputs stay visible so you can compare without flipping fields.
How to use
- Open the converter: Load this page so the Value field, From select, and result block appear.
- Enter the speed: Type a numeric Value (sample default is 1).
- Choose the source unit: Set From to m/s, km/h, or mph to match what you typed.
- Read all units: Check the result lines for m/s, km/h, and mph, or fix the Value if you see Enter a number.
Common use cases
- Convert a running pace or vehicle reading between metric and imperial speed units.
- Check science homework that mixes m/s with km/h.
- Translate a mph limit into km/h before a trip abroad.
Tips
- Pick the correct From unit before trusting the three output lines.
- Non-numeric Value text triggers Enter a number instead of NaN rows.
FAQ
Which units are supported?
Only m/s, km/h, and mph. Each appears as its own result line.
How is mph calculated?
Input is converted to m/s, then multiplied by 2.23694 for mph.
Why do I see Enter a number?
The Value field is not a finite number, so conversion is skipped.
Is my speed sent to a server?
Unit math runs in your browser as you type; no account is required.