Speed Converter
Convert speed between meters per second, kilometers per hour, miles per hour, feet per second, and knots. Calculates in your browser.
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About speed conversions
Enter a value and choose the units to convert between. Each speed unit is defined against a single base unit, so any pair lines up consistently, the table shows your value in every speed unit at once.
What this does
A speed converter changes a rate of travel from one unit to another, meters per second, kilometers per hour, miles per hour, feet per second, and knots.
How to use it
- Enter a value and pick its unit.
- Choose the unit to convert to.
- Read the converted result instantly.
- Swap the units to reverse the conversion.
How it works
Each value is converted to meters per second first and then to the target unit. A knot is one nautical mile per hour, which is exactly 1.852 km/h.
mph = km/h × 0.621371
Example
100 km/h is about 62.14 mph, and 1 m/s is 3.6 km/h. A 10-knot wind is about 18.52 km/h.
Sources & methodology
Last updated .
Frequently asked questions
How do I convert km/h to mph?
Multiply km/h by about 0.6214. So 100 km/h is roughly 62.14 mph.
What is a knot?
One knot is one nautical mile per hour, 1.852 km/h, used for boats and aircraft.
Is my data stored?
No. Everything is calculated locally in your browser.
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