Speed Converter
Convert between miles per hour, kilometers per hour, meters per second, feet per second, and knots. Type a value and the result updates instantly.
About Speed Converter
This speed converter handles the units used for driving, running, flying, and sailing, including miles per hour, kilometers per hour, meters per second, feet per second, and knots.
All conversions use exact factors relative to meters per second, so results are accurate whether you are checking a speed limit abroad or a pace in the lab.
How to Use
- Enter the speed you want to convert.
- Choose the unit you are converting from.
- Choose the unit you are converting to.
- Read the result, or swap the direction with one click.
Frequently Asked Questions
How fast is 100 km/h in mph?
About 62.1 miles per hour. Enter 100, choose kilometers per hour, and select miles per hour to see the precise value.
What is a knot?
A knot is one nautical mile per hour, used in aviation and at sea. One knot is about 1.15 miles per hour.
Is the tool private?
Yes. All math runs in your browser and nothing is uploaded.
About Matt George
I'm Matt George, a software engineer in the startup space. I run my own shop building software for early-stage founders, and I love making free tools and experiences that people actually use. Enjoy using Speed Converter!