Speed Converter
Convert between mph, km/h, m/s, knots, and more speed units. Free, instant, and accurate conversions.
Loading tool...
How to Convert Speed Units
Enter Value
Type the speed you want to convert.
Select Units
Choose your source and target speed units.
View Result
See the converted value instantly as you type.
Why Use Our Speed Converter?
All Speed Units
Convert between m/s, km/h, mph, knots, and ft/s.
Instant Results
Conversions happen in real time as you type.
Completely Free
No limits, no signup.
Private & Secure
All calculations happen in your browser.
Frequently Asked Questions
How fast is 100 km/h in mph?
100 km/h equals approximately 62.14 mph. Use the converter for precise values.
What is a knot?
A knot is one nautical mile per hour, equal to approximately 1.151 mph or 1.852 km/h. Used in maritime and aviation.
Is my data sent anywhere?
No. All calculations happen locally in your browser.
What is the speed of light in these units?
The speed of light is approximately 299,792,458 m/s, 1,079,252,848.8 km/h, or 670,616,629 mph.
How do I convert between km/h and m/s?
Divide km/h by 3.6 to get m/s. Multiply m/s by 3.6 to get km/h. The converter does this automatically.