Speed Converter Online Free
Convert speed units instantly. Switch between miles per hour, kilometers per hour, meters per second, feet per second, knots, Mach and more.
Convert Speed
1 km/h = 0.621371 mph
1 m/s = 3.6 km/h
1 knot = 1.852 km/h
Result
Popular Conversions
How to Use the Speed Converter
Convert speed units in three simple steps.
1. Enter speed
Type the speed value you want to convert.
2. Choose units
Select the original speed unit and the target unit.
3. View result
See the converted value and common speed equivalents instantly.
Fast speed conversion for travel, sports and science.
This Speed Converter helps drivers, runners, cyclists, students, sailors, pilots and engineers convert speed units quickly with accurate browser-based calculations.
You can convert miles per hour, kilometers per hour, meters per second, feet per second, knots, Mach and smaller speed units directly in your browser.
What is a speed converter?
A speed converter changes a speed value from one unit to another, such as miles per hour to kilometers per hour or meters per second to km/h.
It is useful for travel, driving, running, cycling, sailing, aviation, engineering, school and science calculations.
When should you use it?
- Converting mph to km/h
- Changing km/h to mph
- Working with meters per second
- Checking knots for marine or aviation use
- Comparing Mach, ft/s and other speed units
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Speed Converter FAQ
Common questions about converting speed units.
How do I convert mph to km/h?
Multiply miles per hour by 1.609344. For example, 60 mph equals about 96.5606 km/h.
How do I convert km/h to mph?
Multiply kilometers per hour by 0.621371. For example, 100 km/h equals about 62.1371 mph.
What is one knot in km/h?
One knot equals exactly 1.852 kilometers per hour.
Does this converter use a backend?
No. All speed conversions run directly in your browser with HTML, CSS and JavaScript.
How many m/s are in 1 km/h?
One kilometer per hour equals approximately 0.277778 meters per second.
Can I convert Mach to meters per second?
Yes. Select Mach as the original unit and meters per second as the target unit to convert instantly.
Can I copy the speed conversion result?
Yes. Click Copy Result to copy the current speed conversion.
Does it work on mobile?
Yes. This speed converter works on desktop, tablet and mobile browsers.