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Speed Converter
Convert between km/h, m/s, mph, and knots for driving, aviation, and marine use.
Favorite it to find it fast on home
When to use it
100 km/h → about 27.8 m/s
10 knots → about 18.5 km/h
A 3-hour marathon → about 14.1 km/h average
How to use it
1Step 1Fill in the values
2Step 2Change a value and the result updates instantly
3Step 3Save or copy the result
If the result looks off
The result looks wrong
Check the units and the baseline first. Changing a value updates the result instantly.
I want the starting values back
Press reset to return to the initial state.
Frequently asked questions
What is a knot?
A nautical and aviation unit equal to 1.852 km/h.
Where are knots used?
Shipping and aviation. One knot is 1.852 km/h, not the same as a land mile per hour.