About this calculator
1 km/h is 1,000 m per 3,600 s. One mile per hour is exactly 0.44704 m/s, and one knot is one nautical mile (1,852 m) per hour.
Worked example
100 km/h ÷ 1.609344 = 62.14 mph. The same speed is 27.78 m/s.
How to use the speed converter
- Enter the value.
- Choose the from.
- Choose the to.
- Read the result — it updates as you type.
Frequently asked questions
What is 100 km/h in mph?
100 km/h is about 62.14 mph.
What is a knot?
A knot is one nautical mile per hour, about 1.852 km/h. It is used at sea and in aviation.