How to Convert Speed: km/h, mph, m/s and Knots

To convert speed, enter a value and choose units in the Speed Converter, which handles meters per second, kilometers per hour, miles per hour and knots.

Follow along with the free Speed Converter, which runs in your browser, or browse more tools in this category.

How to use the Speed Converter

1. Enter the speed.
2. Choose the starting unit.
3. Choose the target unit.
4. Read the result.

Worked example

100 km/h is about 62.14 mph and 27.78 m/s. One knot is 1.852 km/h.

Tips and common mistakes

• Multiply m/s by 3.6 to get km/h.
• A knot is one nautical mile per hour, used in sea and air travel.
• Speed limits are shown in mph or km/h depending on the country.

Frequently asked questions