Convert speed between km/h, mph, m/s and knots for driving, sport and weather. Enter a value and pick the units.
It runs in your browser, instantly and free.
How to use the Speed Converter
- Enter a speed value.
- Choose the from and to units.
- See the converted result.
km/h, mph, knots and metres per second
One mph is 1.609 km/h, so a 70 mph motorway limit is about 113 km/h and a 100 km/h limit is 62 mph. Knots, used at sea and in aviation, are nautical miles per hour: one knot is 1.852 km/h. Metres per second, the science standard, converts as 1 m/s equals 3.6 km/h, which makes wind speeds in forecasts easy to translate.
Reading speeds in context
Anchors help: walking is about 5 km/h or 3 mph, a sprinting human peaks near 37 km/h, city traffic runs 50 km/h or 31 mph, a cruising airliner does roughly 900 km/h or 490 knots, and a 20 knot wind is a strong 37 km/h breeze.
Common uses
- Driving abroad with different speed limit units
- Converting wind speeds between forecasts
- Marine and aviation planning in knots
- Sports and physics calculations in m/s
Embed this tool on your website
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Frequently asked questions
Is it free?
Yes, free with no signup.
Which units are supported?
km/h, mph, m/s and knots.
Can I convert km/h to mph?
Yes, and many other combinations.
Is my input stored?
No. It is converted in your browser.