Speed Converter
Convert a speed between metres per second, kilometres per hour, miles per hour, knots and feet per second. Converts instantly in your browser.
Also searched as: mph to kmh · kmh to mph · knots to mph
Updated November 6, 2026
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How to use it
- 1
Enter a value
Type the speed you want to convert.
- 2
Pick the units
Choose what to convert from and to.
- 3
Read the result
The answer updates as you type.
Questions about speed converter
What is 100 km/h in mph?
About 62.1 mph.
Does it include knots?
Yes, knots are included for nautical and aviation use.
Is anything uploaded?
No, the conversion runs on your device.
Which speed unit to use
Kilometres per hour appear on road signs in most of the world, while miles per hour are used in the United States and the United Kingdom. Knots, one nautical mile per hour or exactly 1.852 km/h, are the standard at sea and in aviation. Metres per second are common in science and sports timing, and feet per second show up in some engineering and ballistics work.
The table shows what one of each unit is worth in the others.
| One of… | Metres per second | Kilometres per hour | Miles per hour | Knots |
|---|---|---|---|---|
| Metres per second | 1 | 3.6 | 2.237 | 1.944 |
| Kilometres per hour | 0.2778 | 1 | 0.6214 | 0.54 |
| Miles per hour | 0.447 | 1.609 | 1 | 0.869 |
| Knots | 0.5144 | 1.852 | 1.151 | 1 |
| Feet per second | 0.3048 | 1.097 | 0.6818 | 0.5925 |
Worked examples
A 100 km/h limit is about 62.14 mph, and a 70 mph limit is about 112.7 km/h. A ship making 30 knots travels at about 55.56 km/h, and a brisk walking pace of 5 km/h is about 3.107 mph.
For a quick estimate, multiply miles per hour by 1.6 to get kilometres per hour, or multiply kilometres per hour by 0.62 to get miles per hour.
Typical speeds for reference
It helps to have a feel for the numbers. These everyday speeds are approximate and are shown in the three units most often compared. Speed limits and cruising speeds vary by country and aircraft, so treat them as round examples.
| Example | km/h | mph | Knots |
|---|---|---|---|
| Brisk walking | 5 | 3.107 | 2.7 |
| Cycling at a steady pace | 20 | 12.43 | 10.8 |
| A common urban speed limit | 50 | 31.07 | 27 |
| A common motorway speed limit | 120 | 74.56 | 64.79 |
| An airliner at cruising speed (about) | 900 | 559.2 | 486 |
| Sound in air at 20 °C (343 m/s) | 1,235 | 767.3 | 666.7 |