What is the Speed Converter?
Speed limits in Pakistan are in km/h, UK and US roads use mph, physics problems use metres per second, and ships and aircraft use knots. The speed converter shows every unit at once.
Choose a unit and type a value. For distances use KM to Miles Converter; for every other measurement use the Unit Converter.
How to use the Speed Converter
- Choose the unit you have, such as km/h.
- Type the speed.
- Read the speed in mph, m/s, knots and ft/s.
Formula
mph = km/h × 0.621371 · m/s = km/h ÷ 3.6 · knots = km/h ÷ 1.852
Example
The motorway limit of 120 km/h is 74.6 mph or 33.3 m/s. A wind of 20 knots is 37 km/h.
Common speeds
| km/h | mph | m/s |
|---|---|---|
| 30 | 18.6 | 8.3 |
| 60 | 37.3 | 16.7 |
| 100 | 62.1 | 27.8 |
| 120 | 74.6 | 33.3 |
| 160 | 99.4 | 44.4 |
Speed limits and everyday speeds
To work out the fuel cost of a road trip, use the Petrol Cost Calculator; to convert distances use KM to Miles Converter.
| Situation | km/h | mph |
|---|---|---|
| Walking | 5 | 3.1 |
| Cycling | 15–25 | 9–16 |
| City roads in Pakistan | 40–70 | 25–43 |
| Motorway limit (M-2) | 120 | 75 |
| UK motorway limit | 113 | 70 |
| Commercial flight | ~900 | ~560 |
Knots and Mach
Ships and aircraft use knots: 1 knot is one nautical mile per hour, or 1.852 km/h. Mach 1 is the speed of sound, about 1,235 km/h at sea level, and depends on air temperature.
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Frequently asked questions
How do I convert km/h to mph?
Multiply by 0.621371. 100 km/h is 62.1 mph.
How do I convert m/s to km/h?
Multiply by 3.6. 10 m/s is 36 km/h.
What is a knot?
One nautical mile per hour, 1.852 km/h.
How fast is 1 mph in km/h?
1.609 km/h.
What is the speed limit on Pakistani motorways?
Generally 120 km/h for cars (about 75 mph); check the signs for each section.
Is the Speed Converter free to use?
Yes. The Speed Converter on Custom Converter is completely free, with no sign-up, no daily limit and no watermark.
Does the Speed Converter work on mobile phones?
Yes. It is built mobile-first and works on Android phones, iPhones, tablets and computers in any modern browser, with no app to install.