Speed & Distance Converter
Convert mph, km/h, m/s and knots, plus miles, kilometres, metres and feet.
Free, no sign-upIncludes a step-by-step guideBy AAutomotives Editorial Team
Speed and distance converter
Speed
Distance
Speed results
mph–
km/h–
m/s–
knots–
Distance results
miles–
kilometres–
metres–
feet–
Car speedometers, road signs and spec sheets use different units depending on the country. Use this converter to switch between mph and km/h, and between miles, kilometres, metres and feet, without doing the maths in your head.
Conversion factors used
- 1 mile = 1.609344 kilometres
- 1 mph = 1.609344 km/h
- 1 knot = 1.852 km/h
- 1 m/s = 3.6 km/h
- 1 foot = 0.3048 metres
Worked example
A road sign shows 70 mph. 70 × 1.609344 = 112.7 km/h. Going the other way, 100 km/h ÷ 1.609344 = 62.1 mph. For distance, a 250 km trip is 250 ÷ 1.609344 = 155.3 miles.
Quick reference
| mph | km/h |
|---|---|
| 20 | 32 |
| 30 | 48 |
| 40 | 64 |
| 50 | 80 |
| 60 | 97 |
| 70 | 113 |
| 80 | 129 |
A handy mental shortcut is that 100 km/h is a little over 62 mph, and 60 mph is about 97 km/h.
Common mistakes
- Dividing by 1.6 and rounding too early on long distances. Use 1.609344 for accuracy.
- Mixing up the direction. Multiply by 1.609344 to go from miles to kilometres and divide to go back.
- Assuming a digital speedometer shows the exact real speed. It can read slightly high, and tire size also changes it.
- Forgetting that knots are used for boats and aircraft, not road vehicles.
Frequently asked questions
How do I convert mph to km/h?
Multiply the mph figure by 1.609344. For example, 60 mph is about 96.6 km/h.
How do I convert km/h to mph?
Divide the km/h figure by 1.609344, or multiply by about 0.6214.
How many kilometres are in a mile?
One mile is 1.609344 kilometres.
Is my speedometer accurate?
Speedometers can read slightly high, and a change in tire size changes the reading. See our tire size calculator to check the effect.