Unit converter
Miles Per Hour to Kilometers Per Hour Converter
A speed of one mile per hour equals exactly 1.609344 kilometres per hour, the same fixed ratio that links a mile to 1.609344 kilometres. Type a speed in mph and this tool returns it in km/h, with a table for the limits and readings people check most. Drivers crossing from the UK or US into mainland Europe use it to read a 70 mph motorway habit against a 110 km/h sign, and to translate a car speedometer’s outer scale or a sat-nav reading between the two systems.
1 mile per hour = 1.6093 kilometers per hour
Common miles per hour to kilometers per hour values
| Miles per hour | Kilometers per hour |
|---|---|
| 1 mph | 1.6093 km/h |
| 2 mph | 3.2187 km/h |
| 5 mph | 8.0467 km/h |
| 10 mph | 16.0934 km/h |
| 20 mph | 32.1869 km/h |
| 50 mph | 80.4672 km/h |
| 100 mph | 160.93 km/h |
How to convert
- Take the speed in miles per hour.
- Multiply by 1.609344 to convert it to kilometres per hour.
- The result is the identical speed shown in km/h.
- To reverse it, divide a km/h value by 1.609344 to recover mph.
- For a fast estimate on the road, multiply mph by 1.6: 50 mph is about 80 km/h.
km/h = mph × 1.609344
One mile equals exactly 1.609344 kilometres, and the per-hour part is unchanged, so a speed in mph multiplied by 1.609344 gives the same speed in km/h. Dividing by 1.609344 turns km/h back into mph.
- mph
- the speed in miles per hour you start with
- 1.609344
- kilometres per hour in one mile per hour
Worked example
A 70 mph motorway limit becomes 70 times 1.609344, which is about 112.65 km/h. A 30 mph town limit converts to roughly 48.28 km/h.
Key facts
- One mph is exactly 1.609344 km/h.
- A 70 mph limit is about 112.65 km/h; a 30 mph limit is about 48.28 km/h.
- 100 mph works out at roughly 160.93 km/h.
- A common European 130 km/h motorway limit is close to 81 mph.
Tips
- For roadside maths, the factor 1.6 is close enough to judge a limit at a glance.
- Many speedometers carry both scales, so check the inner ring before converting by hand.
Frequently asked questions
How many km/h is 1 mph?+
Exactly 1.609344 km/h, because one mile is defined as 1.609344 kilometres.
What is 60 mph in km/h?+
Around 96.56 km/h, found by multiplying 60 by 1.609344.
Why is the UK in mph but Europe in km/h?+
Britain kept imperial road signs while most of continental Europe adopted metric speeds, so drivers cross between the two scales at the border.
Is the conversion exact?+
Yes. The mile and kilometre have a fixed relationship since 1959, so 1 mph is exactly 1.609344 km/h with no rounding.
Things to watch
- Multiplying by 1.6 instead of 1.609344 understates higher speeds by a few km/h, which can matter near a limit.
Sources
Last updated: 2026-01-01
Conversions use internationally defined factors. Provided for general use; verify critical measurements independently.