MPH to km/h●
Miles per hour in. Kilometres per hour out. Read US and UK speed limits.
Speed
Use a decimal point, for example 2.54. Scientific notation works too: 1e3.
Try a value
Pick an example to startThe formula
kilometres per hour = miles per hour × 1.609344
Multiply the number of miles per hour by 1.609344 to get kilometres per hour. To go the other way, divide by the same number.
A worked example
For 60 mph, multiply 60 by 1.609344. The result is approximately 96.56064 km/h.
60 × 1.609344 ≈ 96.56064 km/h
Quick reference
Reference values are rounded to 6 decimal places. Use the converter above for other values or precision.
| Miles per hour (mph) | Kilometres per hour (km/h) |
|---|---|
| 5 | 8.04672 |
| 10 | 16.09344 |
| 20 | 32.18688 |
| 30 | 48.28032 |
| 40 | 64.37376 |
| 50 | 80.4672 |
| 60 | 96.56064 |
| 70 | 112.65408 |
| 80 | 128.74752 |
All equivalent units
The same value, in every supported unit.
Speed conversions
For driving in the US and UK.
Use this conversion for US and UK speed limits. Multiply mph by 1.609344. A quick check is to add 60 percent: 50 mph is about 80 km/h.
Calculation details & precision
Speed conversions use metres per second as the base unit. One km/h is 1/3.6 m/s. One mph is exactly 0.44704 m/s. One knot is one international nautical mile per hour: 1,852 metres in 3,600 seconds.
Automatic displays up to 12 significant digits. Choose 2, 4 or 6 decimal places in Precision for a shorter result. Displayed results are rounded; very large or small values use scientific notation.
Common questions
What is 70 mph in km/h?
70 mph is approximately 112.654 km/h.
How many kilometres per hour are in 55 miles per hour?
55 mph is approximately 88.51392 km/h. The converter can show more significant digits or round to a chosen number of decimal places.