KM/H to mph●
Kilometres per hour in. Miles per hour out. Read road speeds abroad.
Speed
Use a decimal point, for example 2.54. Scientific notation works too: 1e3.
Try a value
Pick an example to startThe formula
miles per hour = kilometres per hour ÷ 1.609344
Divide the number of kilometres per hour by 1.609344 to get miles per hour. To go the other way, multiply by the same number.
A worked example
For 100 km/h, divide 100 by 1.609344. The result is approximately 62.137119 mph.
100 ÷ 1.609344 ≈ 62.137119 mph
Quick reference
Reference values are rounded to 6 decimal places. Use the converter above for other values or precision.
| Kilometres per hour (km/h) | Miles per hour (mph) |
|---|---|
| 10 | 6.213712 |
| 30 | 18.641136 |
| 50 | 31.06856 |
| 80 | 49.709695 |
| 90 | 55.923407 |
| 100 | 62.137119 |
| 110 | 68.350831 |
| 120 | 74.564543 |
| 130 | 80.778255 |
All equivalent units
The same value, in every supported unit.
Speed conversions
For driving abroad.
Use this conversion for speed limits and car speedometers when travelling between countries that use kilometres and miles. A quick check is to take 60 percent of the km/h value: 100 km/h is about 62 mph.
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 100 km/h in mph?
100 km/h is approximately 62.137119 mph.
How many miles per hour are in 90 kilometres per hour?
90 km/h is approximately 55.923407 mph. The converter can show more significant digits or round to a chosen number of decimal places.