Mph to Km/h Converter
Enter a value in miles per hour to convert it to kilometers per hour — 1 mph = 1.6093 km/h.
Reviewed by the ToolNestr Editorial Team — July 2026
How to convert miles per hour to kilometers per hour
Converting miles per hour to kilometers per hour is a simple multiplication: take your speed in miles per hour and multiply by the fixed conversion factor of 1.609344 to get kilometers per hour. Because the factor never changes, the same calculation works for any value, from tiny amounts to very large ones. The converter above applies it the moment you type, with no rounding errors in the underlying maths.
Translate a US or UK speed limit into the km/h shown on most car dashboards worldwide. Knowing how to move between miles per hour and kilometers per hour is useful whenever measurements are given in one system but you need them in the other — for shopping, travel, study, cooking, engineering or simply comparing figures from different countries.
The reference table below lists common miles per hour values already converted to kilometers per hour, so you can read off everyday amounts at a glance without typing. For the opposite direction, use the Km/h to Mph Converter, which reverses the calculation exactly.
The formula and a worked example
Formula
km/h = mph × 1.609344
Worked example
To convert 10 miles per hour: 10 × 1.609344 = 16.0934 km/h. To convert 25 miles per hour: 25 × 1.609344 = 40.2336 km/h.
Mph to Km/h conversion table
| Miles per Hour (mph) | Kilometers per Hour (km/h) |
|---|---|
| 1 | 1.6093 |
| 2 | 3.2187 |
| 5 | 8.0467 |
| 10 | 16.0934 |
| 25 | 40.2336 |
| 50 | 80.4672 |
| 100 | 160.9344 |
| 250 | 402.336 |
| 500 | 804.672 |
| 1,000 | 1,609.344 |
Values are rounded for display; the converter above keeps full precision.
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Frequently asked questions
How do I convert miles per hour to kilometers per hour?
Multiply the number of miles per hour by 1.609344. For example, 10 mph × 1.609344 = 16.0934 km/h. The converter above does this automatically.
How many kilometers per hour are in one miles per hour?
There are 1.6093 kilometers per hour in one miles per hour. Multiply by 1.609344 for any amount.
Is this Mph to Km/h converter accurate?
Yes. It uses the exact conversion factor of 1.609344, so results are precise. Values shown in the table are rounded for readability.
How do I convert kilometers per hour back to miles per hour?
Use our Km/h to Mph Converter for the reverse direction, or divide the kilometers per hour value by 1.609344.