To convert km/h to mph, divide by 1.609344 (or multiply by about 0.621). 50 km/h is 31.07 mph, 100 km/h is 62.14 mph, and 130 km/h is 80.78 mph.
Canada, Europe, Australia and most other countries post limits in km/h. If you're driving a US car abroad, or reading a European car's top speed, this converts it.
How to use the km/h to mph converter
- Type the value in km/h into the box. Decimals are fine.
- The result in mph updates as you type, along with the working.
- Need the other way? Switch the direction menu, or open the mph to km/h converter.
Formula
Because a mile is exactly 1.609344 km, 1 mph is exactly 1.609344 km/h (and 0.44704 m/s). The hour is the same in both units, so only the distance changes.
Worked example
A sign in Canada says 100 km/h. How fast is that in mph?
- 100 ÷ 1.609344 = 62.14.
- Result: 62.1 mph.
Km/h to mph chart
Common values, rounded to 2 decimal places.
| Km/h (km/h) | Mph (mph) |
|---|---|
| 10 km/h | 6.21 mph |
| 20 km/h | 12.43 mph |
| 30 km/h | 18.64 mph |
| 40 km/h | 24.85 mph |
| 50 km/h | 31.07 mph |
| 60 km/h | 37.28 mph |
| 70 km/h | 43.5 mph |
| 80 km/h | 49.71 mph |
| 90 km/h | 55.92 mph |
| 100 km/h | 62.14 mph |
| 110 km/h | 68.35 mph |
| 120 km/h | 74.56 mph |
| 130 km/h | 80.78 mph |
| 140 km/h | 86.99 mph |
| 150 km/h | 93.21 mph |
| 200 km/h | 124.27 mph |
| 250 km/h | 155.34 mph |
| 300 km/h | 186.41 mph |
Common metric speed limits
- 30 km/h (18.6 mph): school zones and many European city centers.
- 50 km/h (31.1 mph): default urban limit across much of Europe.
- 100 km/h (62.1 mph): Canadian and Australian highways.
- 130 km/h (80.8 mph): French and Italian motorways in good weather.
Many speedometers show both scales, with km/h in the smaller inner ring on US cars.
Quick mental math
Halve it and add a quarter of the half: 120 km/h → 60 + 15 = 75 mph (exact: 74.56). Or multiply by 0.6 and add a little.
Related conversions
Going the other way: mph to km/h converter. Related pages: . For other units in the same family, use the full speed converter.
Caveats and assumptions
- Results show up to 10 significant digits; the chart is rounded for reading. Keep full precision for engineering, medical or legal work.
Frequently asked questions
What is 100 km/h in mph?
62.14 mph.
What is 120 km/h in mph?
74.56 mph.
How many mph is 1 km/h?
About 0.621 mph.
Is kph the same as km/h?
Yes. "kph" is an informal spelling; the standard symbol is km/h.
Sources
- NIST SP 811 Appendix B.9 — Conversion factors — mile per hour to kilometer per hour and meter per second
- NIST — SI Units: Length (1959 definition of the inch) — 1 in = 25.4 mm exactly
This calculator gives estimates for planning and education. Check measurements, local codes, supplier specs and your school's official policy before relying on a result. See our disclaimer and how we build and check calculators.