mph to km/h Converter (mph to km/h)
Miles per hour convert to kilometres per hour by multiplying by 1.609344. A 70 mph motorway limit equals about 113 km/h.
Convert units
Instant calculation in your browser. No sign-up or upload.
1 mph = 1.609344 km/h
Calculation working
- Result = input × source factor ÷ target factor
- 1 × 0.44704 ÷ 0.277777777777778 = 1.609344 km/h
- Factors refer to the same base quantity. Rounding is applied to the display, not intermediate calculations.
Display: 10 significant digits. More digits do not make the original measurement more accurate.
Try a practical example
Batch conversion
One value per line, up to 200. Uses the selected mph → km/h units. Invalid rows stay visible in the results and CSV.
Compare all units
Using this speed converter
Compare road speeds, measured velocities and marine or aviation speeds using the same distance-per-time basis.
The conversion changes speed units only. Travel time still depends on the actual route, stops and speed profile.
Check before using the result
- A knot is one nautical mile per hour, not one international mile per hour.
- Do not confuse m/s with m/min. Acceleration is a different quantity and uses units such as m/s².
Definitions and method: NIST: unit conversion factors and rounding. Calculations use double-precision arithmetic; the display precision can be adjusted above.
mph to km/h conversion chart
| Mile/hour (mph) | Kilometer/hour (km/h) |
|---|---|
| 5 | 8.04672 |
| 10 | 16.09344 |
| 20 | 32.18688 |
| 25 | 40.2336 |
| 30 | 48.28032 |
| 40 | 64.37376 |
| 50 | 80.4672 |
| 60 | 96.56064 |
| 70 | 112.65408 |
| 80 | 128.74752 |
| 100 | 160.9344 |
| 120 | 193.12128 |
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