Convert miles per hour to kilometers per hour for road travel.
Convert miles per hour to kilometers per hour using the official US customary standard conversion factor of 1 mph = 1.609344 km/h.
Convert miles per hour to kilometers per hour for road travel.
Convert miles per hour to kilometers per hour using the official US customary standard conversion factor of 1 mph = 1.609344 km/h.
High precision needed for racing, aviation, and scientific applications. For everyday driving and speed limit understanding, whole numbers are sufficient.
Common mistake: Using approximate 1.6 km/h per mph. While close, the official standard is 1.609344 km/h. For long drives and fuel economy calculations, this approximation can add up. Also, confusing knots (nautical miles per hour) with mph.
| Item | MPH | KM/H |
|---|---|---|
| School zone | 25 | 40.2 |
| City street | 35 | 56.3 |
| Highway | 65 | 104.6 |
| Interstate | 75 | 120.7 |
| Bicycle | 15 | 24.1 |
1 mph equals approximately 1.609 km/h.
MPH is part of the US customary system and remains the standard for speed limits.
The official US customary standard defines 1 mph as exactly 1.609344 km/h.
60 mph equals approximately 96.56 km/h.
For quick estimates, 1.6 km/h per mph works. For accurate navigation and fuel calculations, use the exact 1.609344.
Most European countries use the metric system, so km/h is the standard for speed measurements.
Last Updated: 2026 · Reviewed by the UnitFig editorial team