Convert mph to km/h
Convert miles per hour to kilometers per hour with the 1.60934 factor. Covers vehicle speed limits, wind speeds, sports, and aviation speed references.
Speed
Detailed Explanation
Miles per Hour to Kilometers per Hour
The formula is:
km/h = mph × 1.60934
Speed Limit Conversions
| mph | km/h | Typical Use |
|---|---|---|
| 15 | 24.1 | School zone |
| 25 | 40.2 | Residential |
| 35 | 56.3 | Urban road |
| 45 | 72.4 | Suburban road |
| 55 | 88.5 | Rural highway |
| 65 | 104.6 | Interstate |
| 70 | 112.7 | Highway |
| 75 | 120.7 | High-speed highway |
| 85 | 136.8 | Texas fastest limit |
Wind Speed Scales
Weather reports use different speed units by region:
Beaufort Scale highlights:
| Description | mph | km/h |
|---|---|---|
| Calm | <1 | <1.6 |
| Light breeze | 4–7 | 6.4–11.3 |
| Moderate breeze | 13–18 | 20.9–29 |
| Strong wind | 25–31 | 40.2–49.9 |
| Gale | 39–46 | 62.8–74 |
| Hurricane | 74+ | 119+ |
Sports Speed References
| Sport / Context | mph | km/h |
|---|---|---|
| Average jogging | 5–6 | 8–9.7 |
| Usain Bolt top speed | 27.8 | 44.72 |
| Pro cycling sprint | 45 | 72.4 |
| Tennis serve (record) | 163.7 | 263.4 |
| Baseball pitch (fast) | 100 | 160.9 |
| NASCAR top speed | 200 | 321.9 |
| F1 top speed | 230 | 370.1 |
Quick Mental Math
Multiply by 1.6 for a close approximation:
- 60 mph × 1.6 = 96 km/h (exact: 96.56)
- 100 mph × 1.6 = 160 km/h (exact: 160.93)
Use Case
An American driver renting a car in Europe needs to understand the speedometer readings in km/h by mentally converting from their familiar mph reference points.