Convert Miles Per Hour to Kilometers Per Hour & KPH to MPH
Welcome to the most simple and accurate MPH to KPH speed converter online! Whether you are driving abroad, watching a sports event, checking weather forecasts, reading car specifications, or planning a road trip, converting between miles per hour (mph) and kilometers per hour (kph) is something millions of people need every single day.
Our free bidirectional speed converter works both ways:
🚗 MPH → KPH (Miles Per Hour to Kilometers Per Hour)
🚗 KPH → MPH (Kilometers Per Hour to Miles Per Hour)
Enter your speed value, select your conversion direction, and get your instant, precise result — no calculations required!
How do I convert MPH to KPH?
To convert MPH to KPH, multiply the speed in miles per hour by 1.60934:
KPH = MPH × 1.60934
| MPH | KPH |
|---|---|
| 30 mph | 48.28 kph |
| 60 mph | 96.56 kph |
| 100 mph | 160.93 kph |
Why Convert Between MPH and KPH?
The world is divided between two major speed measurement systems:
| System | Unit | Used In |
|---|---|---|
| Imperial System | Miles Per Hour (mph) | USA, UK, Liberia, Myanmar |
| Metric System | Kilometers Per Hour (kph/kmh) | Most of the world |
Why does the UK use mph but most of Europe uses kph?
The United Kingdom has historically used the Imperial system of measurement, including miles for road distances and mph for speed limits. Despite the UK officially adopting many metric measurements, road signs and speed limits have remained in miles and mph. The rest of Europe adopted the metric system, using kilometers and kph as standard.
What is the fastest speed ever recorded?
The fastest speed ever recorded by a manned vehicle was during the Apollo 10 mission in 1969, which reached approximately:
- 🚀 24,791 mph (39,897 kph)
as the spacecraft re-entered Earth’s atmosphere.
What is the difference between kph and kmh?
KPH and KMH are the same thing!
- kph = kilometers per hour
- km/h = kilometers per hour
- kmh = kilometers per hour
All three abbreviations refer to the exact same unit of speed. The official SI symbol is km/h, but kph and kmh are widely used and universally understood.