Convert between miles per hour (mph) and kilometers per hour (kph) using the speed converters below. Each converter includes a calculator, conversion formula, examples, and a quick reference table.
Popular speed converters
MPH → KPH
Convert miles per hour to kilometers per hour.
KPH → MPH
Convert kilometers per hour to miles per hour.
MPH → MPS
Convert miles per hour to meters per second.
MPS → MPH
Convert meters per second to miles per hour.
Knots → MPH
Convert knots to miles per hour.
MPH → Knots
Convert miles per hour to knots.
How speed conversion works
Speed conversion works by multiplying or dividing a value by a fixed conversion factor. For example, one mile per hour equals 1.60934 kilometers per hour. These fixed ratios make speed conversions consistent and accurate.
Speed conversion formulas
Common speed conversions use fixed factors. Examples:
kph = mph × 1.60934
mph = kph × 0.621371
Common uses for speed conversion
- Driving and road speed limits
- Aviation and marine navigation
- Sports and fitness tracking
- Physics and engineering
About speed units
Miles per hour (mph) is used primarily in the United States and a few other regions. Kilometers per hour (kph) is used in most countries. Speed conversions are exact and use standard conversion factors.
Accuracy note
All speed conversions on this site use standard conversion factors. Results are rounded for clarity while maintaining practical accuracy.