Miles per Hour (mph) to Kilometers per Hour (km/h) Converter
Enter a value to instantly convert between speed units.
1 Mile per Hour = 1.6093 Kilometer per Hour
Key Formulas
Kilometer per Hour → Mile per Hour
mph = km/h × 0.621371Mile per Hour → Kilometer per Hour
km/h = mph × 1.60934Knot → Mile per Hour
mph = kn × 1.15078Mile per Hour → Knot
kn = mph × 0.868976Formula
km/h = mph × 1.60934One mile per hour equals 1.60934 kilometers per hour. Miles per hour are used in the US, UK, and a few others. Kilometers per hour are the global standard. Cross the border into Canada or Mexico in your US rental car, and suddenly your speedometer reads mph but the road signs are in km/h—that's when you need this conversion to avoid a speeding ticket.
Source: NIST SP 811, Table B.8
Frequently Asked Questions
Real-World Examples
US residential zone or school zone speed limit. Slow urban driving to protect pedestrians.
25 mph = 40.23 km/h
US rural road speed limit. Common on smaller roads outside cities; matches European 90 km/h zones.
55 mph = 88.51 km/h
US interstate highway speed limit. Standard on major highways; similar to European 120 km/h motorways.
70 mph = 112.65 km/h
High speed or very fast driving. Illegal on most public roads; used for racing or hypothetical scenarios.
100 mph = 160.93 km/h