How speed units relate

Speed is distance divided by time. One kilometer per hour equals exactly 1/3.6 meter per second. One international mile equals exactly 1,609.344 meters, so one mile per hour equals exactly 0.44704 meter per second.

Knots and navigation

A knot is one nautical mile per hour. The international nautical mile is exactly 1,852 meters, making one knot approximately 1.15078 mph or exactly 1.852 km/h. Knots are standard in marine and aviation contexts.

Speed is not pace

Speed measures distance covered per unit of time. Pace reverses that relationship and reports time per unit of distance, such as minutes per kilometer. Use the running pace calculator when you need pace or split planning.

This converter changes units only. Posted limits, instrument accuracy, wind, current, and relative motion require their own context.