Choosing the right speed conversion
Speed combines distance and time. Miles per hour and kilometers per hour are common on roads, meters per second is standard in scientific work, and knots are used for marine and aviation speed.
A converted speed describes the same rate of travel in a different unit. It does not account for stops, terrain, wind, route conditions, or changes in pace.
Common uses
- International speed limits
- Running and cycling comparisons
- Marine, aviation, and weather reports
In-depth speed conversion guides
These pages include page-specific scenarios, common mistakes, rounding guidance, sourced context, and a dated update record.
Quick speed utilities
These focused calculators provide a direct answer and the essential formula without requiring the longer background included in the in-depth guides.
Use converted values confidently
- One mph equals exactly 1.609344 km/h.
- One meter per second equals exactly 3.6 km/h.
- One knot equals one nautical mile per hour.