DIY Cost Tools
Speed Converter
CONVERSION CALCULATOR
Convert speed between miles per hour, kilometers per hour, meters per second, feet per second, and knots.
How it works
All entries are converted through meters per second, which provides one consistent base for linear speed units.
Conversion formula
Converted speed = entered speed × source factor in m/s ÷ destination factor in m/s.
Worked example
60 miles per hour equals exactly 96.56064 kilometers per hour.
Important limits
- These are scalar speed conversions and do not include direction.
- Knots are nautical miles per hour.
- Travel time still depends on stops, route conditions, and changing speed.
Frequently asked questions
What is one mph in km/h?
One mile per hour equals exactly 1.609344 kilometers per hour.
Is a knot the same as mph?
No. One knot is one nautical mile per hour, about 1.15078 mph.
Using speed conversions correctly
Speed relates distance to time, so confirm that the source value uses the intended units before converting. Miles per hour, kilometers per hour, meters per second, feet per second, and knots are common in different fields. A knot is one nautical mile per hour, not one statute mile per hour.
The conversion preserves the same physical speed but does not change whether the value is average, instantaneous, ground, air, or water speed. For travel planning, stops and changing conditions mean an average speed may not predict arrival time precisely. Retain extra decimal places for engineering or scientific work and round the final result to match the accuracy of the measured distance and time.
Review notes
Factors use exact international mile, foot, hour, and nautical-mile relationships. Last reviewed September 30, 2026.