Speed Distance Time Calculator
Solve any one of speed, distance or time from the other two — the physics-class triangle, with unit conversions included.
Result
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How it works
Speed = distance ÷ time; distance = speed × time; time = distance ÷ speedFrequently Asked Questions
How do I calculate average speed?
Divide total distance by total time: 240 km in 3 hours is 80 km/h. For multi-leg trips, sum all distances and all times first — averaging the speeds directly gives the wrong answer.
How long will my trip take?
Time = distance ÷ speed: 240 km at 80 km/h is exactly 3 hours. The calculator shows the answer in hours and minutes.
How do I convert km/h to mph?
Divide by 1.609: 100 km/h ≈ 62.1 mph. The secondary readout shows your speed in both units automatically.