Average Speed Calculator

Calculate average speed from total distance and travel time, or from multiple journey segments each with their own distance and speed.

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Enter journey details Enter a distance and time to calculate average speed.

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Average speed: how to calculate it across one or many legs

An average speed calculator finds the mean speed for a journey from distance and elapsed time, or from multiple segments each with their own speed and distance. The result is always a time-weighted harmonic average, not a simple arithmetic mean of the speeds.

Why average speed is not the arithmetic mean of speeds

If you drive 50 km at 50 km/h and then 50 km at 100 km/h, your average speed is not 75 km/h. The first leg takes one hour and the second takes half an hour, so you cover 100 km in 1.5 hours, giving an average of 66.7 km/h. Arithmetic averaging ignores the time spent at each speed.

The correct approach is to divide total distance by total time. For a multi-segment journey the time per segment is the segment distance divided by the segment speed. Summing all segment times and dividing total distance by that total time gives the true average speed.

Average speed = Total distance / Total time

The universal formula for average speed over any journey.

Segment time = Segment distance / Segment speed

Time for each leg, used to find total elapsed time in multi-segment mode.

Practical uses

Average speed calculators are useful for road trips where rest stops and urban sections reduce overall pace, cycling or running events where pace varies by terrain, and logistics planning where delivery windows depend on realistic journey times.

When planning a journey you can enter each leg separately to model motorway, A-road, and urban segments at realistic speeds and see the overall average for the full trip.

Frequently asked questions

Why does my average speed feel lower than expected?

Slow segments have a disproportionately large effect because they take up more time. Spending 30 minutes at 20 km/h contributes 10 km but costs as much time as 60 km at 120 km/h, pulling the average down significantly.

 Can I use this for cycling pace?

Yes. Enter distance in kilometres or miles and time in hours and minutes for each segment. The result shows average speed in both km/h and mph, which you can use to estimate finish times or compare rides.

 What is the difference between average speed and average velocity?

Speed is a scalar (magnitude only) while velocity is a vector (magnitude and direction). Average speed is total distance divided by total time regardless of direction. Average velocity is displacement divided by time and equals zero for a round trip even if the car was moving the whole time.

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