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GPS Speed Calculator

Find average speed from two GPS coordinates and the elapsed travel time.

Inputs

Saved Scenarios

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Average Speed (km/h)

100.0

Distance (km)

343.56

Spark says

Formula

Speed=Great-Circle DistanceElapsed TimeSpeed = \dfrac{Great\text{-}Circle\ Distance}{Elapsed\ Time}
Great\text{-}Circle\ Distance
— Straight-line distance between the two GPS points

What is the GPS Speed Calculator?

This calculator derives average speed by dividing the great-circle distance between two GPS points by the elapsed travel time — useful for a rough sanity check of a logged trip.

How to use it

  1. 1 Enter the starting coordinates.
  2. 2 Enter the ending coordinates.
  3. 3 Enter the elapsed travel time in hours.

Worked examples

London to Paris in 3.44 hours

Average speed of about 100 km/h.

Try it

Limitations

  • •Uses straight-line distance, not actual route distance — for road trips, real average speed based on distance actually driven will normally be higher than this straight-line estimate suggests.

Frequently asked questions

Why might this show a lower speed than my actual driving speed?

Because it uses straight-line distance, not the (usually longer) distance actually traveled by road — the real average driving speed is typically higher than this estimate.

Sources & references