Average Speed Calculator

Average speed is the total distance divided by the total time: • Average speed = total distance ÷ total time When a trip has legs at different speeds, taking the plain average of the speeds gives the wrong answer, because you spend more time going slowly. Work out each leg's time as distance ÷ speed, then add them up. Example: 100 miles at 50 mph takes 2 hours and 100 miles at 100 mph takes 1 hour. That is 200 miles in 3 hours, so the average speed is 200 ÷ 3 ≈ 66.7 mph, not the plain average of 75 mph. When you drive the same route out and back at two different speeds, the average is the harmonic mean of the two. If you know the times instead, use the 'Distance and time' tab; times are entered in minutes. If stops should count toward the average, include them in that leg's time.