Physics
Average speed from distance and time — kilometres per hour and metres per second, plus pace per kilometre for runners and walkers.
Results update as you type. No calculate button. All calculations run locally in your browser.
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Average speed = distance ÷ time. Metres per second = km/h ÷ 3.6. Pace per kilometre = 60 ÷ speed in km/h, in minutes per kilometre.
100 km in 2 hours: average speed = 100 ÷ 2 = 50 km/h. In metres per second that is 50 ÷ 3.6 = 13.89 m/s. Pace = 60 ÷ 50 = 1.20 minutes per kilometre — that is 1 minute 12 seconds per kilometre.
This is average speed over the whole trip: it says nothing about how fast you went at any one moment. Stops, traffic, and hills are all folded into the average. Direction is ignored — this is speed (a scalar), not velocity as a vector, even though the two share the name in everyday use. Time must be above zero; a zero time gives no meaningful speed.
Average: total distance over total time. Your speedometer shows instantaneous speed, which can be higher or lower at any moment. A trip with stops can have a high speedometer reading and a low average.
Because 1 km/h = 1,000 metres per 3,600 seconds, and 1,000 ÷ 3,600 = 1 ÷ 3.6. So 50 km/h ÷ 3.6 = 13.89 m/s.
Pace is the inverse of speed: time per unit distance. Runners and walkers use it because "6 minutes per kilometre" is easier to hold steady than "10 km/h".
Not directly here: convert first (1 mile = 1.60934 km, minutes ÷ 60 = hours). The speed converter on this site converts the result afterwards.
No, if you enter total distance and total time. Note the trap: going 60 km/h out and 40 km/h back does not average to 50 km/h — the slower leg takes longer, so the true average over equal distances is 48 km/h.
Division by zero has no answer, so the page asks for a time above zero instead of showing infinity.
Results are estimates only and do not constitute professional advice.