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How to use Speed Calculator
Speed Calculator. Speed from distance and time. Divide by 3.6. 72 km/h = 20 m/s.
The short answer
To calculate speed, divide distance by time: 100 km in 1 hour 30 minutes is 100 ÷ 1.5 = 66.67 km/h. Enter any distance and time to get km/h, mph, m/s, knots and pace per km.
It runs in your browser. What you enter is not uploaded.
How to use it
Enter your values in the fields; defaults show a worked example.
Pick the units or options that apply to you.
Read the result, which updates instantly as you type.
Check the formula note under the result to see exactly how it was worked out.
Limits worth knowing
How do I convert km/h to m/s? Divide by 3.6. 72 km/h = 20 m/s.
What is pace? Time per kilometre, the inverse of speed, used by runners. 12 km/h is a 5:00 per km pace.