How it's calculated
speed = distance ÷ time (d = v × t, t = d ÷ v)
distance, time and speed are converted to metres and seconds internally, then shown in your chosen units. Choose which of the three to solve; the other two are the inputs.
Common questions
What is the basic speed formula?
Speed equals distance divided by time, and the same relationship rearranges to find distance or time when you know the other two.
Can I mix units, like miles and hours?
Yes, you set the unit on each field, so entering miles and hours returns the speed in the unit you select.