Speed Distance Time Calculator

Work out speed, distance or time — enter any two and this calculator solves for the third. Handy for travel planning, running, driving and physics homework alike.

The Three Formulas

Speed, distance and time are linked by one relationship, rearranged three ways:

Speed = Distance ÷ Time Distance = Speed × Time Time = Distance ÷ Speed

A memory aid is the “DST triangle”: cover the value you want, and the other two show you whether to multiply or divide.

Watch Your Units

The most common mistake is mixing units — dividing miles by minutes gives you miles per minute, not mph. This calculator normalizes everything for you, but if you do it by hand, convert first:

• km/h → m/s: divide by 3.6
• mph → km/h: multiply by 1.609
• minutes → hours: divide by 60

Measure the Distance First

Solving for time or speed needs an accurate distance. Measure the real route on a map with the distance calculator, or work out the straight-line distance with the distance between coordinates tool. For a whole trip, the average speed calculator handles stops and varying pace.

Get Distance Measure

Download Distance Measure for iOS and start measuring in seconds.