By Zencalcy Editorial TeamLast reviewed About us
Work out how long a run or race will take from your distance and your pace. Enter the distance and the pace you plan to hold, and the calculator returns the total finish time along with your average speed.
Work out your finish time from distance and pace.
finish time = distance × pace speed = distance ÷ finish time
The finish time assumes you hold one steady pace the whole way. Any slowing down would add time, so on a hilly or hot day treat the result as your best case.
| Symbol | Meaning |
|---|---|
| distance | The total distance of the run in kilometres or miles. |
| pace | The time per kilometre or per mile you plan to hold. |
| finish time | The total time the distance and pace produce. |
A half marathon distance of 21.0975 km at 5:00 per km finishes in 1:45:29, an average speed of 12 km/h. At a slightly slower 5:30 per km the same distance takes about 1:56:02.
Finish time is the arithmetic that ties pace and distance together. Multiply your pace by the distance and you get the total time. A pace of five minutes per kilometre over ten kilometres gives fifty minutes, which is exact as long as the pace is truly held across the whole distance.
The same relationship runs the other way: divide a known finish time by the distance to find the pace you actually ran. Because time, distance, and pace are three forms of one fact, knowing any two fixes the third without estimation.
When you predict a finish time rather than compute it from a completed run, the answer carries assumptions. Holding a pace evenly for a whole race is harder than it looks, particularly over long distances, so the predicted time is an idealised target based on steady effort.
You can combine this with a prediction formula for a new distance, or scale from a recent result, but the most realistic use is the direct one: given a pace you can actually sustain, the finish time follows exactly, and any gap between prediction and result points to pacing, terrain, or conditions.
Continue with the Half Marathon Pace Calculator, Marathon Pace Calculator, or the Race Time Prediction Calculator — or browse more running tools and all sports calculators.
It changes with pace. A faster pace, which is a lower minutes per kilometre figure, shortens the finish time in direct proportion.
Every result is computed locally in your browser from the formulas shown above. Nothing you type is uploaded, logged, or stored, and no account is required.
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Last reviewed: September 2026. See how we build and check every tool on the about page.
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Content updated: September 2026