Pace Calculator
Solve for pace, time or distance, then get your per-kilometre and per-mile pace, speed, race predictions and even splits.
Enter what you know
Race time predictions at this pace
| Distance | Finish time |
|---|
Kilometre splits
| Kilometre | Elapsed |
|---|
Pace, speed and time
speed = distance ÷ time
time = pace × distance
1 mile = 1.609344 km · marathon = 42.195 km · half marathon = 21.0975 km
Pace is time per unit of distance and speed is distance per unit of time, so they are two ways of saying the same thing. Runners think in pace because it is what you can hold in your head mid-race; cyclists think in speed. Once you know two of the three variables the third is fixed, which is all this tool does.
Using splits properly
The split table shows the clock time you should see at each kilometre if you run perfectly evenly. Most personal bests come from starting a few seconds per kilometre slower than target pace and finishing faster, so treat the even splits as a reference line rather than a rule. Race predictions assume the same pace can be held for the longer distance, which is optimistic beyond about double your current race distance.
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