Calculate your pace, finish time, or required speed for any race distance — 5K, 10K, half marathon, marathon, or custom.
| Race | Distance | Finish Time |
|---|
| km | Split Time | Elapsed |
|---|
Choose what you want to solve for — pace, finish time, or distance — then enter the other two values. Use the race distance quick-pick buttons for common distances, or enter a custom distance. The calculator shows your pace per kilometre or mile, equivalent speed, finish time, and a full splits table so you know exactly where you should be at each kilometre marker.
Pace is expressed as time per unit of distance (e.g. 5:30 min/km), while speed is distance per unit of time (e.g. 10.9 km/h). They are inverses of each other. Most runners think in pace during a race, while speed is more useful for comparing performance or programming training zones on a treadmill.
For a 5K, a sub-25 minute finish requires a pace around 5:00/km. For a marathon, qualifying for the Boston Marathon (men open 18–34) requires finishing under 3:00, which is approximately 4:16/km. Most recreational runners complete a marathon between 4:00 and 6:30/km.
Multiply your min/km pace by 1.60934. So a 5:00/km pace is 5:00 × 1.609 = 8:03/mile. To go the other way, multiply min/mile by 0.6214. The calculator handles this conversion automatically when you switch units.
A negative split means running the second half of a race faster than the first. It's widely considered the optimal race strategy for most distances — starting slightly slower than goal pace and gradually accelerating. Elite marathon runners almost always run negative splits in their fastest performances.
Enter your target finish time and distance (Find Pace mode). The splits table shows the exact elapsed time you should hit at each kilometre or mile marker. Screenshot or print this before your race to wear on your wrist or keep in your pocket.