Enter any two of distance, time, or pace, and get the third plus a full mile-by-mile split table.
| Mile | Split Time | Cumulative |
|---|
Enter a distance and a time, and the page returns your average pace per mile plus a split table for every mile of the race. The distance buttons set the standard marks: 5K, 10K, half marathon and marathon. Type over the distance if your course is a different length — a measured training loop, or a race with an unusual course.
The splits assume even pacing, which is a planning tool rather than a prediction. Very few runners hold an identical pace for every mile; most positive-split by a few seconds in the last third. Use the table to know what a target pace feels like, then adjust on the day.
A 5K in 25:00 is 3.10686 miles, so the average pace is 25 minutes divided by 3.10686 — about 8:02 per mile.
| Marker | Elapsed |
|---|---|
| 1 mile | 8:02 |
| 2 miles | 16:05 |
| 3 miles | 24:07 |
| 5K finish | 25:00 |
The last 0.11 of a mile takes about 53 seconds, which is why the 3-mile split is not the finish time and why runners who check their watch at the 3-mile mark and panic are panicking about arithmetic. If you want 25:00, the number to hold is 8:02 per mile, or 5:00 per kilometre if your watch reads in metric.
Pace is a rate, so it does not scale linearly with distance in real life even though the maths here does. Running 5K at 8:02 per mile and a marathon at the same pace are very different efforts: the marathon demands fuel and durability that the 5K never tests. Use this calculator for the conversion and your training log for the realism.
Even splits are the fastest way to run a distance you have not raced before, because the alternative — going out too fast — costs more in the second half than it gains in the first. A useful habit is to run the first mile a few seconds slower than target and let the pace come to you.
Course and conditions move the number more than most runners expect. Heat, hills and wind all slow a given effort, so a pace that felt easy in March can feel like a race in July. Compare performances by effort and conditions, not by the raw split alone.
Divide the mile pace in seconds by 1.609. An 8:02 mile is 482 seconds, which is 5:00 per kilometre.
It is 3.10686 miles, or 5,000 metres. The difference matters over a short race: rounding to 3.1 miles makes the pace look about half a second slower.
Because you did not run even splits, which is normal. The table is a plan, not a recording of your race.
Yes for pace, with a caveat: treadmill belts are calibrated variably, and running without wind resistance is easier than running outdoors at the same displayed speed.
One where you can hold a conversation. Pace follows fitness; setting a number before you have the base tends to produce injury rather than speed.
The mile conversions of the standard road distances are what the presets use: 5K is 3.10686 miles, 10K is 6.21371, the half marathon is 13.1094, and the marathon is 26.2188.
Last updated: November 2, 2026. Reviewed by David Liu.