Running Splits Calculator (Even Pace per km or Mile, Split Table)
Even-pace splits for a target finish time, with the elapsed time at every split and the pace in km and miles.
Inputs
| At | Split | Elapsed |
|---|---|---|
| 5 km | 26:00 | 26:00 |
| 10 km | 26:00 | 52:00 |
- Working
- 52:00 ÷ 10 km = 312.0 s per km = 5:12/km; × 5 = 26:00
- Average pace per km
- 5:12/km
- Average pace per mi
- 8:22/mi
- Speed
- 11.54 km/h
- Splits in the race
- 2
Use this calculator on your own site
Free embed
- Two lines of HTML, unlimited views
- Shows a small CalculateEveryday bar, with a credit link under the calculator
What each Running Splits input means
- Race distance
- The race or run distance, in km or miles: 5, 10, 21.0975 for a half marathon, 42.195 for a marathon (13.1094 and 26.2188 miles).
- Hours
- The hours in the finish time — 0 for anything under an hour.
- Minutes
- The minutes in the finish time.
- Seconds
- The seconds in the finish time.
- Split distance
- The split length you want times for: 1 for every kilometre or mile, 5 for 5 km checkpoints.
- Units
- Metric (km, kg) or US units (miles, pounds). The distance and split length switch between kilometres and miles together.
Running Splits formula
pace = finish time ÷ distance · split time = pace × split distance · elapsed at split n = n × split time · min/mi = min/km × 1.609
Splits are the times at which you need to pass each marker to finish on target if you run evenly. Divide the goal time by the race distance for the pace, multiply by the split distance for each split, and add them up for the elapsed time at each marker — which is the number on the pace band on your wrist. The page also gives the pace in the other unit, because most watches show min/km and most US races mark miles: 5:00/km is 8:03/mi. A marathon in 3:30 needs 8:01 per mile, or 4:59 per kilometre, from the first mile to the last.
Running Splits worked example
10 km in 52:00 is 3,120 seconds; 3,120 ÷ 10 = 312 seconds per kilometre, which is 5:12/km (8:22/mi). Each 5 km split is 5 × 5:12 = 26:00, so the table reads 26:00 at 5 km and 52:00 at 10 km. With 1 km splits it would list 5:12, 10:24, 15:36 and so on to 52:00.
More Running Splits examples
A sub-2-hour half marathon, 1:59:00: 7,140 s ÷ 21.0975 km = 338.4 s, a 5:38/km pace (9:05/mi), so every 5 km should pass in 28:12.
A 4-hour marathon in miles: 14,400 s ÷ 26.2188 mi = 549.2 s, so each mile in 9:09 — 5:41 per kilometre.
Where the Running Splits calculator can give the wrong answer
- Even splits are the plan, not the usual outcome. Most runners go out fast and slow down; the fastest marathons are run with slight negative splits — a second half a little quicker than the first. Use the table as the ceiling for the first half rather than a target to beat.
- A race that is not a whole number of splits gets a short last row: a marathon at mile splits ends with a 0.2-mile split of 1:36 at 8:01 pace.
- GPS watches usually measure long on a certified course because runners do not run the tangents, so a watch showing 42.4 km at the finish of a marathon has been reporting a pace slightly faster than the course pace.
- Hills, wind and heat are not in the arithmetic. A hilly course needs a slower first-half pace than an even split suggests.
- Split distances over the race distance are pointless and give one row; splits under 100 m give a table too long to be useful, so the table stops at 60 rows.
Spotted a mistake? Tell us
Running Splits reference table
| Pace per km | 5K | 10K | Half marathon | Marathon | Pace per mile |
|---|---|---|---|---|---|
| 4:00 | 20:00 | 40:00 | 1:24:23 | 2:48:47 | 6:26 |
| 4:30 | 22:30 | 45:00 | 1:34:56 | 3:09:53 | 7:15 |
| 5:00 | 25:00 | 50:00 | 1:45:29 | 3:30:58 | 8:03 |
| 5:30 | 27:30 | 55:00 | 1:56:02 | 3:52:04 | 8:51 |
| 6:00 | 30:00 | 1:00:00 | 2:06:35 | 4:13:10 | 9:39 |
| 6:30 | 32:30 | 1:05:00 | 2:17:08 | 4:34:16 | 10:28 |
| 7:00 | 35:00 | 1:10:00 | 2:27:41 | 4:55:22 | 11:16 |
Running Splits FAQ
- Divide the goal time by the distance for the pace, then multiply the pace by each split marker. A 5K in 25:00 is 5:00/km, so the splits are 5:00, 10:00, 15:00, 20:00 and 25:00 at each kilometre. Enter the race and the split length and the page prints the table.
- 4:00:00 over 42.195 km is 5:41/km, or 9:09/mi; 3:30:00 is 4:59/km, 8:01/mi. Half marathon in 2:00 is 5:41/km as well. Enter the distance and time and the average pace appears in both units.
- Multiply by 1.609: 5:00/km is 5 × 1.609 = 8.05 minutes, so 8:03/mi. Going the other way, divide: 8:00/mi is 4:58/km. The page shows both for every result.
- Running the second half of a race faster than the first. Most distance records are set that way, because starting slightly under goal pace saves energy for the end. To plan negative splits, set the first half's target a few seconds per kilometre slower than the even pace here and make it back after halfway.