Running Pace Calculator
Pace, splits and race predictions for 5K to marathon
Your Run
::
e.g. a 4-hour marathon → 4 : 0 : 0
:
Marathon · average pace
9:09 /mi
Finish time4:00:00
Pace per km5:41 /km
Pace per mile9:09 /mi
Average speed-
Split Times
| Point | Elapsed |
|---|
Elapsed time at each 5 km checkpoint if you hold an even pace — handy for pacing bands and race-day checks.
Race Time Predictor (Riegel formula)
| Distance | Predicted time | Pace |
|---|
Predicted time = time × (new distance ÷ old distance)1.06. Most runners need solid endurance training to hit the marathon prediction from a 10K or half result.
Marathon Pace Chart (26.2 mi)
| Goal | /km | /mile | Halfway | km/h |
|---|---|---|---|---|
| 2:30 | 3:33 | 5:43 | 1:15:00 | 16.9 |
| 2:45 | 3:55 | 6:18 | 1:22:30 | 15.3 |
| 3:00 | 4:16 | 6:52 | 1:30:00 | 14.1 |
| 3:15 | 4:37 | 7:26 | 1:37:30 | 13.0 |
| 3:30 | 4:59 | 8:01 | 1:45:00 | 12.1 |
| 3:45 | 5:20 | 8:35 | 1:52:30 | 11.3 |
| 4:00 | 5:41 | 9:09 | 2:00:00 | 10.5 |
| 4:15 | 6:03 | 9:44 | 2:07:30 | 9.9 |
| 4:30 | 6:24 | 10:18 | 2:15:00 | 9.4 |
| 5:00 | 7:07 | 11:27 | 2:30:00 | 8.4 |
| 5:30 | 7:49 | 12:35 | 2:45:00 | 7.7 |
| 6:00 | 8:32 | 13:44 | 3:00:00 | 7.0 |
An exact 3:00:00 is 6:52 per mile, so sub-3 means holding 6:51 per mile (4:15 /km) or faster all the way; sub-4 is 9:09 per mile and sub-5 is 11:26 per mile.
Half Marathon Pace Chart (13.1 mi)
| Goal | /km | /mile | 10 km split | km/h |
|---|---|---|---|---|
| 1:15 | 3:33 | 5:43 | 35:33 | 16.9 |
| 1:20 | 3:48 | 6:06 | 37:55 | 15.8 |
| 1:30 | 4:16 | 6:52 | 42:40 | 14.1 |
| 1:40 | 4:44 | 7:38 | 47:24 | 12.7 |
| 1:45 | 4:59 | 8:01 | 49:46 | 12.1 |
| 1:50 | 5:13 | 8:23 | 52:08 | 11.5 |
| 2:00 | 5:41 | 9:09 | 56:53 | 10.5 |
| 2:15 | 6:24 | 10:18 | 1:03:59 | 9.4 |
| 2:30 | 7:07 | 11:27 | 1:11:06 | 8.4 |
| 2:45 | 7:49 | 12:35 | 1:18:12 | 7.7 |
| 3:00 | 8:32 | 13:44 | 1:25:19 | 7.0 |
10K Pace Chart
| Goal | /km | /mile | 5 km split | km/h |
|---|---|---|---|---|
| 35:00 | 3:30 | 5:38 | 17:30 | 17.1 |
| 40:00 | 4:00 | 6:26 | 20:00 | 15.0 |
| 45:00 | 4:30 | 7:15 | 22:30 | 13.3 |
| 50:00 | 5:00 | 8:03 | 25:00 | 12.0 |
| 55:00 | 5:30 | 8:51 | 27:30 | 10.9 |
| 60:00 | 6:00 | 9:39 | 30:00 | 10.0 |
| 65:00 | 6:30 | 10:28 | 32:30 | 9.2 |
| 70:00 | 7:00 | 11:16 | 35:00 | 8.6 |
| 80:00 | 8:00 | 12:52 | 40:00 | 7.5 |
World Marathon Majors — When They Run
| Month | Race |
|---|---|
| March | Tokyo |
| April | Boston · London |
| Late Aug / Sep | Sydney · Berlin |
| October | Chicago |
| November | New York City |
Typical race months; check each race website for exact dates and qualifying times.
Formulas & Sources
- Pace = time ÷ distance · 1 mile = 1.609344 km · half marathon 21.0975 km, marathon 42.195 km
- Race prediction: Peter Riegel (1981), T2 = T1 × (D2/D1)^1.06
- Times rounded to the nearest second
Last reviewed: 2026-10-19
FAQ
What pace is a 4-hour marathon?
A 4:00:00 marathon is 9:09 per mile (5:41 per km), about 6.6 mph. You need to pass halfway in 2:00:00.
What pace do I need for a sub-3 marathon?
Hold 6:51 per mile (4:15 per km) or faster for all 26.2 miles — roughly 21:20 for every 5 km.
How do I predict my marathon time from a 10K?
Use the Riegel formula: time × (distance ratio)^1.06. A 50-minute 10K predicts about 3:50 for the marathon, but only with enough long-run training.
How do I convert pace to speed?
Speed (mph) = 60 ÷ pace in minutes per mile. A 10:00 mile is 6 mph; an 8:00 mile is 7.5 mph.
How do I convert km pace to mile pace?
Multiply the per-km pace by 1.609. A 5:00 /km pace equals 8:03 per mile.