Running Pace Calculator
Calculate running pace from distance and time, or finish time from distance and pace. Preset distances for 5K to marathon.
By Konstantin Iakovlev · Updated September 2026 · Source: ACE
Pace per Mile
8:03 /mi
Pace / Mile
8:03 /mi
Pace / Km
5:00 /km
Finish Time
25:00
Mile Splits
| Mile 1 | 8:03 |
| Mile 2 | 16:06 |
| Mile 3 | 24:08 |
| Mile 4 (partial) | 25:00 |
Equivalent Race Times
| 10K | 50:00 |
| Half Marathon | 1:45:29 |
| Marathon | 3:30:59 |
Equivalent race times assume even pacing and similar effort level across distances. Actual performance varies based on terrain, weather, training, and race conditions.
Use the Running Pace Calculator above to calculate your results. Enter your values and see instant results — all calculations run in your browser.
Disclaimer: This calculator is for informational purposes only. Results are estimates based on the information you provide and the assumptions described on this page.
How It Works
Pace is the thread that ties together speed, race prediction, and training plans, and this calculator hands you all three from a few inputs. Once you know the number, ambitious targets become concrete to chase, whether that is a sub-20 minute 5K or a Boston Marathon qualifying time. The arithmetic gets handled for you, leaving your attention on the running itself.
The relationship is direct: Pace = Time / Distance, and rearranged, Time = Pace * Distance. Run 10 kilometers in 50 minutes and your pace works out to 5 minutes per kilometer. Units are converted in the background, moving cleanly between minutes per kilometer, minutes per mile, and seconds per unit so the output stays precise no matter how you entered the numbers.
Where runners trip up is treating a flat-course pace as if it transfers untouched to a hilly or rough new route, when elevation and terrain reshape the effort entirely. Building a plan around one standout run rather than an average across several is another way to set a target you cannot sustain. The pace you actually hit on race day bends to weather, course conditions, and the fitness you bring with you, so leave room for the day to differ from the spreadsheet.
Example: Predicting a Half Marathon from a 10K
- 1 You ran a 10K training run in 48 minutes and 30 seconds and want to know what that pace means over a half marathon.
- 2 In Calculate Pace mode, choose 10K and enter 0 hours, 48 minutes, 30 seconds. That is 2,910 seconds over 10 km, or 291 seconds (4:51) per kilometer; over 6.214 miles it is 468 seconds, or 7:48 per mile.
- 3 The Equivalent Race Times table carries that pace to other distances: 291 seconds × 21.0975 km = 6,139 seconds, a half marathon of 1:42:19.
- 4 The calculator notes that equivalent times assume even pacing and similar effort across distances. Holding a 10K pace for more than twice as far is hard, so treat 1:42:19 as a best case when you set your race-day target.
Source: ACE · Last updated: September 2026
Frequently Asked Questions
What is a good running pace for beginners?
How do I convert pace to speed?
What is a good 5K time for an average runner?
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