Pace Calculator
Enter distance and time to find pace, or enter pace and distance to find time.
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Common Race Distances
| Race | Miles | Kilometers |
|---|---|---|
| 5K | 3.107 | 5.0 |
| 10K | 6.214 | 10.0 |
| 15K | 9.321 | 15.0 |
| Half Marathon | 13.109 | 21.097 |
| Marathon | 26.219 | 42.195 |
| 50K Ultra | 31.069 | 50.0 |
How to Calculate Running Pace
Running pace is the time it takes to cover one mile or one kilometer. A 9:00/mile pace means you run each mile in 9 minutes.
To find your pace, divide your total time by the distance. To predict a finish time, multiply your pace by the race distance.
Pace (minutes per mile or minute per km) = time / distance. A 5K (3.107 miles) run in 25 minutes has a pace of 25 / 3.107 = 8:03 per mile. To find finish time from pace: time = pace × distance. An 8:00/mile pace for a half marathon (13.1 miles) = 8 × 13.1 = 104.8 minutes = 1:44:48.
Converting between pace and speed: speed (mph) = 60 / pace (min/mile). An 8:00/mile pace equals 60/8 = 7.5 mph. A treadmill set to 7.5 mph runs at exactly that pace. Conversely, pace (min/mile) = 60 / speed (mph).
Negative splits — running the second half of a race faster than the first — is the strategy most associated with personal records and even-effort execution. A 1–2% speed increase in the second half reflects proper pacing. Most runners go out too fast in the first mile, especially in shorter races.
Easy runs should be at conversational pace — typically 60–90 seconds per mile slower than 5K race pace, or the pace where you can speak in full sentences. Running too fast on easy days delays recovery and doesn't add meaningful aerobic stimulus beyond what the easy pace provides.
See also: Race Predictor · Heart Rate Zones