Running Pace Calculator
Pace, distance, time — give two, get the third. Plus splits for popular race distances.
Splits at This Pace
Pace vs Speed
Runners almost always use pace (time per distance, e.g. 5:30/km or 8:51/mi) rather than speed (distance per time, e.g. 11 km/h) because pace is the number you actually see on your GPS watch and can target during a run. The conversion is simple: pace = time ÷ distance. The Wikipedia article on running economy covers why pace matters as a training metric.
Why even pacing beats "go out fast"
Analysis of New York City Marathon finishers from RunRepeat and other large datasets consistently shows:
| Pacing Strategy | % of Finishers | Outcome |
|---|---|---|
| Positive split (faster first half) | ~70% | Average; many crash in last 10K |
| Even split (±1% half-to-half) | ~20% | Strongest finish times for trained runners |
| Negative split (faster second half) | ~10% | Best for personal bests; world records typically negative-split |
Going out too fast triggers anaerobic energy systems that burn glycogen rapidly and produce lactate that can't be cleared at marathon pace. The "wall" at mile 20 is mostly a glycogen-depletion problem made worse by early overpacing.
Race Time Benchmarks
From Runner's World and major race results, rough benchmarks for adult runners:
| Distance | Beginner | Recreational | Competitive | Elite (M) | Elite (F) |
|---|---|---|---|---|---|
| 5K | 30:00+ | 25:00 | 20:00 | 13:00-15:00 | 14:30-17:00 |
| 10K | 1:00:00+ | 52:00 | 42:00 | 27:00-31:00 | 30:00-35:00 |
| Half Marathon | 2:15:00+ | 1:55:00 | 1:30:00 | 59:00-1:03 | 1:05-1:10 |
| Marathon | 5:00:00+ | 4:00:00 | 3:10:00 | 2:05-2:10 | 2:15-2:25 |
Frequently Asked Questions
What's a good 5K time?
Hugely dependent on age, sex and training. Median U.S. 5K time is around 30-35 minutes. Sub-25 is solid recreational; sub-20 is competitive amateur; sub-15 men / sub-17 women is elite level.
How do I improve my pace?
Three levers: more easy aerobic mileage (Zone 2), threshold workouts once a week (tempo runs at ~85% effort), and intervals at VO₂max pace (200m-1km hard repeats). The 80/20 polarized model works for most runners.
What's "marathon pace"?
For most amateurs, your sustainable marathon pace is about 75-85% of your 5K pace. So a 25-minute 5K runner (5:00/km) will typically run a marathon at ~6:00-6:30/km, finishing 4:15-4:30.