Pace calculator — running pace, time, and distance
Given any two of distance, time, and pace, this running pace calculator solves for the third instantly. Switch between kilometers and miles, tap race presets (5K, 10K, half marathon, marathon), and use three modes: find pace, find finish time, or find distance. Cross-check unit conversions with miles to km or estimate energy needs with the calorie calculator.
The three formulas
- Pace = total time ÷ distance (e.g. minutes per kilometer)
- Time = pace × distance
- Distance = total time ÷ pace
Pace is usually expressed as min:sec per km or per mile. A 5:00/km pace means five minutes to cover each kilometer; a 10K at that pace takes 50 minutes before rounding.
Benchmark paces
| Goal | km pace | mile pace |
|---|---|---|
| Easy jog | 7:00–8:00 /km | 11:15–12:52 /mi |
| Recreational 5K | 5:30–6:30 /km | 8:51–10:28 /mi |
| Sub-25 min 5K | ≤ 5:00 /km | ≤ 8:03 /mi |
| Sub-2 h half marathon | ≤ 5:41 /km | ≤ 9:09 /mi |
| Sub-4 h marathon | ≤ 5:41 /km | ≤ 9:09 /mi |
Race planning examples
5K in 25 minutes → 25 ÷ 5 = 5:00/km average. Half marathon under 2 hours → 120 min ÷ 21.0975 km ≈ 5:41/km. Use “Find pace” with your goal time and distance preset to verify splits before race day.
Training paces should include easy days slower than race pace, tempo efforts near lactate threshold, and intervals faster than goal pace—this calculator handles the arithmetic; a coach or plan sets the physiology.
Treadmill vs outdoor
Treadmills often display pace per mile or km directly. Outdoor GPS watches estimate pace from speed; hills, wind, and stops affect averages. For steady treadmill runs, enter distance and time here to double-check the console reading.
FAQs cover good 5K paces and sub-2-hour half marathon targets.