Running Pace Calculator
Calculate your running pace, speed and finish time for any race distance. 5K, 10K, half marathon, marathon — with per-km split table and pace zones.
| Split | Split time | Elapsed |
|---|
Running pace explained
Running pace is the time it takes to cover one unit of distance (min/km or min/mile). Speed is distance per time (km/h or mph). This calculator finds either — just enter the other two values.
5K: Sub-30min = 6:00/km, Sub-25min = 5:00/km. 10K: Sub-60min = 6:00/km, Sub-50min = 5:00/km. Half marathon: Sub-2hr = 5:41/km. Marathon: Sub-4hr = 5:41/km, Sub-3:30hr = 4:58/km.
Easy (Z1-2): conversational pace, 70-80% of max HR. Tempo (Z3): comfortably hard, 80-87% max HR. Threshold (Z4): hard, 87-93% max HR. Interval (Z5): very hard, 93%+ max HR.
Running the second half faster than the first. Elite marathoners use this strategy. It prevents going out too fast, conserves glycogen stores and results in faster overall times. Start 10-15 sec/km slower than goal pace.
Speed (km/h) = 60 ÷ Pace (min/km). Pace (min/km) = 60 ÷ Speed (km/h). To convert min/km to min/mile: multiply by 1.609. To convert mph to km/h: multiply by 1.609.