Enter any two of time, distance, and pace — the third is calculated instantly.
Running pace is simply time divided by distance. This calculator solves the pace–time–distance triangle: pick which value you want to solve for, fill in the other two, and the answer appears instantly. Results are always shown in both minutes per kilometer and minutes per mile, along with the equivalent treadmill speed in km/h and mph, so you never need a separate conversion step.
For example, if you ran 10 km in 50 minutes, your pace is 50:00 ÷ 10 = 5:00 per kilometer, which is 8:03 per mile, or 12.0 km/h (7.5 mph) on a treadmill display. Going the other way, if you want to finish a half marathon (21.0975 km) at 5:30 per kilometer, your finish time will be 5:30 × 21.0975 ≈ 1:56:02.
Use the quick-select buttons for the four standard race distances — 5K, 10K, half marathon, and marathon — or type any custom distance in kilometers or miles.
It depends entirely on experience, age, and distance. For recreational runners, 5:30–7:00 per kilometer (roughly 9–11 minutes per mile) is a common training range. Race pace is faster than easy pace: most runners race a 5K 30–60 seconds per kilometer faster than their everyday run.
Multiply the pace in seconds per kilometer by 1.60934. For example, 5:00/km (300 seconds) × 1.60934 ≈ 483 seconds ≈ 8:03 per mile. This calculator does the conversion automatically and shows both.
A 4:00:00 marathon over 42.195 km works out to 5:41 per kilometer, or 9:09 per mile. In practice, plan a few seconds per kilometer faster to leave a buffer for aid stations and late-race slowdown.
Yes — the math is identical for any steady-speed activity. Enter your time and distance and the calculator returns pace and speed regardless of sport.
Pace is time per unit of distance (minutes per km or mile); speed is distance per unit of time (km/h or mph). They're reciprocals: 5:00/km equals 12 km/h. Runners usually think in pace, treadmills usually display speed — this tool shows both.