Calculate running pace, splits and finish times.
Pace = time ÷ distance. Running 10 km in 50 minutes is 5:00 per km (8:03 per mile) — about 12 km/h.
Pace is how long it takes to cover one kilometre or mile. Choose a race distance (or enter your own), add your time and this calculator gives your pace per km and per mile, your speed, a table of even splits and predicted times for other race distances using the Riegel formula. A second tool turns a target pace into a finish time.
Even pacing usually gives the best result; start no faster than your target pace. Predictions assume similar training for each distance. For general speed, distance and time see the Speed Calculator, and check intensity with the Target Heart Rate Calculator.
The calculator applies the standard published formulas step by step.
| Item | Value |
|---|---|
| Distance | 10 km (6.214 miles) |
| Time | 0:50:00 |
| Pace per km | 5:00 |
| Pace per mile | 8:03 |
| Speed | 12 km/h · 7.46 mph |
| Distance | Elapsed time |
|---|---|
| 1 km | 0:05:00 |
| 2 km | 0:10:00 |
| 3 km | 0:15:00 |
| 4 km | 0:20:00 |
| 5 km | 0:25:00 |
| 6 km | 0:30:00 |
| 7 km | 0:35:00 |
| 8 km | 0:40:00 |
| 9 km | 0:45:00 |
| 10 km | 0:50:00 |
| Race | Predicted time |
|---|---|
| 5K | 0:23:59 |
| 10K | 0:50:00 |
| Half marathon | 1:50:19 |
| Marathon | 3:50:01 |
| Time | Pace |
|---|---|
| 10 km in 45:00 | 4:30 per km |
| 10 km in 50:00 | 5:00 per km |
| 10 km in 60:00 | 6:00 per km |
| 10 km in 70:00 | 7:00 per km |
Divide your time by your distance. 50 minutes for 10 km is 5 minutes per kilometre.
Multiply by 1.609. A 5:00 per km pace is 8:03 per mile.
It depends on age and experience: many recreational runners finish a 10K in 50–70 minutes.
Most first-time marathoners run 5:45–7:30 per km (9:15–12:00 per mile). Choose a pace you can hold for 42 km.
The Riegel formula works best between similar distances and for well-trained runners. Heat, hills and fatigue change real times.
Running the second half faster than the first, a strategy many experienced runners use.
It uses the published formula: pace = time ÷ distance Riegel: T₂ = T₁ × (D₂ ÷ D₁)^1.06 The full method and a worked example are shown on this page.
No. The calculator gives general estimates for information and education. It cannot diagnose or treat anything, so please speak to a doctor or qualified professional about your own health.
Yes. Choose centimetres or feet and inches for height, and kilograms, pounds or stone for weight; the results are converted for you.
No. Everything is calculated in your browser and nothing you enter is uploaded or saved.
