Running pace calculation enables structured marathon and half-marathon training. Setting realistic target paces prevents hitting the wall early in endurance races.
Running Pace Calculator
Reviewed
ResultUpdates as you type
Target Running Pace (min/km)5
Predicted 5k Time (min)25
Predicted 10k Time (min)52.1
- Predicted Half Marathon (min)
- 115
- Predicted Marathon (min)
- 239.8
Predict your 5k, 10k, Half Marathon, and Marathon race finish times and target running pace using Riegel’s formula.
Predict your 5k, 10k, Half Marathon, and Marathon finish times and calculate your exact target running pace.
How to use
- Choose your reference race distance (5k, 10k, Half Marathon, or Marathon).
- Enter your recent finish time for that distance.
- View your required target running pace and predicted race times for other distances.
Formula
The Riegel race time predictor models fatigue accumulation across increasing race distances.
Riegel Race Predictor Formula
T2 = T1 · (D2 / D1)^1.06Frequently asked questions
How accurate is Riegel’s race predictor formula?
Riegel’s formula is accurate within 1% to 3% for well-trained runners who build adequate aerobic volume for the target distance.
What is a good marathon target pace?
A good marathon target pace is one that allows consistent even or negative splits throughout all 42.2 kilometers.