Sports/Betting
Marathon and Half-Marathon Time Predictor
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22 Oct 2025
About this Tool
Quickly estimate your target finish times for longer races (10K, Half-Marathon, Marathon) based on a recent performance. Simply select your known race distance and enter your finish time to see your predicted pace and potential.
Tool
Race Time Predictor
Estimate your future race times based on a recent race performance using Riegel's formula.
1. Your Recent Race Distance
Select the distance of the race you have already completed. Predictions are generally more reliable when comparing races of similar length.2. Race Finish Time (HH:MM:SS)
Enter your finish time for the selected distance in Hours, Minutes, and Seconds. Example: 00:22:30 for a 5K.Predicted Times
10K (6.2 miles)
00:00:00
Short distance prediction
Half-Marathon (21.1 km)
00:00:00
Mid distance prediction
Full Marathon (42.2 km)
00:00:00
Long distance prediction
*These estimates use Riegel's formula: $T_2 = T_1 \times (D_2 / D_1)^{1.06}$. They do not account for training, terrain, or environment.
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