Marathon Time Predictor

Predict your finish time for a marathon (or any race distance) based on a recent race performance, using Riegel's exponential fatigue formula.

Inputs
Results
Predicted Time
230 minutes

Try an example

Formula

T2 = T1 × (D2/D1)^1.06, Riegel's formula

Learn How This Works

Predicting a Race Time and Converting Steps to Calories

Riegel's race prediction formula and the steps-to-calories conversion, worked through with real examples.

Training for Your First 5K: What the Pace Math Actually Tells You

How to use current pace and race prediction formulas to set a realistic 5K goal and track progress toward it.

Frequently Asked Questions

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