Free Race Time Prediction calculator with clear step-by-step results.
Riegel's formula scales a race time by the distance ratio raised to ~1.06.
Formula
Prediction = known time × (target/known)^1.06
Estimates are general guidance — consult a healthcare professional for personal medical advice.
Riegel's formula scales a race time by the distance ratio raised to ~1.06.
Assumes even pacing and comparable conditions.