Your Recent Race

How Race Prediction Works

Our race time predictor uses the Riegel formula (T₂ = T₁ × (D₂/D₁)^1.06), a widely-validated model that accounts for the non-linear relationship between race distance and performance.

The VDOT score is based on Jack Daniels' methodology, which combines your VO2max with running economy to give a single performance metric. This score determines your optimal training paces across all zones.

For best accuracy, use a recent race result (within the last 4-6 weeks) from a flat course where you gave maximum effort.