Estimate a marathon finish-time range from a recent race.
Preparing calculator…
The Riegel model assumes sufficient endurance training. A ±5% interval is shown; weather, route, fuelling and pacing can cause larger differences.
Not a diagnosisFor general health education and estimation only. It does not diagnose a condition and is not treatment, medication, diet or training advice.
T₂ = T₁ × (D₂ / D₁)^1.06Healthy runners with recent performance over at least 5 km and an established endurance base.
Not reliable for new runners, injury recovery, very short tests or runners without long-distance preparation.
Input accuracy, measurement technique, rounding and individual variation all affect the result. Internal precision is retained and only displayed values are rounded.
Stop and seek care for chest pain, collapse, confusion or other danger signs during training or racing.