Enter your figures
Enter the values below. Use the units shown beside each field.
Formula / methodRiegel model: T₂ = T₁ × (D₂ ÷ D₁)^1.06.
Your result
Calculated from your inputs.
Predicted race time
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Predicted time
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Predicted pace
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Reference note: This is a performance estimate based on the Riegel endurance model; actual results vary with fitness, distance and conditions.
How to use this calculator
What to enter
Enter or select the following as requested: Known distance; Known time; Target distance. Follow the units, valid ranges, examples, and options displayed beside each field.
What the result means
The result is an estimate based on the personal measurements or performance inputs entered and the method used by this calculator. It is not a medical diagnosis or individualized professional assessment; individual needs and conditions can differ.
When to use it
Use this for general planning or educational reference. For health symptoms, treatment, nutrition needs, or exercise limitations, seek guidance from a qualified professional.