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Race Time Predictor Calculator

For example 5, 10, 21.0975 (half marathon) or 42.195 (marathon).
Worked example result
Predicted finish time (h:mm:ss)3:50:01
Predicted pace per km5:27
Predicted pace per mile8:46

A 50:00 10K predicts a marathon of about 3:50:01 — an average of 5:27 per km — assuming marathon-specific training.

Predicted time T2 = known time T1 × (target distance D2 ÷ known distance D1)^1.06 (Riegel, 1977) · Powered by CalcHub — Race Time Predictor Calculator