basic

Marathon Half Marathon Pace Converter Calculator

HM pace ≈ marathon pace × 0.96 (rule of thumb).

Converts marathon pace to estimated half-marathon pace and finish time using the common ~4% faster half-marathon pace heuristic.

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Marcus Laurent By Marcus Laurent
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

HM pace ≈ marathon pace × 0.96; HM time = HM pace × 21.0975 km

In depth

Converts marathon pace to estimated half-marathon pace and finish time using the common ~4% faster half-marathon pace heuristic.