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Marathon Negative Split Target Pace Calculator

First half slower, second half faster — optimal negative split.

Calculates first-half and second-half target paces for a marathon negative split strategy from goal finish time and split percentage.

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

First_half = total_time × split_factor; Second = total − First

In depth

Calculates first-half and second-half target paces for a marathon negative split strategy from goal finish time and split percentage.