Marathon Time Predictor

The Marathon Time Predictor substitutes your inputs (5K time (min)) into the standard expression: Marathon (min) = 5K time (min) × 9.6. Every variable is read straight from the fields on this page, and the result is computed the moment you enter the values.

1. 1

   Step 1

   Enter your weight and activity level.

2. 2

   Step 2

   Click the "Calculate" button to see the result instantly.

3. 3

   Step 3

   Use the result while keeping the context and units in mind.

4. 4

   Step 4

   Review the breakdown: the result repeats the page's own expression (Marathon (min) = 5K time (min) × 9.6) with your values substituted, so each variable stays traceable.

5. 5

   Step 5

   Compare scenarios by varying a single value per run in the marathon time predictor — that isolates which of the formula's inputs actually drives the result.

• 1

  The Marathon Time Predictor needs every variable in consistent units — 5K time (min) — before the standard formula returns a valid result, so check each field's unit before entering values copied from elsewhere.

• 2

  Read implausible results with suspicion: if the Marathon Time Predictor output sits orders of magnitude away from your expectation, re-read the inputs — a misplaced decimal or two swapped fields explains most nonsensical answers.

• 3

  For repeated what-if work on Marathon Time Predictor, change one input at a time and note the effect; that isolates which variable actually drives the result instead of moving several values at once and losing the attribution.

• Implausible inputs make worthless outputs: a result computed from estimates, brochure figures, or copied numbers inherits every one of their errors. Feed measured values into the Marathon Time Predictor, then sanity-check the output against a rough expectation.

• Mixed units skew a Marathon Time Predictor silently: the standard formula assumes one unit system across all inputs, and no warning fires when centimeters meet meters or months meet years. Standardize every input to its field's stated unit first.