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Energy Expenditure from Cycling Power and Duration Calculator

Kilojoules and kcal from average watts and ride duration.

Calculates energy expenditure: kJ = power(W) × duration(s) / 1000. At ~22% efficiency, kcal ≈ kJ × (1/4.184) / 0.22 = kJ / 0.92 (rough metabolic equivalent).

Marcus Laurent By Marcus Laurent
Published Last reviewed 1 min read

Inputs

W
s
%

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

kJ = Power × seconds / 1000; kcal ≈ kJ × 1.088

In depth

Calculates energy expenditure: kJ = power(W) × duration(s) / 1000. At ~22% efficiency, kcal ≈ kJ × (1/4.184) / 0.22 = kJ / 0.92 (rough metabolic equivalent).