Calorie Burn Calculator — Cycling Calories from Power
Estimate calories burned cycling based on power output and duration.
How We Calculate This
Calorie Calculation from Power
Mechanical Energy (kJ) = Power (W) x Duration (s) / 1000
Total Calories = Mechanical Energy / Efficiency / 4.184
Where efficiency is approximately 0.24 (24%) for cycling, and 4.184 converts kilojoules to kilocalories.
A useful shortcut: kJ from your power meter roughly equals kcal burned (because 1/0.24/4.184 is close to 1).
Frequently Asked Questions
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Last updated: 2025-02-20
All calculations are estimates. Always verify results and consult a professional bike fitter where appropriate.