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Weight Loss Weeks to Goal from Deficit Calculator

Weeks = weight_to_lose × 7700 / (deficit × 7).

Estimates the number of weeks needed to reach a weight loss goal based on the daily calorie deficit. Uses the 7,700 kcal/kg approximation for fat loss rate.

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

Weeks = (weight_to_lose_kg × 7700) / (daily_deficit_kcal × 7)

In depth

Estimates the number of weeks needed to reach a weight loss goal based on the daily calorie deficit. Uses the 7,700 kcal/kg approximation for fat loss rate.