Everyday Math
Intermediate

Weight Loss Estimate

Approximate body-mass loss from a calorie deficit (kg).

Formula

Δw=deficit×days7700\Delta w = \frac{\text{deficit} \times days}{7700}

Variables

deficitDaily kcal deficit
daysDuration

Example

500 kcal/day for 30 days ≈ 1.95 kg

Did You Know?

Roughly 7700 kcal equals one kilogram of body fat.

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