Weight Loss Projection Calculator

Formula

deficit × days ÷ 7700

Worked example

500 kcal/day for 30 days — about 1.95 kg

Quick answer

What does the Weight Loss Projection Calculator do?

Estimate theoretical weight change from a sustained calorie deficit using 7,700 kcal per kg as a rough energy equivalent.

What is the Weight Loss Projection Calculator?

Estimate theoretical weight change from a sustained calorie deficit using 7,700 kcal per kg as a rough energy equivalent. Use it when you have the required inputs and want a deterministic, repeatable result with the calculation method visible.

How to use this calculator

Enter the values requested by the tool, keep units and time periods consistent, resolve any validation message, calculate, then review the primary answer together with the displayed formula and supporting values.

Formula and method

This calculator uses the deterministic formula deficit × days ÷ 7700. Enter the required values, then review the displayed substitution and result breakdown to verify the calculation.

Worked example

500 kcal/day for 30 days about 1.95 kg

Common mistakes to avoid

Check units, decimal points, percentages, signs, date/time order, selector choices, and rounding. For important decisions, verify the result against an independent source or qualified professional when appropriate.