The calculator uses the common approximation of 7700 kcal per 1 kg of body mass to estimate the deficit or surplus required for the selected timeframe.
The result is informational and does not replace advice from a doctor, dietitian or coach. Be especially careful with large deficits and rapid weight gain.
✓Use the calculator to turn input values into a clear, repeatable result.
✓Keep units and assumptions visible so the calculation can be checked later.
✓Copy the result or key numbers for reports, messages or spreadsheets.
✓Reset to defaults when you want to compare another scenario from a clean state.
✓Calculators run in the browser and are useful for quick estimates before formal checks.
✓For finance, health, engineering or legal decisions, verify important results with a specialist or official source.
