Calorie Deficit calculator

How this estimate is calculated

Maintenance calories use Mifflin–St Jeor and your activity factor. Target = maintenance minus your selected deficit. The timeline uses a simplified 3,500 kcal per pound model, not a prediction of real weight loss.

Energy needs change as weight changes. This tool does not display targets below 1,200 kcal/day for female or 1,500 for male inputs. It is not a diet prescription or suitable for pregnancy, breastfeeding, or eating-disorder care.

• Mifflin–St Jeor resting energy equation
• NIDDK: Body Weight Planner

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