Calorie Deficit Calculator
Calculate the calorie deficit needed to reach your weight loss goal.
Updated April 2026 · CalcFlow Editorial
Enter values above and click Calculate to see your results.
How to Use
- Enter current and goal weight.
- Enter height, age, and sex.
- Select activity level.
- Click Calculate.
Formula
To lose 1 lb/week: Deficit = 500 calories/day (3,500 cal = 1 lb fat)