Calorie Deficit Calculator
Compare maintenance calories with a modest calorie reduction, without promising a weight-loss date.
Tool inputs stay in your browser · optional AI search sends your query
Good to know: Comparison intake = maintenance − chosen reduction. Conservative product limits block results below 1,200 kcal or reductions above 25%; they are not universal medical safety thresholds. Educational food-planning arithmetic, not medical advice. Food labels and estimates can vary. Use a clinician or registered dietitian for a personalized plan, especially for children, pregnancy, breastfeeding, medical conditions, or an eating-disorder history.
How to use it (step by step)
- 1Read the adult eligibility statement. Leave it unconfirmed if it does not apply to you.
- 2Enter maintenance calories from an estimate or care plan, then a reduction to compare.
- 3Review the comparison with a professional if needed. The tool does not promise a specific amount or date of weight loss.
Words to know
- Calories / kcal
- Food energy. A food-label Calorie means one kilocalorie (kcal).
- Macros
- Carbohydrate, protein, and fat: three nutrients that provide energy.
- Serving
- The amount used on a food label. It is not a recommendation for how much to eat.
Diet & Nutrition Tools
Plan portions, understand food labels, and compare your own nutrition numbers. No account or food upload needed.
Sources & methods
References checked November 11, 2026. Read each tool’s scope and assumptions before relying on its result.