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Food Portion Calorie Calculator

Scale calories and macros from a food label to the portion you actually weighed.

Tool inputs stay in your browser · optional AI search sends your query

Good to know: Each label value × (portion weight ÷ label serving weight). Label rounding is retained; no food database lookup is performed. 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)

  1. 1Copy the serving weight, calories, and macros from the food label.
  2. 2Weigh the portion you plan to eat in grams. Match raw or cooked preparation to the label.
  3. 3Read the scaled amounts. A label serving size is not advice about how much you should eat.

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.

Macro CalculatorCalorie Deficit CalculatorProtein Intake CalculatorNet Carb CalculatorRecipe Calorie CalculatorMeal Calorie Split CalculatorNutrition Daily Value CalculatorWeight Loss Percentage CalculatorWeekly Calorie Average CalculatorFiber Intake CalculatorSugar Grams to Teaspoons CalculatorCalorie Calculator (BMR & TDEE)Meal & Food Diary

Sources & methods

References checked November 11, 2026. Read each tool’s scope and assumptions before relying on its result.

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