Convert between macronutrient grams and calories, or split a calorie target into protein, carbs, and fat. This Nutrition Calculator is part of our free productivity tools collection on freetoolstouse. It runs entirely in your browser, so your files and inputs stay on your device unless the tool explicitly performs a network check (for example DNS or SSL lookups). There is no signup, no watermark, and no usage cap. Use it whenever you need a fast, accurate result without installing software.
Convert between macronutrient grams and calories, or split a calorie target into protein, carbs, and fat.
Standard energy values: protein 4 kcal/g, carbohydrates 4 kcal/g, fat 9 kcal/g. For personalized daily calorie needs, use the Calorie Calculator.
