The Diet Macro Calculator allocates a daily calorie target among protein, carbohydrate, and fat. Users can set protein in grams and choose carbohydrate and fat percentages, making the calculator useful for checking whether a proposed eating plan is mathematically complete.
Protein and carbohydrate are calculated at 4 calories per gram and fat at 9 calories per gram. The tool flags allocations that exceed the calorie target. It does not determine clinical nutrition needs, food quality, fiber, micronutrients, or whether a calorie target is appropriate.
Use a target established from your overall plan.
Enter protein directly in grams.
Enter the percentage of daily calories assigned to carbohydrate.
Enter the percentage assigned to fat.
A negative value means the targets exceed available calories; a positive value can be reassigned.
Where:
Assumptions: The arithmetic uses standard energy conversion factors and does not adjust for fiber, sugar alcohols, alcohol, or rounding on food labels.
The result shows calories not yet assigned to the entered macro targets.
Nutrition needs vary; obtain individualized advice when medical conditions, pregnancy, eating disorders, or performance requirements apply.
Given:
Calculation:
Protein = 140 × 4 = 560 kcal. Carbohydrate = 2,200 × 0.45 = 990 kcal = 247.5 g. Fat = 2,200 × 0.30 = 660 kcal = 73.3 g. Unallocated = 2,200 − 560 − 990 − 660 = −10 kcal.
Result: Approximately 140 g protein, 248 g carbohydrate, and 73 g fat, with a 10 kcal over-allocation.
The small mismatch can be corrected by reducing one target or accepted as rounding.
Many diet plans set protein relative to body weight, so direct grams are often more practical.
Needs vary. U.S. dietary guidance commonly references broad acceptable distribution ranges, but individual goals and conditions may require different targets.
Protein is entered in grams while the other macros use percentages, and rounding can create small differences.
Food labels generally include fiber within total carbohydrate, but metabolizable energy can differ from the simple 4 kcal/g model.
No. It calculates macro quantities; it does not select foods or evaluate micronutrient adequacy.