How does the Macro Split Calculator work?

Protein: 4 calories per gram Then: Carbohydrates: 4 calories per gram Then: Fat: 9 calories per gram Then: Split varies: muscle gain (35P/40C/25F), fat loss (40P/30C/30F), endurance (20P/55C/25F).

Can you give an example of how to use the Macro Split Calculator?

Example: Input 2,000 kcal, muscle building goal gives a result of Protein 175g, Carbs 200g, Fat 56g.

Is the Macro Split Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Macro Split Calculator?

Our Macro Split Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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Macro Split Calculator

Daily Calories

Goal

A macro split calculator determines the optimal distribution of protein, carbohydrates, and fat in your diet based on total calories and fitness goal. Macronutrients provide different caloric densities and serve different physiological roles.

Symbol	Name	Unit	Description
cal	Daily calories	cal	Total daily energy intake
prot_g	Protein	g	Amino acid target (1.6–2.2 g/kg for athletes)
carb_g	Carbs	g	Energy source (3–7 g/kg depending on activity)
fat_g	Fat	g	Essential nutrients (0.5–1.5 g/kg)

Goal	Protein %	Carbs %	Fat %
Maintain weight	30%	40%	30%
Build muscle	35%	40%	25%
Fat loss	40%	30%	30%
Endurance sport	20%	55%	25%
Keto diet	20%	5%	75%

References

›Macronutrient guidelines — Academy of Nutrition
›Dietary Reference Intakes — USDA

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