IIFYM Calculator (If It Fits Your Macros)
Compute your custom daily carbohydrate, protein, and fat targets based on your goals and preferred macro ratio.
Input Parameters
Enter details for calculation.
Carbohydrates
Expert Tip
Flexible dieting allows you to eat any foods as long as they fit your daily macro goals. Focus on getting enough fiber and micronutrients too.
Calculation Methodology & Details
Formula
Carbohydrates and proteins contain 4 calories per gram. Fats contain 9 calories per gram.
Important Disclaimer
The calculations provided are for educational and general informational purposes only. They do not replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider.
How IIFYM Macro Split is Calculated
Follow these steps to use this calculator:
Enter Calorie Budget
Input your total daily energy allowance.
Choose Macro Split
Select standard, low-carb, or high-carb ratios.
Read Gram Targets
View targets for carbs, protein, and fats.
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ℹ️ About this Calculation
This dietary and nutrition calculator helps optimize energy intake, macronutrient distribution, and dietary planning based on clinical metabolic guidelines and evidence-based nutrition science.
Variable Glossary
Dietary & Body Metrics
Calorie targets, macro ratios, body weight, activity level, or nutrient quantities consumed.
Metabolic Factors
Basal energy expenditure formulas (Mifflin-St Jeor, Harris-Benedict) and recommended daily allowances (RDA).
How to Calculate Step-by-Step
Step 1
Enter your personal stats, body weight, and physical activity multiplier.
Step 2
Select your health objective (maintenance, weight loss deficit, or muscle gain surplus).
Step 3
Get your tailored daily energy targets, macronutrient split, and nutrition guidelines.