Macro Calculator

IIFYM — If It Fits Your Macros. Whether you follow flexible dieting or just want to optimize your nutrition, this macro calculator gives you personalized protein, carbohydrate, and fat targets based on your calorie goal and fitness objectives.

How to Use This Calculator

1. Enter your daily calorie target (use our Calorie Calculator to find this).
2. Select your goal: weight loss, maintenance, muscle gain, or custom.
3. Enter your body weight (for protein calculation).
4. Click Calculate to see grams of protein, carbohydrates, and fat per day.

Macro Recommendations by Goal

Weight loss (fat loss): Protein 30–35% | Fat 25–35% | Carbs 30–40%

Maintenance: Protein 20–30% | Fat 25–35% | Carbs 40–55%

Muscle gain (bulking): Protein 25–35% | Fat 20–30% | Carbs 40–55%

Caloric values: Protein 4 cal/g | Carbohydrates 4 cal/g | Fat 9 cal/g

Example Calculation

Goal: Weight loss | Daily calories: 1,800 | Body weight: 170 lbs

• Protein (30% = 540 cal): 540 ÷ 4 = 135g protein/day
• Fat (30% = 540 cal): 540 ÷ 9 = 60g fat/day
• Carbs (40% = 720 cal): 720 ÷ 4 = 180g carbs/day

Protein Priority

Protein is the most important macro to get right. Evidence-backed targets:

• Sedentary adult: 0.36g per pound of body weight (0.8g/kg)
• Active/recreational exerciser: 0.5–0.7g/lb (1.1–1.5g/kg)
• Strength athlete or muscle building: 0.7–1.0g/lb (1.5–2.2g/kg)
• During caloric deficit (weight loss): Higher protein (0.8–1g/lb) preserves muscle

Common Mistakes to Avoid

• Hitting calorie target while ignoring protein — Protein is the macro most people chronically under-consume. Prioritize protein, then fill remaining calories with carbs and fat.
• Fearing carbs or fat — Both are essential macronutrients. Extreme restriction of either leads to nutrient deficiencies and is unsustainable.
• Not adjusting macros as weight changes — As body weight changes, recalculate protein targets (based on current weight) and total calories (based on new TDEE).

Frequently Asked Questions

What is flexible dieting (IIFYM)?

If It Fits Your Macros is an approach where any food is acceptable as long as it fits within your daily macro targets. It avoids the psychological restriction of "forbidden foods" while maintaining nutritional structure.

Do macros matter more than calories?

Total calories determine weight change (energy balance). Macros determine body composition — what type of weight you gain or lose. Both matter: calories for the scale, macros for body composition quality.

Should I eat the same macros every day?

Most people benefit from consistent targets. Some athletes use carb cycling — higher carbs on training days, lower on rest days — but this adds complexity without significant benefit for most recreational exercisers.

Conclusion

Macros are the building blocks of your diet. Get your protein right first, then distribute remaining calories between carbs and fat based on your preferences and performance needs. Use this calculator to set your targets and track consistently.

Related: Calorie Calculator | Protein Calculator | Carbohydrate Calculator | TDEE Calculator