Macro Calculator

Calculate daily protein, carbs, and fat targets

About Macro Calculator

A macro calculator splits your total daily calorie target into grams of protein, carbohydrates, and fat based on your goal — maintenance, muscle gain, or fat loss. Matching macros to your goal, not just hitting a calorie number, affects body composition and performance.

Formula

Protein (g) × 4 + Carbs (g) × 4 + Fat (g) × 9 = Total Calories

How It Works

Enter your daily calorie target (or calculate it from your BMR and activity level first)
Choose a macro split based on your goal (e.g., higher protein for muscle gain or fat loss)
The calculator converts each macro percentage into grams, using 4 calories per gram for protein and carbs, and 9 calories per gram for fat
Results show a gram target for protein, carbs, and fat that adds up to your total calories

Tips

Protein needs are more stable across goals (roughly 0.7-1 g per pound of body weight); carbs and fat are usually adjusted more based on goal and preference
Fat provides more than double the calories per gram of protein or carbs, so small changes in fat grams have a bigger calorie impact
There's no single 'best' macro split — sustainable adherence to a reasonable split beats a theoretically perfect one you can't stick to

Frequently Asked Questions

How many calories are in a gram of protein, carbs, and fat?

Protein and carbohydrates each provide 4 calories per gram, while fat provides 9 calories per gram — this is why macro grams and total calories must be consistent with each other.

What macro split is best for muscle gain?

A common approach is roughly 30-40% protein, 35-45% carbs, and 20-30% fat, with total calories set slightly above maintenance, though exact splits vary by individual and training style.

What macro split is best for fat loss?

Higher protein (30-40%) helps preserve muscle during a calorie deficit, with carbs and fat split based on preference and training demands — the calorie deficit itself matters more for fat loss than the exact macro ratio.

Do I need to hit my macros exactly every day?

No — being consistently close (within 5-10 grams) over time matters far more than hitting an exact number on any single day.

Why do my macros need to add up to my total calories?

Since each macro contributes a fixed number of calories per gram, the calculator solves for gram amounts that multiply out to your target calorie total — if you change one macro's grams, another must change to keep total calories the same.