What are Macronutrients (Macros)?
Macronutrients are the three main suppliers of nutrients in your diet: Protein, Carbohydrates, and Fats. Every single food you eat is made up of a combination of these three macros, and each provides a specific amount of energy (calories) to your body.
- Protein: 4 calories per gram. Essential for building and repairing muscle tissue.
- Carbohydrates: 4 calories per gram. The body's preferred and most efficient source of energy, especially for brain function and high-intensity exercise.
- Fats: 9 calories per gram. Crucial for hormone production, nutrient absorption, and long-lasting energy.
Why Should You Count Macros Instead of Just Calories?
If you only track calories, you can absolutely lose weight. However, "weight loss" is not the same as "fat loss". If you eat 1,500 calories of pure carbohydrates and no protein, you will lose weight, but a significant portion of that weight will be your own muscle tissue.
Tracking macros ensures that your body composition improves. By hitting a precise protein target, you ensure muscle retention during a deficit. By managing your fats, you keep your testosterone and estrogen levels healthy. By utilizing carbs efficiently, you fuel your workouts.
Our Algorithm Explained
This calculator first establishes your Total Daily Energy Expenditure (TDEE) using the Mifflin-St Jeor equation. Once your TDEE is found, we apply a modifier based on your goal:
- Maintenance: 0% adjustment.
- Fat Loss: -20% deficit. This aggressive but safe deficit is optimized to burn fat while preserving muscle.
- Muscle Gain (Bulk): +10% surplus. A lean bulk surplus to promote muscle hypertrophy with minimal fat spillover.
Finally, we partition those calories. For fat loss, protein is kept high (around 40% of intake) to protect muscle, while carbs and fats are balanced. For bulking, carbs are increased to fuel heavy training.