Macro Nutrient Calculator
Calculate your daily calorie and macronutrient needs
Understanding Your Macro Nutrients
Macronutrients (macros) are the nutrients your body needs in large amounts to function: Protein, Carbohydrates, and Fats. Each plays a vital role in your health and fitness journey.
1. Protein (4 Calories per gram)
Essential for muscle repair, immune function, and hormone production. If your goal is muscle gain or weight loss, keeping protein high helps preserve lean muscle mass.
2. Carbohydrates (4 Calories per gram)
The body's primary energy source. Carbs fuel your brain and your workouts. This calculator allocates remaining calories to carbs after meeting protein and fat requirements.
3. Fats (9 Calories per gram)
Necessary for brain health, vitamin absorption, and hormone regulation. Fats are more calorie-dense than protein or carbs.
How the Calculation Works
This tool uses the Mifflin-St Jeor Equation, widely considered the most accurate formula for calculating Basal Metabolic Rate (BMR). We then apply a Physical Activity Level (PAL) multiplier to find your Total Daily Energy Expenditure (TDEE).
- Weight Loss: We subtract 500 calories from your TDEE to create a deficit.
- Muscle Gain: We add 500 calories to your TDEE to provide a surplus for growth.
- Macro Split: We use a balanced ratio of 30% Protein, 30% Fat, and 40% Carbohydrates as a starting point.
Example Calculation
A 30-year-old male, weighing 80kg and 180cm tall, with a moderate activity level:
- BMR: ~1,785 calories
- TDEE: ~2,767 calories
- Goal (Maintenance): 2,767 calories
- Protein (30%): 208g
- Fats (30%): 92g
- Carbs (40%): 277g