Macronutrient Calculator
Once you know your daily calorie target from your TDEE Calculator, the next step is splitting those calories into the right amount of protein, carbohydrates, and fat. Enter your details below to get a complete daily macro breakdown.
Understanding Your Macronutrients
Protein
Protein (4 kcal/g) is essential for muscle repair, immune function, and satiety. Targets depend on goal:
- Fat loss: 1.0–1.2g per lb of body weight to preserve muscle
- Maintenance: 0.7–0.9g per lb
- Muscle gain: 0.8–1.0g per lb
Good protein sources include chicken, fish, eggs, Greek yogurt, legumes, and protein supplements.
Carbohydrates
Carbohydrates (4 kcal/g) are the body's preferred energy source, particularly for high-intensity exercise. Low-carb and keto approaches reduce carbs significantly to shift the body toward fat-burning (ketosis). For most active people, moderate carb intake supports better performance and recovery.
Fat
Dietary fat (9 kcal/g) is critical for hormone production (including testosterone and estrogen), fat-soluble vitamin absorption (A, D, E, K), and brain health. Even on keto and low-fat diets, a minimum of 0.35g/lb is recommended to maintain hormonal health.
Which Diet Ratio Is Right for You?
| Approach | Best for | Protein | Carbs | Fat |
|---|---|---|---|---|
| Balanced | General health, beginners | 30% | 40% | 30% |
| Low Carb | Metabolic health, steady energy | 35% | 25% | 40% |
| Keto | Insulin resistance, epilepsy management | 30% | 5% | 65% |
| High Protein | Muscle building, fat loss | 40% | 35% | 25% |
| Low Fat | Cardiovascular health | 25% | 55% | 20% |
These ratios are starting points. Track your intake for 2–3 weeks using an app, then adjust based on energy, hunger, and progress.
Frequently Asked Questions
How accurate is this calculator? The calorie base uses the Mifflin-St Jeor BMR equation — the most validated formula for most adults. Actual needs vary by ±10–15%. Treat the output as a starting point and adjust by 100–150 calories per week based on real-world results.
Do I need to hit my macros exactly? No. Aim to hit your protein target consistently (it's hardest to meet and most important for body composition), keep fat above the minimum, and let carbs fill the remaining calories. Within ±10% on all macros on most days is excellent.
What about fiber? Fiber is a type of carbohydrate that is not digested for energy. Most guidelines recommend 25–38g of fiber per day. It is already included in your carbohydrate total — aim for at least 25% of your carb grams to come from high-fiber foods (vegetables, legumes, whole grains, fruit).
