Macro Calculator
Enter your weight, select your goal and activity level. You get a calculation of daily calories and macronutrients.
Daily calories
Protein
Carbohydrates
Fat
Macro Calculator — Daily Calories and Macronutrient Targets
The macro calculator estimates your daily calorie needs and breaks them down into the three macronutrients — protein, carbohydrates, and fat — based on your weight, activity level, and fitness goal. Whether you want to lose fat, build muscle, or maintain your current weight, tracking macros gives you far more control than counting calories alone.
What Are Macronutrients?
Macronutrients ("macros") are the three types of nutrients that provide energy:
- Protein — 4 kcal per gram. Essential for muscle repair, immune function, and enzyme production. Found in meat, fish, eggs, dairy, legumes, and tofu.
- Carbohydrates — 4 kcal per gram. The body's and brain's preferred fuel source. Found in grains, fruits, vegetables, and sugars.
- Fat — 9 kcal per gram. Needed for hormone production, vitamin absorption (A, D, E, K), and cell membrane integrity. Found in oils, nuts, avocados, and fatty fish.
How the Calculator Works
- Estimate BMR — The calculator uses your weight, height, age, and gender to estimate Basal Metabolic Rate.
- Apply activity factor — BMR is multiplied by an activity multiplier to get Total Daily Energy Expenditure (TDEE).
- Adjust for goal — Calories are added or subtracted based on your objective.
- Split macros — Calories are divided into protein, carbs, and fat according to evidence-based ratios.
Calorie Adjustments by Goal
| Goal | Calorie Adjustment | Protein Target | Fat Target | Carbs |
|---|---|---|---|---|
| Lose weight | TDEE − 15–20% | 1.0 g/lb (2.2 g/kg) | 0.35 g/lb | Remaining calories |
| Maintain weight | TDEE | 0.8 g/lb (1.6 g/kg) | 0.35 g/lb | Remaining calories |
| Build muscle | TDEE + 10–15% | 0.9 g/lb (2.0 g/kg) | 0.35 g/lb | Remaining calories |
Sample Macro Plan — 2,200 Calorie Day
| Macro | Grams | Calories | % of Total |
|---|---|---|---|
| Protein | 165 g | 660 kcal | 30% |
| Carbohydrates | 248 g | 990 kcal | 45% |
| Fat | 61 g | 550 kcal | 25% |
| Total | 2,200 kcal | 100% |
Activity Level Definitions
- Sedentary — Desk job, minimal walking (factor 1.2)
- Lightly active — Exercise 1–3 days per week or active commute (factor 1.375)
- Moderately active — Exercise 3–5 days per week (factor 1.55)
- Very active — Hard exercise 6–7 days per week (factor 1.725)
- Extremely active — Physical labor job + daily intense training (factor 1.9)
High-Protein Food Sources
| Food | Serving | Protein | Calories |
|---|---|---|---|
| Chicken breast | 6 oz (170 g) | 42 g | 187 kcal |
| Salmon | 6 oz (170 g) | 34 g | 280 kcal |
| Greek yogurt (nonfat) | 1 cup | 17 g | 100 kcal |
| Eggs | 2 large | 12 g | 140 kcal |
| Tofu (firm) | 1/2 block | 20 g | 180 kcal |
| Lentils (cooked) | 1 cup | 18 g | 230 kcal |
| Whey protein | 1 scoop | 25 g | 120 kcal |
Common Macro Mistakes
- Not eating enough protein — Most people undereat protein, especially when cutting calories. Aim for at least 0.7 g per pound of body weight.
- Fearing fat — Dietary fat is essential for hormones and satiety. Going below 20% of calories from fat can disrupt hormone function.
- Ignoring fiber — While technically a carbohydrate, fiber does not significantly contribute to calories and is crucial for digestive health. Aim for 25–35 g per day.
- Obsessing over precision — Hitting your targets within ±10% is perfectly fine. Consistency over weeks matters more than daily perfection.
Frequently Asked Questions
What is the best macro ratio for weight loss?
A common evidence-based split is 40% protein, 35% carbs, 25% fat during a calorie deficit. High protein preserves muscle mass while you lose fat.
Do I need to track macros forever?
No. Most people track for 2–3 months to build awareness of portion sizes and food composition. After that, intuitive eating with occasional check-ins is usually sufficient.
Can I build muscle in a calorie deficit?
Yes, but only under specific conditions: if you are a beginner, returning after a layoff, or significantly overweight. For experienced lifters, a slight calorie surplus is needed for optimal muscle growth.
How do I track my macros?
Use a food tracking app like MyFitnessPal, Cronometer, or MacroFactor. Weigh food with a kitchen scale for the most accuracy.
Related Tools
- Daily Calorie Needs Calculator — Get your TDEE estimate
- BMR Calculator — Find your basal metabolic rate
- Calorie Burn Calculator — Estimate exercise calorie expenditure
- BMI Calculator — Check your body mass index
- Portion Calculator — Scale recipes to your macro targets
Sources
- CDC: Nutrition
- ISSN Position Stand: Protein and Exercise
- Dietary Guidelines for Americans: 2020–2025