Macro Calculator
The Macro Calculator estimates daily calorie, protein, carb, and fat targets based on your body metrics and goal.
Macro Calculator
What the result means
Macros are the three main nutrient groups: protein, carbohydrates, and fat. The calculator estimates daily targets based on your calorie goal.
How to use this calculator
- 1Enter your details.
- 2Select your activity level.
- 3Choose your goal.
- 4Press Calculate.
The formula
The calculation uses a standard, verifiable formula. Here it is in its simplest form.
What each variable means
| Symbol | Name | Description |
|---|---|---|
| W | Weight | Body weight in kg. |
| TDEE | TDEE | Total Daily Energy Expenditure. |
Step-by-step example
Example: 70kg, moderate activity, maintain
- 1TDEE ≈ 2,556 calories
- 2Protein = 70 × 1.8 = 126g
- 3Fat = 25% of 2556 / 9 = 71g
- 4Carbs = (2556 - 504 - 639) / 4 = 353g
Result
≈ 126g protein, 71g fat, 353g carbs
What changes the result
- Activity level determines calories.
- Goal adjusts the calorie target.
Edge cases to be aware of
Unusual situations handled correctly
- Estimates vary by individual.
Common mistakes
Avoid these errors
- Forgetting to adjust macros for goals.
Assumptions
- Standard nutrient partitioning.
Limitations
- This is an estimate, not personalized nutrition advice.
Key terms to know
Macronutrient+
Protein+
Carbohydrates+
Fat+
Calorie target+
Nutrient partitioning+
TDEE+
Real-world scenarios
Weight-loss macro adjustment
A person lowers their calorie target by 500 calories for gradual weight loss.
What it means: The calculator keeps protein relatively high to help preserve muscle during a deficit, then fills the remainder with carbs and fat. The exact split works for many people but is not a perfect prescription for everyone.
Muscle-gain approach
A person adds 300 calories above maintenance and keeps protein at 1.8g per kg of body weight.
What it means: The surplus provides energy for training, while the higher protein supports muscle repair. Same as weight loss, the ideal surplus and protein level vary by individual and training intensity.
Changing protein needs
Two people of the same weight have different activity levels.
What it means: The calculator uses a fixed protein-per-kg multiplier. A highly active person or serious athlete may benefit from a higher protein ratio than the default, so it is a solid starting point rather than a rule.
Macro targets vs calorie targets
A user tracks grams and a different user tracks only calories.
What it means: Macro targets break a calorie goal into total food groups; calorie-only tracking is simpler but may not cover protein needs. Choosing the method that fits your lifestyle is the most sustainable approach.
Related concepts
Basal metabolic rate
Your BMR sets the resting foundation for your calorie target before macro splits are applied.
Daily calorie needs
Macros build on your estimated total calorie needs, so understanding TDEE helps you interpret the grams.
Body composition
Lean mass affects calorie needs and protein requirements. A body-fat estimate gives context for how your macro targets relate to muscle.
Ideal weight range
Your reference range from an ideal-weight tool can help you choose which macro goal to focus on first.