Calculate your optimal daily protein, carbohydrates, and fat intake based on your weight, goals, and activity level.
Macronutrients — protein, carbohydrates, and fats — are the three nutrient categories that provide calories (energy) to your body. Each plays distinct roles, and the ratio between them can be adjusted based on your goals, whether that's weight loss, muscle building, athletic performance, or general health maintenance.
Protein (4 calories per gram): Essential for muscle repair and growth, immune function, hormone production, and satiety. During weight loss, higher protein intake helps preserve lean muscle mass. Common recommendations range from 0.8g per kg of body weight (general health) up to 1.6-2.2g per kg for those engaged in regular resistance training.
Carbohydrates (4 calories per gram): The body's preferred and most readily available energy source, particularly important for high-intensity exercise and brain function. Carbohydrate needs vary widely based on activity level — endurance athletes may need significantly more than sedentary individuals.
Fat (9 calories per gram): Essential for hormone production, vitamin absorption (vitamins A, D, E, and K are fat-soluble), and cell membrane structure. Fat should generally make up at least 20% of total calories to support these essential functions.
The calculation begins with an estimate of your Total Daily Energy Expenditure (TDEE) based on the Mifflin-St Jeor equation — one of the most validated formulas for estimating basal metabolic rate — adjusted by an activity multiplier. From this total calorie figure, macronutrient targets are distributed based on the goal you select (such as fat loss, maintenance, or muscle gain), using ratios commonly recommended in sports nutrition literature.
For fat loss, higher protein helps preserve muscle during a calorie deficit while improving satiety. For muscle gain, both adequate protein and sufficient total calories (often a slight surplus) support growth. For endurance performance, higher carbohydrate intake supports glycogen replenishment for training and competition. There's no single "correct" ratio — what matters most is finding a sustainable approach that meets your protein needs and overall calorie target.
This calculator provides an estimate based on population averages and formulas. Individual metabolism can vary by 10-15% or more from these estimates due to genetics, muscle mass, hormonal factors, and other variables. Use the numbers as a starting point, then adjust based on real-world results over 2-3 weeks of consistent tracking.
Do I need to hit my macros exactly every day? No — weekly averages matter more than daily precision. Small day-to-day variation is normal and not a cause for concern.
Is a high-protein diet safe for kidney health? For people with healthy kidney function, research has not shown that higher protein intakes within commonly recommended ranges cause kidney damage. However, those with existing kidney disease should follow guidance from their healthcare provider regarding protein intake.
What if I'm vegetarian or vegan — can I still hit these targets? Yes, though it may require more deliberate planning, particularly for protein. Combining sources like legumes, tofu, tempeh, seitan, and protein-rich grains like quinoa can help meet protein targets on a plant-based diet.