Protein is the most important macronutrient for muscle preservation, satiety, and recovery. But how much do you actually need? The answer depends on your weight, activity level, and goal.
In this article, you'll learn how to calculate your individual protein needs — and which foods are the best sources.
Why Protein Matters
Protein provides amino acids your body needs to build and maintain muscles, enzymes, and hormones. Without enough protein, you lose muscle mass instead of fat during a diet — and recover more slowly from exercise.
Protein also has the highest thermic effect of all macronutrients: your body uses 20–30% of protein calories for digestion alone. Carbohydrates use only 5–10%, and fat just 0–3%.
How Much Protein Do You Need?
The RDA recommends 0.8 g/kg body weight — this is the minimum to prevent deficiency. For active people, muscle building, or dieting, the optimal range is significantly higher.
| Goal | Recommendation |
|---|---|
| Maintain weight (sedentary) | 0.8 – 1.0 g/kg |
| Maintain weight (active) | 1.2 – 1.4 g/kg |
| Lose fat | 1.2 – 1.6 g/kg |
| Build muscle | 1.6 – 2.2 g/kg |
Protein by Goal
Build Muscle
For maximum muscle growth, research recommends 1.6–2.2 g/kg body weight. More than 2.2 g/kg provides no additional benefit. Distribute protein evenly across 3–5 meals with 20–40 g each.
Lose Fat
In a calorie deficit, higher protein intake (1.2–1.6 g/kg) protects muscle mass. Protein is also more satiating than carbs or fat — you'll feel less hungry.
Maintain Weight
Even without a specific fitness goal, adequate protein strengthens your immune system, supports bone health, and improves metabolism.
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Calculate for free now →Protein Sources Compared
Animal sources like chicken breast (31 g/100 g), tuna (26 g), and eggs (13 g) have high biological value. Plant-based alternatives like lentils (9 g), tofu (8 g), and seitan (25 g) are also good sources — vegans should combine different sources for a complete amino acid profile.
Combine your protein needs with the right macronutrients and enough water for optimal results.
Vegetarian and Vegan
Plant-based proteins have lower bioavailability than animal proteins. Vegetarians and vegans should increase their protein intake by 10–20% and combine different sources. Legumes plus grains (e.g., rice and beans) complement each other for a complete amino acid profile.
Conclusion
Your protein needs depend on weight, activity, and goal. Use our Protein Calculator for a personalized recommendation. Also calculate your TDEE and macronutrients for the full picture.
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