The RDA minimum is 0.8 g per kg of body weight, but this is the bare minimum to prevent deficiency. Active individuals typically need 1.2–2.2 g/kg depending on their goals. People building muscle or losing weight benefit from the higher end of this range to support muscle protein synthesis and preserve lean mass.
Protein Intake Calculator – How Much Protein Do You Need?
Calculate your daily protein needs based on your weight, activity level, and fitness goals. Get personalized protein recommendations for weight loss, muscle gain, or maintenance.
Activity Level
Goal
How much protein do you actually need?
The official Recommended Dietary Allowance (RDA) is 0.8 g of protein per kg of body weight per day. But that number was set to prevent deficiency in sedentary adults — not to optimize health, performance, or body composition. Research consistently shows that active people, those losing weight, and anyone over 50 benefit from significantly more.
Protein needs by goal
Your ideal protein intake depends on what you're trying to achieve:
- Weight loss (calorie deficit): 1.2–1.6 g/kg. Higher protein preserves lean muscle mass while you lose fat, increases satiety, and boosts your metabolic rate through the thermic effect of food.
- Maintenance (general health): 0.8–1.2 g/kg. Enough to maintain muscle, support immune function, and keep you feeling full between meals.
- Muscle gain (calorie surplus): 1.6–2.2 g/kg. The higher end maximizes muscle protein synthesis, especially when combined with progressive resistance training.
- Athletes & high-intensity training: 1.4–2.0 g/kg. Endurance and strength athletes both need more protein to repair tissue and support recovery.
Why does activity level matter?
Exercise increases muscle protein breakdown and triggers repair processes that require amino acids. The more active you are, the more protein your muscles need to recover and grow. A sedentary person maintaining weight might do fine at 0.8 g/kg, but someone training 4–5 days per week should aim for at least 1.4 g/kg — even if they're not actively trying to build muscle.
The thermic effect of protein
Your body burns 20–30% of protein calories just digesting and processing it — compared to 5–10% for carbs and 0–3% for fat. This means 100 calories from protein effectively costs your body 20–30 calories to process. Over a full day with high protein intake, this adds up to a meaningful metabolic advantage, especially for weight loss.
How to distribute protein across meals
Research shows that spreading protein across 3–5 meals (25–40 g per meal) maximizes muscle protein synthesis better than front-loading or back-loading protein:
- Breakfast: Greek yogurt with nuts, eggs with toast, or a protein smoothie (25–35 g).
- Lunch: Chicken breast, fish, or lentil-based bowl (30–40 g).
- Dinner: Lean meat, tofu stir-fry, or salmon with vegetables (30–40 g).
- Snacks (optional): Cottage cheese, protein bar, or a handful of almonds (10–20 g).
Best protein sources
Focus on complete proteins that contain all essential amino acids:
- Animal sources: Chicken breast (31 g/100 g), eggs (13 g/2 eggs), Greek yogurt (10 g/100 g), salmon (25 g/100 g), lean beef (26 g/100 g), whey protein (25 g/scoop).
- Plant sources: Tofu (17 g/100 g), tempeh (19 g/100 g), lentils (9 g/100 g cooked), chickpeas (8.9 g/100 g cooked), quinoa (4.4 g/100 g cooked), edamame (11 g/100 g).
Plant proteins are often incomplete individually, but combining different sources throughout the day (e.g., rice + beans, hummus + pita) provides all essential amino acids.
Can you eat too much protein?
For healthy individuals, intakes up to 2.2 g/kg (1 g/lb) are well-studied and safe. Very high intakes (3+ g/kg) show no additional muscle-building benefit and may cause digestive discomfort. People with pre-existing kidney disease should consult a doctor, as high protein intake increases kidney workload. For everyone else, staying within 1.2–2.2 g/kg is the sweet spot.
Protein and aging
After age 50, the body becomes less efficient at using protein for muscle repair — a phenomenon called anabolic resistance. Older adults need 1.0–1.5 g/kg to maintain muscle mass and prevent sarcopenia (age-related muscle loss). Spreading protein evenly across meals and including leucine-rich sources (whey, eggs, chicken) is especially important.
How this calculator works
We use evidence-based protein ranges from sports nutrition research (ISSN, ACSM) and adjust within the range based on your activity level. The result shows your daily protein target, per-meal amount, protein as a percentage of calories, and an equivalent in chicken breast servings for easy reference.
Bottom line
Getting your protein right is one of the highest-impact nutritional changes you can make:
- Aim for 1.2–2.2 g/kg depending on your goal
- Spread intake across 3–5 meals for optimal muscle protein synthesis
- Prioritize complete protein sources (or combine plant sources)
- More active = more protein needed
Use this protein calculator as a starting point, then let AI Meal Planner build a full meal plan around your target.
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Frequently Asked Questions
Yes. Protein has the highest thermic effect of any macronutrient — your body burns about 20–30% of protein calories just digesting it. It also increases satiety, keeping you fuller for longer, and helps preserve lean muscle mass during a calorie deficit so you lose fat instead of muscle.
For healthy individuals, protein intakes up to 2.2 g/kg (1 g/lb) are well-studied and considered safe. Very high intakes above 3 g/kg show no additional muscle-building benefit. People with pre-existing kidney disease should consult a doctor before significantly increasing protein intake.
Complete protein sources include chicken breast, fish, eggs, Greek yogurt, lean beef, and whey protein. Plant-based options include tofu, tempeh, lentils, chickpeas, and quinoa. Combining different plant proteins throughout the day ensures you get all essential amino acids.
Research shows spreading protein across 3–5 meals (25–40 g per meal) maximizes muscle protein synthesis. Your body can use more than 40 g per meal for other functions, but the muscle-building response plateaus around that amount per sitting. Aim for roughly equal protein at each meal.