Protein Intake Calculator
Enter your details below — get your personalized daily protein target with full step-by-step working
🌱 Beginner (70kg)
💪 Muscle Builder (80kg)
🔥 Fat Loss (75kg)
🏅 Endurance Athlete
🧓 Senior (65kg)
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Your Daily Protein Target
Personalized protein recommendation
Daily Protein Target
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Science-Based Recommendation
Protein Summary
Protein Per Meal Distribution
Protein Range by Goal
Step-by-Step Calculation
Cross-Check with Major Guidelines
How to Hit Your Daily Target
Full Profile & Interpretation
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What Is Protein & Why Does Intake Matter?
The science of protein — what it does in the body, why quantity matters, and how to think about your needs
Fundamentals
Protein: The Body's Builder, Repairer, and Regulator
Protein is one of three macronutrients (alongside carbohydrates and fat) and is unique because it is the only macronutrient that contains nitrogen. Made of chains of amino acids, proteins are involved in virtually every biological process: building and repairing muscle tissue, producing enzymes and hormones, supporting the immune system, transporting oxygen in the blood (hemoglobin), and providing structural integrity to skin, hair, and nails.
When you eat protein, your digestive system breaks it down into its constituent amino acids. Your body then reassembles these amino acids into the specific proteins it needs. Of the 20 amino acids, 9 are essential — your body cannot make them, so they must come from food. The remaining 11 are non-essential (your body can synthesize them from other compounds).
🥩 Key fact: Protein provides 4 calories per gram — the same as carbohydrates. Unlike fat (9 cal/g), protein has a very high thermic effect of food (TEF) — your body burns 20–35% of protein calories just to digest and process it. This makes high-protein diets naturally helpful for fat loss.
The recommended dietary allowance (RDA) for protein is 0.8g per kg of body weight — but this is the minimum to prevent deficiency, not the optimal amount for body composition or performance. Active individuals, those trying to build muscle, and older adults consistently need significantly more.
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Muscle Synthesis
Dietary protein directly stimulates muscle protein synthesis (MPS). Each meal of 25–40g protein maximally activates MPS. More frequent dosing across the day is superior to one large dose.
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Fat Loss Aid
High protein intake (1.8–2.4g/kg) during a calorie deficit preserves lean muscle mass while fat is lost. Protein is also the most satiating macronutrient — it reduces hunger and total calorie intake naturally.
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Hormones & Enzymes
Insulin, glucagon, growth hormone, IGF-1, and digestive enzymes are all proteins. Amino acids, especially leucine, directly trigger the mTOR signaling pathway that switches on muscle protein synthesis.
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Sarcopenia Prevention
After age 30, muscle mass naturally declines 3–8% per decade (sarcopenia). Higher protein intake (1.2–1.6g/kg) combined with resistance training is the most effective intervention to slow this process and maintain strength with aging.
Protein Requirements by Goal — Complete Reference
Science-backed protein ranges for every fitness goal, body type, and population, based on current research
Research-Based Targets
How Much Protein Do You Actually Need?
| Goal / Population | g per kg body weight | g per lb body weight | Notes & Evidence |
|---|---|---|---|
| RDA Minimum | 0.8 g/kg | 0.36 g/lb | Absolute minimum to prevent deficiency; not optimal for most active people |
| Sedentary Adult | 0.8–1.0 g/kg | 0.36–0.45 g/lb | General health maintenance; desk worker, no structured exercise |
| General Fitness | 1.2–1.6 g/kg | 0.55–0.73 g/lb | 1–3 workouts/week; moderate activity; maintain body composition |
| Muscle Building | 1.6–2.2 g/kg | 0.73–1.0 g/lb | Optimal range per meta-analyses (Morton et al., 2018; Phillips & Van Loon); beyond 2.2g/kg adds no benefit |
| Fat Loss (Cutting) | 1.8–2.4 g/kg | 0.82–1.09 g/lb | Higher protein in deficit preserves lean mass; very high-protein diets (2.4–3.1g/kg) explored by Helms et al. |
| Endurance Athletes | 1.2–1.6 g/kg | 0.55–0.73 g/lb | IAAF & IOC recommendations; higher during high training volume periods |
| Strength/Power Athletes | 1.6–2.2 g/kg | 0.73–1.0 g/lb | Powerlifting, weightlifting, sprinting; leucine-rich sources preferred |
| Bodybuilding (Natural) | 2.0–2.4 g/kg | 0.91–1.09 g/lb | Higher end during competition prep/cutting; 1.6–2.0g/kg adequate in off-season |
| Older Adults (50+) | 1.2–1.6 g/kg | 0.55–0.73 g/lb | Anabolic resistance increases with age; higher leucine per meal (3–4g) recommended |
| Vegetarian/Vegan | +10–20% above above | — | Plant proteins have lower digestibility and DIAAS scores; compensate with variety and higher total intake |
| Pregnant Women | 1.0–1.2 g/kg | 0.45–0.55 g/lb | Third trimester: higher needs; 71g/day minimum per Institute of Medicine |
🔬 Research consensus (2024): The upper limit of benefit for muscle protein synthesis from total daily intake is approximately 2.2g/kg for most people. Beyond this, extra protein is oxidized for energy rather than stored as muscle. However, higher intakes (up to 3g/kg) are safe and may be useful during aggressive calorie restriction.
How This Calculator Works — The Method Explained
The science and formulas behind the protein intake calculation, step by step
Methodology
Evidence-Based Protein Calculation Method
This calculator uses a multi-factor approach that accounts for body weight, sex, age, activity level, and your specific fitness goal. Here's how each factor influences the calculation:
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1Select Base Multiplier by Goal
Each fitness goal is assigned an evidence-based protein multiplier range (g/kg). For muscle building: 1.6–2.2g/kg. For fat loss: 1.8–2.4g/kg. For maintenance: 1.2–1.6g/kg. The midpoint of the range is used as the primary recommendation.Muscle building → 1.9 g/kg (midpoint of 1.6–2.2) -
2Apply Activity Level Adjustment
Activity increases protein turnover, requiring more intake to repair and build tissue. Sedentary: ×1.0, Light: ×1.05, Moderate: ×1.1, Active: ×1.15, Very Active: ×1.2, Elite Athlete: ×1.25.Active (5–6x/week) → multiplier ×1.15 -
3Apply Age Adjustment
Adults over 50 experience anabolic resistance — muscles become less responsive to protein. This requires a modest increase of 5–10% in protein recommendations for older adults.Age 55+ → +8% adjustment for anabolic resistance -
4Multiply by Body Weight
The adjusted protein ratio (g/kg) is multiplied by your body weight in kilograms to get your daily protein gram target.75kg × 2.185 g/kg = 163.9g → 164g per day -
5Divide by Meals for Per-Meal Targets
Research shows distributing protein across 3–5 meals (each 25–40g) maximizes total daily muscle protein synthesis better than fewer, larger doses.164g ÷ 4 meals = 41g per meal
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Best Protein Food Sources — Complete Guide
Protein content per 100g for animal and plant sources, with digestibility and amino acid quality scores
Food Sources
Animal & Plant Proteins Ranked
🥩 Animal Proteins (Complete)
| Food (100g raw) | Protein | Notes |
|---|---|---|
| Chicken Breast | 31g | Lean; most popular muscle-building protein |
| Turkey Breast | 29g | Very lean; high in tryptophan |
| Tuna (canned) | 30g | High omega-3; very affordable |
| Salmon | 25g | Rich in omega-3; anti-inflammatory |
| Beef (lean) | 26g | High in creatine, zinc, B12 |
| Eggs | 13g | Perfect DIAAS of 1.13; best leucine ratio |
| Greek Yogurt | 9–10g | Casein-rich; ideal pre-sleep protein |
| Cottage Cheese | 11g | Slow-digesting casein; excellent overnight |
| Whey Protein | 80–90g | Fast-absorbing; highest leucine content |
| Casein Protein | 75–85g | Slow-release; ideal before sleep |
🌱 Plant Proteins (Most Incomplete)
| Food (100g) | Protein | Notes |
|---|---|---|
| Soy Protein | 90g | Complete; highest DIAAS of plant proteins |
| Tempeh | 19g | Complete; fermented soy; high in probiotics |
| Edamame | 11g | Complete protein; young soybeans |
| Tofu (firm) | 8g | Complete; versatile; calcium-fortified |
| Lentils (cooked) | 9g | Incomplete; pair with rice for complete EAAs |
| Chickpeas | 9g | Pair with tahini or whole grain |
| Quinoa (cooked) | 4g | Complete protein grain; all 9 EAAs |
| Hemp Seeds | 31g | Complete; high omega-3; excellent amino profile |
| Seitan | 25g | Wheat gluten; very high protein; not for celiacs |
| Pea Protein | 80g | Nearly complete; popular vegan supplement |
🌱 Vegan/vegetarian tip: Combine legumes + grains (rice + beans, lentil soup + pita, hummus + whole wheat) to get all 9 essential amino acids at every meal. You don't need to combine them in a single meal — as long as you consume a variety throughout the day, your body pools amino acids effectively.
Protein Timing — When to Eat Protein for Best Results
The science of protein distribution across the day, post-workout intake, and pre-sleep protein
Nutrient Timing
Maximize Muscle Protein Synthesis with Smart Timing
While total daily protein intake is the most important factor, research shows that how you distribute protein across the day can make a meaningful difference — especially for muscle building. The key concept is that each meal has a maximum muscle protein synthesis (MPS) response, which is saturated at approximately 25–40g of high-quality protein per meal.
Consuming 160g of protein in two meals (80g each) is significantly less effective than consuming the same 160g across 4–5 meals of 32–40g each. This is because excess amino acids from a very large single dose are simply oxidized (burned for energy), while spreading the dose across the day keeps MPS elevated for longer.
⏰ Protein Timing Rules
🌅Breakfast: 30–40g protein within 1–2 hours of waking — breaks overnight fast, stimulates MPS
🏋️Pre-workout: 20–40g, 1–2 hours before training (optional if recent meal)
💪Post-workout: 25–40g within 2 hours — most important for recovery, though window is wider than once thought
🌙Pre-sleep: 30–40g casein (cottage cheese, Greek yogurt) — stimulates overnight MPS by 22% (Res et al.)
⏱️Distribution: Space meals 3–5 hours apart for full MPS stimulation from each feeding
🔬 Key Research Findings
📊Leucine threshold: ~2–3g leucine per meal is required to "trigger" MPS (important for plant-based eaters)
🔄Anabolic window: Post-workout window is 0–2 hours, not 30 min as once believed (Aragon & Schoenfeld)
🌙Pre-sleep protein: 40g casein before bed increases overnight MPS by ~22% and whole-body protein balance
⚡Whey vs casein: Whey is fast-digesting (post-workout), casein is slow (overnight); blend is effective for both
Complete vs Incomplete Proteins & Amino Acid Profiles
Essential amino acids, DIAAS quality scores, and how to get complete protein from plant-based diets
Amino Acid Science
Not All Protein Is Created Equal
The quality of a protein source is determined by its amino acid profile — specifically whether it contains all 9 essential amino acids (EAAs) in adequate quantities. The modern standard for protein quality is the DIAAS score (Digestible Indispensable Amino Acid Score), which replaced the older PDCAAS.
| Essential Amino Acid | Role | Best Sources |
|---|---|---|
| Leucine | Primary trigger of muscle protein synthesis (mTOR activation). The most important EAA for muscle building. | Whey, eggs, beef, chicken, soy |
| Isoleucine | Energy regulation, immune function, hemoglobin synthesis. Works with leucine in BCAAs. | Eggs, chicken, fish, hemp seeds |
| Valine | Muscle metabolism, nitrogen balance, cognitive function. Third BCAA alongside leucine and isoleucine. | Beef, chicken, peanuts, mushrooms |
| Lysine | Collagen synthesis, calcium absorption, immune function. Often the limiting amino acid in grains. | Meat, fish, dairy, legumes |
| Methionine | Initiates protein synthesis; precursor to SAM-e and glutathione (master antioxidant). Limiting in legumes. | Beef, poultry, fish, Brazil nuts |
| Phenylalanine | Precursor to tyrosine, dopamine, epinephrine, and norepinephrine. Pain and mood regulation. | Meat, fish, dairy, soybeans |
| Threonine | Structural component of proteins; important for immune function and fat metabolism. | Poultry, fish, dairy, lentils |
| Tryptophan | Precursor to serotonin and melatonin. Mood, sleep, and appetite regulation. | Turkey, eggs, pumpkin seeds, tofu |
| Histidine | Growth, repair, and maintenance of myelin sheaths; precursor to histamine (immune). | Meat, poultry, fish, dairy |
🏆 DIAAS quality scores: Whole egg = 1.13 (best). Whey = 1.09. Beef = 1.0. Soy = 0.91. Pea = 0.82. Rice = 0.59. Wheat = 0.43. Higher is better. Vegan athletes should aim for the higher end of protein intake ranges to compensate for lower digestibility and amino acid completeness.
Protein Intake FAQs
Answers to the most frequently asked questions about daily protein needs, timing, sources, and safety
How much protein do I need per day?
It depends on your body weight, activity level, and goals. The absolute minimum RDA is 0.8g per kg of body weight to prevent deficiency. For active people: 1.2–1.6g/kg. For muscle building: 1.6–2.2g/kg. For fat loss: 1.8–2.4g/kg. A moderately active 70kg person building muscle needs approximately 112–154g per day. Use this calculator above to get your personalized number.
How much protein do I need to build muscle?
To maximize muscle hypertrophy, research (particularly Morton et al.'s 2018 meta-analysis of 49 studies) recommends 1.6–2.2g of protein per kg of body weight per day. For a 75kg person, that is 120–165g of protein daily. Beyond 2.2g/kg, additional protein does not produce additional muscle gain. Timing matters too: distribute protein across 3–5 meals of 25–40g each to maximize muscle protein synthesis responses throughout the day.
Is too much protein harmful to kidneys?
In healthy individuals with no pre-existing kidney disease, there is no credible evidence that high protein intake (up to 2.2–3g/kg/day) causes kidney damage. Studies including Martin et al. (2005) and Antonio et al. (2015) found no adverse kidney markers from high-protein diets in healthy people.
However, people with existing chronic kidney disease (CKD) should restrict protein and consult a nephrologist, as protein metabolism produces urea and other waste products that stressed kidneys may struggle to filter. If you have any kidney condition, always get medical advice before increasing protein significantly.
However, people with existing chronic kidney disease (CKD) should restrict protein and consult a nephrologist, as protein metabolism produces urea and other waste products that stressed kidneys may struggle to filter. If you have any kidney condition, always get medical advice before increasing protein significantly.
Can I eat all my protein in one meal?
Technically yes — your body will digest and use it — but it is less effective for muscle building than spreading protein across multiple meals. Research shows that each meal stimulates muscle protein synthesis (MPS), but MPS saturates at approximately 25–40g of high-quality protein per meal. Excess amino acids beyond this threshold are oxidized for energy rather than directed to muscle building.
If you eat 160g protein in 2 meals (80g each), the excess from each huge dose is largely wasted for muscle-building purposes. Spreading it across 4 meals of 40g each produces a substantially greater total MPS response across the day.
If you eat 160g protein in 2 meals (80g each), the excess from each huge dose is largely wasted for muscle-building purposes. Spreading it across 4 meals of 40g each produces a substantially greater total MPS response across the day.
What foods are highest in protein?
The highest-protein foods per 100g of raw weight:
Animal sources: Chicken breast (31g), tuna (30g), turkey breast (29g), beef steak (26g), salmon (25g), eggs (13g), cottage cheese (11g), Greek yogurt (10g).
Plant sources: Hemp seeds (31g), seitan (25g), tempeh (19g), edamame (11g), lentils cooked (9g), chickpeas (9g), tofu (8g), quinoa cooked (4g).
Supplements (pure protein): Whey protein powder (80–90g per 100g), casein (75–85g), soy protein isolate (90g), pea protein (80g).
Animal sources: Chicken breast (31g), tuna (30g), turkey breast (29g), beef steak (26g), salmon (25g), eggs (13g), cottage cheese (11g), Greek yogurt (10g).
Plant sources: Hemp seeds (31g), seitan (25g), tempeh (19g), edamame (11g), lentils cooked (9g), chickpeas (9g), tofu (8g), quinoa cooked (4g).
Supplements (pure protein): Whey protein powder (80–90g per 100g), casein (75–85g), soy protein isolate (90g), pea protein (80g).
When should I eat protein for best muscle growth?
The most important factor is total daily protein intake. However, for optimal results:
• Post-workout: Consume 25–40g of protein within 2 hours of training to support recovery and MPS. Whey protein (fast-digesting) is ideal here.
• Pre-sleep: 30–40g of slow-digesting casein protein (cottage cheese, Greek yogurt, casein powder) before bed has been shown to increase overnight MPS by ~22%.
• Spacing: Allow 3–5 hours between protein meals for full MPS stimulation from each feeding.
• Morning: A protein-rich breakfast (30g+) helps maintain positive nitrogen balance after the overnight fast.
• Post-workout: Consume 25–40g of protein within 2 hours of training to support recovery and MPS. Whey protein (fast-digesting) is ideal here.
• Pre-sleep: 30–40g of slow-digesting casein protein (cottage cheese, Greek yogurt, casein powder) before bed has been shown to increase overnight MPS by ~22%.
• Spacing: Allow 3–5 hours between protein meals for full MPS stimulation from each feeding.
• Morning: A protein-rich breakfast (30g+) helps maintain positive nitrogen balance after the overnight fast.
What is the difference between complete and incomplete protein?
A complete protein contains all 9 essential amino acids (EAAs) in sufficient quantities. All animal foods (meat, fish, eggs, dairy) are complete proteins. Complete plant proteins include soy, quinoa, hemp seeds, and buckwheat.
An incomplete protein is low in one or more EAAs. Most plant foods are incomplete — legumes are low in methionine, grains are low in lysine. However, by eating a variety of plant proteins throughout the day (not necessarily in the same meal), you can get all EAAs. Classic combinations: rice + beans, lentils + bread, hummus + pita.
An incomplete protein is low in one or more EAAs. Most plant foods are incomplete — legumes are low in methionine, grains are low in lysine. However, by eating a variety of plant proteins throughout the day (not necessarily in the same meal), you can get all EAAs. Classic combinations: rice + beans, lentils + bread, hummus + pita.
Does protein make you fat?
No — protein is the least likely macronutrient to be stored as fat. Here is why:
1. High TEF: 20–35% of protein calories are burned during digestion (vs 5–10% for carbs, 0–3% for fat).
2. High satiety: Protein is the most filling macronutrient, naturally reducing total calorie intake.
3. Muscle building: Excess protein is more likely to be used for muscle repair and growth, or oxidized, than converted to fat.
4. Evidence: High-protein diets consistently outperform low-protein diets for fat loss even at the same calorie intake (Layman et al., 2003).
You can only gain fat by consuming more total calories than you expend — excess protein contributes to this only if it pushes you into a calorie surplus.
1. High TEF: 20–35% of protein calories are burned during digestion (vs 5–10% for carbs, 0–3% for fat).
2. High satiety: Protein is the most filling macronutrient, naturally reducing total calorie intake.
3. Muscle building: Excess protein is more likely to be used for muscle repair and growth, or oxidized, than converted to fat.
4. Evidence: High-protein diets consistently outperform low-protein diets for fat loss even at the same calorie intake (Layman et al., 2003).
You can only gain fat by consuming more total calories than you expend — excess protein contributes to this only if it pushes you into a calorie surplus.