Protein Calculator

Find out exactly how much protein you need each day based on your body weight and goal. Get minimum, optimal, and maximum gram targets plus a per-meal breakdown and high-protein food reference.

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Why Protein Is the Most Important Macronutrient

Of the three macronutrients — protein, carbohydrates, and fat — protein is the only one your body cannot store for later use in a meaningful way. Excess carbohydrates become glycogen or fat. Excess dietary fat is stored as body fat. Excess protein is oxidised for energy.

This matters because your muscles, organs, enzymes, hormones, and immune system are built from protein. Adequate daily protein is not optional — it is the foundation of body composition, recovery, and long-term health.

How Protein Builds Muscle: Muscle Protein Synthesis

Every time you eat a meal containing protein, you trigger a process called muscle protein synthesis (MPS) — the creation of new muscle proteins. MPS peaks roughly 90–120 minutes after a protein-rich meal and returns to baseline within 3–5 hours.

To maximise total daily MPS, research consistently shows that spreading protein across 3–5 meals (rather than eating it all at once) stimulates more total synthesis. Each meal should contain roughly 25–40 g of high-quality protein to maximally stimulate MPS in most adults.

Protein for Fat Loss: Why More Is Better

During a calorie deficit, your body faces a problem: it needs energy from somewhere, and muscle tissue is a convenient target. High protein intake (1.8–2.2 g/kg) solves this by:

Stimulating MPS — keeping the muscle-building signal active even in a deficit
Increasing satiety — protein is the most satiating macronutrient, reducing hunger on fewer calories
Boosting the thermic effect of food (TEF) — protein requires 20–30% of its calories to digest, vs 5–10% for carbs and 0–3% for fat

Studies directly comparing protein intakes during fat loss consistently show that higher protein groups preserve more lean mass and lose more fat mass, even with identical calorie deficits.

Protein Quality and Leucine

Not all protein is equal. The amino acid leucine is the primary trigger for MPS — it acts like a key turning on the anabolic process. Animal proteins (chicken, beef, fish, eggs, dairy) are rich in leucine. Most plant proteins contain lower leucine per gram.

This is why vegans and vegetarians are advised to consume more total protein — to ensure each meal delivers enough leucine (~2–3 g) to fully stimulate MPS. Soy, hemp, and quinoa are the best plant sources of leucine- rich complete proteins.

Frequently Asked Questions

How much protein do I need per day?

It depends on your goal. For muscle gain, 1.6–2.2 g/kg of body weight is the evidence-based recommendation. For fat loss, 1.8–2.2 g/kg helps preserve muscle while in a calorie deficit. For maintenance, 1.2–1.6 g/kg is adequate for most active adults. Sedentary individuals need less — around 0.8 g/kg — but this is the bare minimum, not the optimum.

Is it possible to eat too much protein?

Protein intakes up to 3.5 g/kg/day have been shown to be safe in healthy adults with no kidney disease. Above 2.2–2.5 g/kg, additional protein provides no further muscle-building benefit — excess is simply used for energy. Very high protein diets can crowd out other important food groups, so staying in the 1.6–2.2 g/kg range is practical and sufficient.

Does protein timing matter?

Research shows that spreading protein across 3–5 meals is better than consuming it all in one sitting. Each meal stimulates muscle protein synthesis (MPS), and the stimulus plateaus at roughly 25–40 g of high-quality protein per meal. A pre- or post-workout meal containing 30–50 g of protein maximises MPS during the training window.

What counts as a complete protein?

A complete protein contains all nine essential amino acids in adequate amounts. Animal sources (chicken, beef, fish, eggs, dairy) are all complete proteins. Plant sources are often incomplete — notable exceptions include soy, quinoa, and hemp seeds. Vegans and vegetarians can get all essential amino acids by eating a variety of plant proteins throughout the day.

Do I need protein supplements?

No — whole food sources are equally effective and generally preferred. Protein supplements like whey, casein, or plant-based powders are convenient tools for reaching daily targets, not requirements. If you consistently hit your protein goal through food, supplements add no additional benefit.

How much protein should I eat if I am vegetarian or vegan?

Plant protein sources generally have lower digestibility and less favourable amino acid profiles than animal sources. As a practical buffer, vegetarians and vegans may want to target the higher end of the recommended range (2.0–2.2 g/kg) and prioritise soy, lentils, tofu, tempeh, seitan, and legumes to ensure adequate leucine for muscle protein synthesis.

What are the best high-protein foods?

Top protein-dense foods include: chicken breast (~31g/100g), canned tuna (~30g/100g), lean beef (~26g/100g), eggs (~13g/100g), Greek yogurt (~10g/100g), cottage cheese (~11g/100g), lentils (~9g/100g cooked), tofu (~8g/100g), and edamame (~11g/100g). Whey protein powder (~80g/100g) is the most concentrated single source.

Does cooking affect the protein content of food?

Cooking does not destroy protein — but it does change water content, which affects the grams-per-100g figure. A raw chicken breast may show 22g/100g protein, while cooked (and therefore denser due to water loss) shows 31g/100g. Always track the form you will be eating (raw vs cooked), or use a food tracking app that specifies the state.