How Much Protein Per Day: The Evidence-Based Guide to Setting Your Target

If you have searched "how much protein per day" you have likely found answers ranging from 50g to 250g. The spread exists because the answer genuinely depends on your goal, your body weight, and whether you are in a calorie deficit — and because most sources cite the minimum required to avoid deficiency rather than the amount that produces the best body composition outcome.

This guide covers the evidence-based range, explains why the standard recommendation falls short for most people who are actively trying to lose fat or retain muscle, and gives you a worked calculation you can apply to your own numbers today.

The RDA Is a Floor, Not a Target

The official recommended dietary allowance (RDA) for protein is 0.8g per kilogram of body weight per day. For an 80kg person, that is 64g. Most people interpret this as the target. It is not — it is the minimum needed to prevent muscle breakdown in a sedentary adult who is eating enough calories.

The RDA was derived from nitrogen balance studies on people at rest who were not restricting food. If you are in a calorie deficit, increasing training frequency, or trying to hold on to lean mass while losing fat, the 0.8g/kg figure is not meaningful for your context.

A 2016 systematic review and meta-analysis in the British Journal of Sports Medicine (Morton et al.) found that protein intakes above 1.62g/kg/day produced no additional lean mass gains in resistance-trained individuals. For muscle retention, the meaningful range is approximately 1.6–2.0g/kg. For aggressive fat loss phases with a significant calorie deficit, the evidence supports going higher — up to 2.0–2.4g/kg — because the deficit itself increases the rate at which the body turns to muscle for fuel.

Why Protein Targets Change in a Calorie Deficit

During a calorie surplus or maintenance phase, dietary protein is used primarily for tissue repair and synthesis. During a deficit, the body faces competing demands: it needs to produce glucose from non-carbohydrate sources (gluconeogenesis), and muscle tissue becomes an available substrate. Higher protein intake suppresses this process and provides a large enough amino acid pool to support muscle protein synthesis despite the energy shortfall.

Three mechanisms make higher protein particularly useful during a cut:

• Thermic effect of food (TEF): Protein costs 20–30% of its calories to digest and metabolise, compared to 5–10% for carbohydrates and 0–3% for fat. This is not a trivial difference — on 160g of protein per day, roughly 128–192 calories are spent on digestion alone.
• Satiety: Protein is the most satiating macronutrient. Studies consistently show higher protein diets reduce hunger ratings and spontaneous calorie intake, which matters when you are running a deficit and actively fighting hunger signals.
• Muscle retention: The Layman et al. (2003) study demonstrated that a higher protein diet (1.6g/kg) produced significantly greater lean mass retention and fat loss compared to the RDA-level diet (0.8g/kg) even at the same total calorie intake.

Practical Targets by Goal

Goal	Protein Target	Notes
Sedentary adult, maintenance	0.8–1.2g/kg	RDA minimum is adequate; upper end protects muscle as you age
Active, maintenance or mild surplus	1.4–1.8g/kg	Supports training adaptation and recovery
Fat loss (moderate deficit)	1.6–2.0g/kg	Muscle retention during 300–500 cal deficit
Aggressive fat loss (large deficit)	2.0–2.4g/kg	Deficit above 500 cal; preserves lean mass when gluconeogenesis pressure is high
Building muscle, surplus	1.6–2.2g/kg	Above 2.2g/kg shows minimal additional MPS benefit in most research

Note that these targets are expressed in grams per kilogram of body weight, not lean mass. For most people the calculation is simple. If you are significantly above your goal weight (30kg or more to lose), using a target body weight instead of current body weight gives a more practical number — calculating 2.2g/kg on 140kg of body weight gives a protein target that would be very difficult to hit and is not proportionally more effective than a more moderate intake.

Worked Calculation: 75kg Person in a Fat Loss Phase

Body weight: 75kg
Goal: Fat loss with muscle retention
Target: 2.0g/kg

Daily protein target: 75 x 2.0 = 150g protein

At 4 calories per gram of protein, that is 600 calories from protein. If the total daily target is 1,700 calories, protein accounts for 35% of total intake — which is consistent with the upper end of the commonly recommended protein range for fat loss (25–40% of calories).

Protein Distribution: Per-Meal Targets Matter

Total daily protein matters most, but the distribution across meals has a meaningful secondary effect on muscle protein synthesis (MPS). The research on per-meal protein thresholds suggests:

• A minimum of 0.4g/kg per meal is required to maximally stimulate MPS. For a 75kg person, that is 30g per meal.
• MPS peaks at approximately 20–40g per meal and does not increase substantially above that threshold — though excess protein is not wasted, it is used for energy or other metabolic processes.
• 3–5 protein-containing meals per day is a practical distribution for hitting a 150g target without relying on a single oversized portion.

A practical 150g distribution across 4 meals:

• Breakfast: 40g (e.g. Greek yogurt 200g + 3 eggs scrambled) — see High-Protein Breakfast Ideas
• Lunch: 40g (e.g. 180g cooked chicken breast + cottage cheese 100g)
• Dinner: 45g (e.g. 200g salmon fillet + 150g non-fat Greek yogurt)
• Snack or post-workout: 25g (e.g. protein shake or 200g cottage cheese)

The Weighing Problem: Why Estimates Miss by 30–50%

Protein tracking errors fall into two categories: food selection errors and quantity errors. Most guides address the first and ignore the second.

Quantity errors are larger than most people assume:

• Chicken breast loses 25–30% of its weight during cooking. A 200g raw breast becomes approximately 140–150g cooked. If you log "200g chicken breast" using the cooked weight, you are underestimating by 30–40g of protein in that meal alone.
• Greek yogurt ranges from 8g to 13g of protein per 100g depending on the brand and whether it is strained or unstrained. A 200g serving can deliver 16g or 26g — a 63% difference from the same food category.
• Protein powder scoop volumes vary across brands. One scoop of different products ranges from 20g to 35g of powder, with protein content from 60% to 85% of the scoop weight. Scooping without weighing introduces 5–10g of error per serving.
• Cottage cheese ranges from 10g to 14g of protein per 100g depending on fat content and brand.

Using a kitchen scale and weighing raw ingredients before cooking — or referencing cooked weights explicitly against the correct database entry — is the only reliable way to track protein accurately. A food scale accurate to 1g resolves all of these errors. Eyeballing portions of high-protein foods consistently underestimates serving sizes and makes protein targets effectively untrackable.

Best Foods for Hitting Protein Targets

Not all protein sources are equal for the purpose of hitting targets within a calorie budget. The relevant metric is protein per calorie — a high protein-to-calorie ratio lets you hit your daily gram target without crowding out the fat and carbohydrate you need for performance and adherence.

For a full ranked list with serving sizes, see: Best Protein Sources for Weight Loss and Best High-Protein Low-Calorie Foods.

High-efficiency sources by protein-to-calorie ratio:

• Egg whites: 10.8g protein / 50 cal per 100g raw
• Fat-free cottage cheese: 12g protein / 72 cal per 100g
• Chicken breast (raw): 23g protein / 120 cal per 100g
• White fish (cod, hake, pollock): 18–20g protein / 80–90 cal per 100g
• Non-fat Greek yogurt: 10–13g protein / 55–65 cal per 100g
• Tuna canned in brine: 24g protein / 103 cal per 100g
• Turkey mince (extra lean): 22g protein / 115 cal per 100g

Post-workout timing is one of the most practical windows to hit 30–40g in a single sitting. For specific post-workout meal ideas with protein breakdowns, see: Best Post-Workout Foods.

What About Plant-Based Protein?

Plant proteins are complete in some sources — soy, quinoa, hemp — and incomplete in others. For practical purposes, if you are eating a varied plant-based diet and hitting your gram target, amino acid completeness is not a significant issue. The more relevant consideration is protein-per-calorie: legumes and grains tend to carry more carbohydrate alongside their protein than animal sources, so hitting 150g of protein from plant sources typically means eating more total food volume or using protein powders to close the gap.

Protein powder — whether whey, casein, or plant-based — is a practical tool for hitting targets that would otherwise require impractically large food volumes. For a full breakdown of types and how to use them in a fat loss context, see: Protein Powder for Weight Loss.

How to Set Your Full Macro Split

Setting a protein target is step one of macro setup. Once protein is fixed, you set fat (minimum 0.5–1.0g/kg for hormonal function), and carbohydrates fill the remaining calorie budget. For the full macro-setting process including how to calculate TDEE and set deficit targets, see: How to Count Macros for Weight Loss.

Key Takeaways

• The RDA of 0.8g/kg is a deficiency prevention floor, not a body composition target
• For fat loss with muscle retention: 1.6–2.0g/kg; for aggressive deficits: 2.0–2.4g/kg
• Per-meal target of approximately 0.4g/kg (around 30g for a 75kg person) maximises muscle protein synthesis across the day
• Quantity errors — cooking weight loss, brand variation, scoop inconsistency — are larger than food selection errors; weighing is the only reliable fix
• Prioritise high protein-per-calorie sources such as egg whites, white fish, chicken breast, and fat-free dairy to hit targets within a calorie budget

Related Reading

• Best Protein Sources for Weight Loss
• Best High-Protein Low-Calorie Foods
• High-Protein Breakfast Ideas: 10 Options With Exact Macros
• Protein Powder for Weight Loss

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