Daily Protein Intake Calculator

How Much Protein You Need?

Protein needs vary widely by activity and goal. NHS RDA (minimum to prevent deficiency): 0.75g/kg/day. For a 75kg adult: ~56g/day. This is a MINIMUM, not an optimal target. Evidence-based targets by goal: sedentary adult (health): 0.8-1.2g/kg. Active adult (general fitness): 1.2-1.6g/kg. Muscle gain: 1.6-2.2g/kg. Meta-analyses suggest ~1.6g/kg as the practical threshold for maximising muscle protein synthesis. Fat loss (preserving muscle): 1.8-2.4g/kg. Higher protein intake protects muscle mass during a calorie deficit, which is why the recommended range increases specifically when the goal is fat loss rather than maintenance.

What do I need to know about Protein Quality and Sources?

Protein quality depends on amino acid profile and digestibility. Complete proteins (all essential amino acids): meat, poultry, fish, eggs, dairy. Soy, quinoa (plant-based complete proteins). Incomplete proteins (missing some amino acids): most plant sources individually (beans, grains, nuts). Easily combined for completeness (beans + rice, hummus + bread). High-protein foods (per 100g): chicken breast: 31g. Lean beef: 26g. Salmon: 25g. Tuna: 30g. Greek yoghurt: 10g. Cottage cheese: 11g. Eggs: 13g per 100g, alongside a complete amino acid profile that makes them one of the most efficient whole-food protein sources available.

What should I know about Protein Timing and Distribution?

Total daily protein matters most, but distribution helps: spread protein across 3-4 meals rather than one large dose. Each meal triggering muscle protein synthesis requires ~0.4g/kg or 20-40g protein. A 75kg person aiming for 2g/kg (150g): roughly 4 meals of 35-40g works well. Per-meal threshold: muscle protein synthesis plateaus around 40g per meal for most people. Eating 100g in one sitting doesn't build more muscle than 40g — spread it out. Post-workout 'anabolic window': less critical than once believed — total daily protein intake matters far more than eating protein within a specific narrow window after training.

What do I need to know about Practical Application?

Hitting protein targets practically: prioritise protein at each meal (build meals around a protein source). Include protein at breakfast (often the lowest-protein meal — eggs, Greek yoghurt, protein smoothie). Use whey protein to fill gaps economically (cheaper per gram than most whole-food protein). Snack on high-protein options (Greek yoghurt, cottage cheese, jerky, edamame). Plant-based eaters: combine sources, eat more total volume, consider soya and pea protein. Common pitfalls: under-eating protein at breakfast, relying too heavily on supplements instead of whole foods, and not adjusting intake upward when calories are reduced for fat loss.

How Does Protein Need Change With Age?

Protein requirements for healthy adults rise somewhat with age because of anabolic resistance — older muscle tissue responds less efficiently per gram of protein consumed than younger muscle, requiring a larger dose to trigger the same amount of muscle protein synthesis. Where general adult guidance is often 0.8g/kg (RDA minimum) up to 1.6-2.2g/kg for active individuals, research in adults over roughly 65 generally recommends at least 1.0-1.2g/kg even at a sedentary activity level, rising into the same 1.6g/kg+ range as younger adults when resistance training is involved, specifically to counter age-related muscle loss (sarcopenia). This is one reason protein intake is increasingly emphasised in older-adult nutrition guidance even for people with no specific fitness goals — adequate protein combined with resistance training is one of the few interventions shown to meaningfully slow sarcopenia.

Can You Eat Too Much Protein?

For healthy adults with normal kidney function, research has not established an upper safety limit for protein intake within the ranges typically consumed even by bodybuilders (up to roughly 3-3.5g/kg bodyweight), and concerns about protein damaging healthy kidneys are not supported by controlled studies in that population. The more relevant practical limits are opportunity cost and comfort — protein is the most satiating macronutrient, so very high intakes can crowd out carbohydrate and fat needed for training performance and can cause digestive discomfort for some people. The clearer caution applies to people with existing kidney disease, for whom high protein intake can accelerate decline and who should follow medical advice on intake rather than general fitness guidance. For the average training adult, intakes above roughly 2.2g/kg generally produce no additional muscle-building benefit over that level, so there is a practical ceiling of usefulness well before any safety concern would arise.

Does Protein Help With Appetite Control During Fat Loss?

Protein is the most filling of the three macronutrients, calorie for calorie, which is one reason higher-protein diets tend to make a calorie deficit easier to sustain. Several mechanisms are involved: protein slows gastric emptying so food stays in the stomach longer, it triggers a stronger release of satiety hormones like GLP-1 and PYY than carbohydrate or fat, and digesting it has a higher "thermic effect" — the body burns more energy processing protein than processing the same number of calories from fat. In practical terms, a meal built around a substantial protein source alongside vegetables and a moderate carbohydrate portion tends to keep hunger controlled for longer than a similarly-sized meal skewed toward refined carbs or fat. This matters most during a cut, when total calories are already reduced and hunger is the main threat to adherence. It's also part of why higher-protein diets are consistently associated with better fat-loss maintenance in research, independent of the exact calorie deficit used — people simply find it easier to stick with the plan. The effect isn't unlimited: spreading protein across three to five meals a day appears to support satiety better than front- or back-loading it into one meal, and pairing protein with fibre-rich vegetables compounds the fullness effect further.

Worked Example: Daily Protein Target and Meal Distribution for a 70kg Athlete

A 70kg recreational athlete training for muscle gain targets 1.8g protein per kg bodyweight: 70 × 1.8 = 126g protein/day. Spread across 4 meals to stay near the roughly 30-40g per-meal range associated with maximising the muscle protein synthesis response:

This totals 126g across the day while keeping each individual dose within the range research suggests effectively stimulates muscle protein synthesis, rather than concentrating most of the daily total into one or two very large servings.

Protein Needs for Vegans and Vegetarians

Plant-based eaters can meet the same evidence-based protein targets as anyone else, but it typically takes more deliberate planning, for two main reasons: most individual plant protein sources are 'incomplete' (missing or low in one or more essential amino acids, usually lysine in grains or methionine in legumes) and need combining across the day — not necessarily the same meal — to supply a full amino acid profile, and plant proteins are generally somewhat less digestible and have a lower leucine content (a specific amino acid especially important for triggering muscle protein synthesis) gram-for-gram than animal sources. Research on plant-based athletes generally suggests aiming for the higher end of standard protein recommendations, and prioritising combining varied sources — legumes, whole grains, soy (a notably complete plant protein alongside quinoa), nuts and seeds — across the day. Soy protein in particular, including tofu, edamame and soy milk, is well-studied and considered comparable to animal protein for supporting muscle protein synthesis, making it a particularly useful anchor for vegan protein planning.

Plant Protein Sources Compared (per 100g)

For plant-based eaters building meals around protein targets, knowing the real protein density of common whole-food options avoids relying on guesswork:

Because plant sources are generally less protein-dense by weight than meat, fish or dairy, hitting the same total daily protein target typically requires a larger volume of food overall — a practical consideration worth planning around rather than a reason to assume plant-based protein targets can't be met.

Protein and Kidney Health: Separating Myth From Evidence

A persistent claim is that high protein intake damages healthy kidneys, but the research doesn't actually support this for people without pre-existing kidney disease. Studies following athletes and bodybuilders consuming well above standard protein guidelines for extended periods have generally found no meaningful decline in kidney function markers, even at intakes of 2.0-3.0g per kg of body weight sustained over months to years. The concern is real, however, for people who already have reduced kidney function or diagnosed kidney disease, where a damaged kidney may struggle to filter and excrete the additional nitrogenous waste from higher protein intake, potentially accelerating existing decline. This is why protein restriction is sometimes part of managing established kidney disease but is not a general preventive health recommendation for people with normal kidney function. Anyone with a known kidney condition, or diabetes with early signs of kidney involvement, should check with their doctor before adopting a high-protein diet, but for the general healthy population, protein intake well above the bare minimum RDA is not supported as a kidney risk by current evidence.