Protein Intake
Calculator
Find your ideal daily protein target based on your body, goals, and activity level — including a full macro split, per-meal breakdown, and personalised food recommendations.
Why Protein Is the Most Important Macronutrient
Protein is the only macronutrient that directly builds, repairs, and maintains the structural tissues of the body — muscles, tendons, ligaments, skin, hair, nails, enzymes, hormones, and immune proteins are all made primarily from amino acids derived from dietary protein. No other macronutrient performs this foundational role.
per gram
(calories burned digesting)
found in protein
(body cannot make)
How Your Protein Target Is Calculated
Your protein target is calculated in two steps: first, your Total Daily Energy Expenditure (TDEE) is estimated using the Mifflin-St Jeor BMR equation combined with your activity multiplier; then a goal-specific protein multiplier is applied to your lean body weight.
Step 1 — BMR (Mifflin-St Jeor)
Male: (10 × kg) + (6.25 × cm) − (5 × age) + 5. Female: Same − 161. This estimates calories burned at complete rest. The Mifflin-St Jeor equation is validated as the most accurate single-equation BMR estimate for general adult populations.
Step 2 — TDEE (Activity Multiplier)
BMR × activity factor: Sedentary ×1.2; Lightly Active ×1.375; Moderately Active ×1.55; Very Active ×1.725; Extremely Active ×1.9. This reflects all daily energy expenditure — not just gym training.
Step 3 — Protein Multiplier by Goal
Fat Loss: 2.2g/kg (higher protein preserves muscle in a deficit). Maintenance: 1.6g/kg (adequate for muscle preservation and synthesis). Muscle Gain: 2.0g/kg (supports maximal muscle protein synthesis). Athletes add +0.2g/kg above very active level.
Step 4 — Macro Split
Remaining calories after protein are distributed between fat (27% of TDEE from fat) and carbohydrates (remaining calories). This produces a balanced macro split appropriate for each goal — not a fixed ratio that ignores individual calorie targets.
Protein Targets by Goal — The Research
Protein requirements vary significantly depending on your primary goal — whether you are trying to lose fat while preserving muscle, maintain body composition, or maximise muscle protein synthesis for muscle gain.
| Goal | Protein Target | Calorie Approach | Primary Protein Function | Evidence Level |
|---|---|---|---|---|
| 🔥 Fat Loss | 2.2–2.4g/kg | TDEE − 300–500 kcal deficit | Prevent muscle catabolism; maximise thermic effect; improve satiety | Very Strong |
| ⚖️ Maintenance / Recomp | 1.6–1.8g/kg | TDEE (maintenance) | Maintain lean mass; support training recovery; general health | Strong |
| 💪 Muscle Gain | 1.8–2.2g/kg | TDEE + 200–400 kcal surplus | Maximise muscle protein synthesis; support recovery from progressive overload | Strong |
| 🏃 Endurance Athletes | 1.4–1.8g/kg | High TDEE; carb-dominant | Muscle repair; glycogen preservation; immune function under high training load | Strong |
| 👴 Adults 60+ | 1.6–2.0g/kg | Often at or slightly below TDEE | Counter anabolic resistance; prevent sarcopenia; support bone and immune health | Very Strong |
Best Protein Sources — Ranked by Quality & Value
Not all protein sources are equal. Protein quality is determined by amino acid completeness (all 9 essential amino acids), leucine content (primary trigger for muscle protein synthesis), and digestibility (DIAAS score). Here are the top sources ranked across these dimensions.
| Food | Protein per 100g | Leucine Content | Quality (DIAAS) | Cost Efficiency |
|---|---|---|---|---|
| 🥚 Whole Eggs | 13g (raw) | High (~8.5% of protein) | Excellent (>1.0) | Outstanding — cheapest complete protein |
| 🐟 Salmon | 25g | Very High | Excellent | Good — also provides omega-3 DHA/EPA |
| 🍗 Chicken Breast | 31g (cooked) | Very High | Excellent | Outstanding — highest protein/calorie ratio |
| 🥛 Greek Yogurt (plain) | 10g per 100g | High | Excellent | Good — also provides calcium and probiotics |
| 🥩 Lean Beef | 26g (cooked) | Very High (~9%) | Excellent | Moderate — also provides iron, zinc, B12 |
| 🫘 Lentils | 9g (cooked) | Low-Moderate | Good (0.7) | Outstanding — cheapest protein per dollar |
| 💊 Whey Protein | 24g per 30g scoop | Highest (~10.9%) | Excellent | Good — highest MPS stimulation per gram |
| 🫘 Edamame | 11g (cooked) | Moderate | Good | Good — complete plant protein with fibre |
Protein Timing & Distribution
How you distribute protein across the day matters almost as much as hitting your daily target. Research on muscle protein synthesis shows clear advantages for even distribution across multiple meals — rather than consuming most protein in one sitting.
🕐 Even Distribution Wins
A 2016 meta-analysis (Areta et al.) found that distributing protein across 4 equal meals (25–40g each) produced 25% greater muscle protein synthesis over 12 hours than consuming the same total protein in fewer, larger doses. The MPS response plateaus at approximately 40g per meal — additional protein in a single sitting is oxidised rather than incorporated into muscle.
🏋️ Post-Workout Window
The post-workout anabolic window is real but broader than traditionally believed — research shows the MPS response to protein is elevated for 4–6 hours after resistance training, not just 30 minutes. Consuming 25–40g of protein within 2 hours post-training is sufficient to capture the anabolic window. Exact timing matters less than hitting the daily total.
🌙 Pre-Sleep Protein
40g of casein protein before sleep consistently produces higher overnight MPS rates and greater strength and muscle mass gains in multiple RCTs (Res et al., 2012; Trommelen & van Loon, 2016). This works because overnight fasting (8 hours) represents the longest daily period without amino acid availability — pre-sleep protein fills this gap.
🥣 Breakfast Protein
Consuming adequate protein at breakfast (25–35g) reduces total daily calorie intake by 15–20% in multiple studies through enhanced satiety — driven by GLP-1 and PYY hormones released in response to protein. Skipping protein at breakfast and front-loading it at dinner produces inferior body composition results at identical total daily protein intakes.
Protein & Fat Loss — The Science
High-protein diets produce superior fat loss outcomes compared to standard protein diets — even at identical calorie intakes. Four distinct mechanisms explain this effect, each independently supported by robust research.
🔥 Thermic Effect (TEF)
Protein burns 25–30% of its own calories during digestion — compared to 6–8% for carbohydrates and 2–3% for fats. On a 150g protein diet, approximately 150 kcal are expended in digestion alone, creating a meaningful metabolic advantage without any additional exercise.
💪 Muscle Preservation
During a caloric deficit, high protein intake (2.2g/kg+) dramatically reduces muscle catabolism — the body’s tendency to break down muscle for energy when calories are restricted. This is critical because maintaining lean mass sustains metabolic rate, preventing the metabolic adaptation that makes long-term fat loss progressively harder.
😋 Satiety Advantage
Protein is the most satiating macronutrient per calorie — stimulating GLP-1, PYY, and CCK (satiety hormones) while suppressing ghrelin (hunger hormone). High-protein diets reduce spontaneous calorie intake by 400–550 kcal/day in ad libitum (eat as much as you want) trials — making dietary adherence significantly easier.
🧬 Body Composition
High-protein diets produce preferential fat loss over muscle loss compared to standard protein diets at identical caloric deficits. Research shows high-protein dieters lose 3–4× more fat relative to muscle vs control groups — meaning the protein content of a diet determines body composition outcomes independently of calorie balance.
📉 Insulin Sensitivity
High-protein, lower-carbohydrate eating patterns improve insulin sensitivity and reduce fasting insulin — directly reducing the hormonal environment that promotes visceral fat storage. This effect is particularly pronounced in insulin-resistant individuals and those with PCOS or metabolic syndrome.
🔄 Muscle Recomposition
Simultaneous fat loss and muscle gain (body recomposition) is achievable with high protein intake (2.0–2.4g/kg) combined with resistance training — even at maintenance or slight deficit calories. This was previously thought impossible outside of beginner or steroid-assisted contexts, but multiple recent RCTs confirm it with adequate protein and training.
Protein Myths — Debunked by Research
Protein nutrition is one of the most myth-laden areas of nutrition science. These are the most common misconceptions — and what the actual evidence shows.
| Myth | What People Believe | What Research Shows | Evidence Level |
|---|---|---|---|
| “High protein damages kidneys” | Excess protein stresses kidneys and causes long-term damage | Only relevant if you already have kidney disease. In healthy individuals, high protein intake produces no detectable kidney harm across multiple long-term studies up to 2+ years | Debunked — Strong Evidence |
| “Your body can only absorb 30g per meal” | Any protein above 30g per meal is wasted | The body absorbs all protein consumed — the 30g “limit” applies only to the MPS response ceiling. Extra protein from large meals is used for energy, gluconeogenesis, or other metabolic functions, not lost | Debunked — Strong Evidence |
| “Protein turns to fat if you eat too much” | Excess protein automatically converts to body fat | Protein-to-fat conversion (de novo lipogenesis from amino acids) is extremely inefficient — far less likely than carbohydrate-to-fat conversion. Excess protein primarily increases TEF and oxidation, not fat storage | Largely Debunked |
| “Plant protein is inferior for muscle” | Animal protein is required for muscle building | Matched for leucine and total protein intake, plant protein produces equivalent MPS to animal protein. The key is consuming sufficient total protein — often requiring higher quantities from plant sources to match leucine content | Nuanced — Context Matters |
| “More protein always equals more muscle” | Eating as much protein as possible maximises muscle gain | Research consistently shows a plateau at approximately 1.6g/kg for MPS in non-dieting individuals. Above this, additional protein provides no additional muscle-building stimulus — though it may aid body composition during fat loss | Confirmed — Strong Evidence |
Protein & Ageing — Why Requirements Increase
Protein requirements increase with age — not decrease, as previously believed. Adults over 60 experience “anabolic resistance,” meaning their muscles respond less efficiently to the same protein stimulus that builds muscle in younger adults. This requires both higher protein intake and resistance training to overcome.
⚠️ Sarcopenia — The Hidden Epidemic
Sarcopenia (age-related muscle loss) affects approximately 30% of adults over 60 and 50% of adults over 80. Muscle loss accelerates to 1–3% per year after age 50, producing progressive metabolic slowdown, increased fall risk, insulin resistance, and reduced quality of life. Adequate protein is the primary dietary intervention.
✅ Higher Targets Required
The current EU Geriatric Society and ESPEN guidelines recommend 1.6–2.0g/kg/day for older adults (65+) — significantly above the general adult RDA of 0.8g/kg. This higher target is required to overcome anabolic resistance and stimulate the same degree of MPS that 1.2g/kg produces in younger adults.
✅ Leucine Threshold Elevation
Older adults require approximately 50% more leucine per meal (4–4.5g vs 2.5–3g in younger adults) to maximally stimulate MPS. This means choosing leucine-dense protein sources is more critical with age — whole eggs, whey, chicken, and beef are particularly important choices for older adults.
🏋️ Resistance Training Is Non-Negotiable
Protein alone cannot prevent sarcopenia — resistance training is the essential co-stimulus. Research shows that older adults who combine resistance training with adequate protein (1.8g/kg+) maintain near-peak muscle mass and strength into their 70s and 80s. Without the training stimulus, even high protein intake produces limited muscle maintenance.
Plant-Based Protein — Hitting Targets Without Meat
Achieving optimal protein targets on a vegetarian or vegan diet requires strategic food selection and higher total protein intake — because most plant proteins have lower leucine content and digestibility than animal sources. These strategies reliably close the gap.
🫘 Combine Protein Sources
Most plant proteins are “incomplete” — missing one or more essential amino acids. The combination strategy: legumes + grains (rice + beans; lentils + bread; hummus + pita) provides complementary amino acid profiles. These do not need to be eaten at the same meal — the body maintains an amino acid pool across the day.
📈 Increase Total Protein by 20–25%
Due to lower digestibility (DIAAS scores of 0.5–0.9 vs 1.0+ for animal proteins), plant-based eaters should target 20–25% higher total daily protein than calculator results suggest — e.g. a 2.0g/kg target becomes 2.4g/kg for a vegan. This compensates for lower absorption efficiency.
🌱 Highest-Quality Plant Proteins
Soy protein is the only plant protein with a DIAAS score of 1.0 (equivalent to animal protein). Edamame, tempeh, tofu, and soy milk are complete proteins suitable for muscle building. Pea protein combined with rice protein (approximately 70/30 ratio) produces a complete amino acid profile with high digestibility.
💊 Consider Plant Protein Supplements
Pea + rice protein blends, soy protein isolate, and hemp protein all provide practical protein supplementation for plant-based eaters. Look for products with a complete amino acid profile and leucine content above 8% of total protein — this is the key quality indicator for muscle-building effectiveness.
Protein & Hormonal Health
Dietary protein directly influences multiple hormonal pathways beyond the well-known muscle-building effects — including GLP-1 production, insulin sensitivity, thyroid hormone activity, and sex hormone synthesis. Understanding these connections explains why protein intake affects far more than just body composition.
| Hormone | How Protein Affects It | Practical Implication |
|---|---|---|
| GLP-1 (Appetite Hormone) | Protein is the most potent natural GLP-1 stimulator — amino acids directly trigger L-cell GLP-1 secretion, producing the satiety effect that pharmaceutical GLP-1 drugs mimic | Eating protein first at every meal maximises natural GLP-1 response and appetite regulation |
| Insulin | Protein stimulates insulin secretion (alongside carbohydrates) but also stimulates glucagon — producing a more balanced blood sugar response than carbohydrate alone | High-protein meals produce lower net insulin exposure than high-carb meals at equal calories |
| IGF-1 (Growth Factor) | Adequate protein intake maintains IGF-1 levels — essential for muscle repair, bone density, and immune function. Protein restriction suppresses IGF-1 | Low protein intake in older adults suppresses IGF-1, accelerating sarcopenia and bone loss |
| Testosterone | Very high protein (above 3.5g/kg) with very low fat may modestly reduce testosterone. Adequate fat intake (25–30% of calories) is required for testosterone synthesis — protein and fat work together | Avoid extremely high protein combined with very low fat; maintain 25%+ calories from fat |
| Thyroid (T3) | Very low protein intake suppresses active thyroid hormone (T3) production — protein provides tyrosine, the amino acid precursor to T3 and T4 synthesis | Chronic low protein intake is a contributing factor to subclinical hypothyroidism and metabolic slowing |
How to Track Protein Accurately
Protein tracking is the single highest-return nutritional habit for body composition goals. Research shows people who track protein hit their targets at 2–3× the rate of those relying on estimation — and produce significantly better body composition outcomes at identical calorie targets.
⚖️ Weigh Raw, Not Cooked
Cooked meat contains significantly less water than raw — a 200g raw chicken breast produces approximately 140–150g cooked. Always weigh protein sources in their raw state for consistent tracking, or use verified cooked-weight entries in your tracking app. A kitchen scale is the most important tool for accurate protein tracking.
📱 Use a Barcode Scanner App
Chronometer, MyFitnessPal, and Lose It all have barcode scanners that return complete nutritional data within 3 seconds of scanning packaged food. For unpackaged foods, search the USDA FoodData Central database — the most comprehensive and accurate free nutrition database available.
🎯 Protein First, Then Other Macros
Prioritise hitting your protein target precisely — allow ±10% flexibility on carbs and fat. Research shows the body composition benefit of protein accuracy far exceeds the benefit of carbohydrate or fat precision at equivalent tracking effort. If you only track one macronutrient, track protein.
📊 Weekly Average vs Daily Perfection
Missing your protein target by 20g on a given day does not meaningfully affect weekly results. Weekly average compliance — hitting your target 5–6 of 7 days — produces 90% of the benefit of perfect daily adherence. Focus on the weekly trend rather than daily perfectionism, which reduces sustainability.
Your Protein Intake Action Plan
Knowing your protein target is the first step — building a sustainable daily habit of reaching it is what produces results. This four-week progressive plan turns your calculated number into a consistent, manageable daily practice.
📅 Week 1 — Baseline Audit
Track everything you currently eat for 7 days without changing anything. This reveals your actual baseline protein intake. Most people discover they are hitting 60–70% of their optimal protein target — primarily from undereating at breakfast and underestimating protein needs at lunch. The gap is almost always at breakfast and lunch, not dinner.
📅 Week 2 — Protein at Every Meal
Add a clearly identifiable protein source to every meal — minimum 25g per meal. Plan your day around protein first, then fill in carbohydrates and fats. Keep protein-rich snacks available: Greek yogurt, hard-boiled eggs, cottage cheese, or a protein shake. Aim to reach 90% of your calculated target this week.
📅 Week 3 — Hit the Target
Aim to hit your calculated protein target every day this week. Use a food scale for all protein sources. Prepare protein for the next day in the evening — batch-cook chicken, hard-boil eggs, prep yogurt portions. This “protein first” preparation habit is the single biggest predictor of long-term protein target adherence.
📅 Week 4 — Build the System
Identify your 5–7 reliable “protein anchors” — foods you enjoy, have available, and know the protein content of precisely. Build every meal around one of these anchors. This removes the daily decision-making burden and makes hitting your target automatic rather than deliberate — the key to long-term consistency.
| Your Goal | Daily Protein Target | Best Protein Sources | Key Success Habit |
|---|---|---|---|
| 🔥 Fat Loss | 2.2–2.4g/kg body weight | Chicken breast, eggs, Greek yogurt, cottage cheese, whey protein | 25–35g protein at breakfast — sets appetite for the whole day |
| ⚖️ Maintain | 1.6–1.8g/kg body weight | Any complete protein source; variety matters for micronutrients | Protein at every meal — even small servings compound significantly |
| 💪 Build Muscle | 1.8–2.2g/kg body weight | Whey post-workout; casein before bed; varied leucine-rich sources | 40g casein before sleep — overnight MPS is the most underutilised muscle-building tool |
Consult a registered dietitian or healthcare provider for personalised nutrition advice.