Protein Calculator
Calculate your daily protein target in grams based on body weight, activity level, and goal. Get per-meal targets, understand why the 0.8g/kg RDA is insufficient for most active people, and see protein content of common foods.
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Tips & Notes
- ✓The RDA of 0.8g/kg was set to prevent deficiency in sedentary adults — not to optimize health, body composition, or exercise performance. Any active adult benefits from at least 1.4g/kg.
- ✓Calculate protein needs based on goal body weight or lean body mass if you are significantly overweight — fat tissue has minimal protein requirements, so basing targets on total weight overestimates needs.
- ✓Leucine is the critical amino acid that triggers muscle protein synthesis. Each main meal should contain at least 2–3g of leucine — found in approximately 25–35g of chicken, fish, eggs, or dairy protein.
- ✓Pre-sleep protein (30–40g of slow-digesting casein from cottage cheese or Greek yogurt) has consistent evidence for supporting overnight muscle protein synthesis and reducing muscle breakdown during fasting sleep.
- ✓Plant-based eaters should target 10–15% above omnivore recommendations and prioritize soy, quinoa, legumes combined with grains, and consider leucine supplementation if struggling to hit targets.
Common Mistakes
- ✗Using total body weight for protein calculation when significantly overweight — this inflates the target considerably. Use goal weight or lean body mass as the basis.
- ✗Concentrating most daily protein in one or two large meals — distributing 25–40g across 4 meals produces more total daily MPS than the same amount in fewer, larger doses.
- ✗Assuming any protein source is interchangeable — animal proteins (chicken, fish, eggs, dairy) have higher leucine content and digestibility than most plant proteins, making them more efficient per gram.
- ✗Chasing arbitrary high targets like 3g/kg without evidence — above 2.2–2.4g/kg, muscle-building benefit plateaus for most people, though there is no harm in higher intakes if they fit within calorie goals.
- ✗Relying primarily on protein supplements before optimizing whole food sources — real food provides additional nutrients (creatine in meat, calcium in dairy, iron and fiber in legumes) that supplements lack.
Protein Calculator Overview
Protein requirements are higher than most people realize, lower than most protein supplement marketing suggests, and more variable across life stages and goals than any single number can capture.
Daily protein targets by goal:
Evidence-based daily protein targets (per kg body weight): Sedentary adults (minimum, general health): 0.8–1.0 g/kg Recreational exercisers (active lifestyle): 1.2–1.6 g/kg Muscle building (resistance training): 1.6–2.2 g/kg Fat loss with muscle preservation: 2.0–2.4 g/kg Older adults (55+, any activity level): 1.6–2.0 g/kg Elite athletes during high training load: 1.8–2.5 g/kg
EX: Male, 82 kg, resistance training 4× per week, maintenance goal Target: 82 × 1.8 g/kg = 148g protein/day Caloric contribution: 148 × 4 kcal/g = 592 kcal from protein Spread over 4 meals: 37g per meal minimum Food equivalents to hit 148g: 250g cooked chicken breast (78g) + 200g Greek yogurt (20g) + 3 eggs (18g) + 100g tuna (26g) + 25g whey protein shake (20g) = ~162g total
Per-meal protein targets for muscle protein synthesis:
Per-meal protein for muscle protein synthesis (MPS): Minimum leucine per meal to trigger anabolic response: 2–3g Practical minimum per meal: 0.4 g protein per kg body weight For 80 kg person: 0.4 × 80 = 32g per meal Upper limit per meal (diminishing MPS returns): ~55–60g Optimal meal spacing: every 3–5 hours for sustained MPS stimulation
EX: Female, 60 kg, fat loss goal, target 2.0 g/kg = 120g/day Per-meal target: 60 × 0.4 = 24g minimum (4 meals) Meal 1 breakfast: 2 eggs + 150g Greek yogurt = 12 + 15 = 27g Meal 2 lunch: 150g chicken breast = 47g Meal 3 dinner: 120g salmon = 28g Meal 4 snack: 25g whey protein = 20g Total: 122g — on target. Pre-sleep casein (cottage cheese) optional for overnight MPS.
Evidence-based daily protein targets by goal and population:
| Goal / Population | Recommended range (g/kg) | Key reason for higher target |
|---|---|---|
| Sedentary adult | 0.8–1.0 | RDA minimum for tissue maintenance |
| Recreationally active | 1.2–1.6 | Supports exercise recovery and immune function |
| Building muscle | 1.6–2.2 | Maximizes muscle protein synthesis |
| Losing fat (deficit) | 2.0–2.4 | Calorie restriction impairs MPS; higher intake compensates |
| Adults 55+ | 1.6–2.0 | Anabolic resistance requires larger per-meal doses |
| Plant-based diet | Add 10–15% above omnivore | Lower leucine content and digestibility of plant proteins |
Protein source quality — content and leucine per 100g:
| Food source | Protein per 100g | Leucine per serving | Practical notes |
|---|---|---|---|
| Chicken breast (cooked) | 31g | 2.4g/100g | Lean, versatile, high satiety |
| Canned tuna (in water) | 26g | ~2.0g/100g | Convenient, affordable |
| Salmon (cooked) | 25g | ~2.0g/100g | Adds omega-3 EPA+DHA |
| Greek yogurt (0% fat) | 10g | ~0.8g/100g | Casein-dominant, slow-digesting |
| Eggs (whole) | 13g | 1.1g/100g | Complete amino acid profile |
| Lentils (cooked) | 9g | 0.6g/100g | Plant source — lower leucine |
| Whey protein powder | 75–80g | 8–10g/100g | Fastest digesting, highest leucine |
Research on the protein intake ceiling consistently shows diminishing returns above approximately 2.2g/kg for muscle building in natural trainees — this does not mean there is harm in exceeding it, only that the additional muscle building benefit beyond this level is minimal. For fat loss specifically, higher protein (2.0–2.4g/kg) remains beneficial even above this threshold because it further reduces spontaneous appetite, preserves lean mass during the deficit, and has a higher thermic effect that slightly increases total daily energy expenditure.
Frequently Asked Questions
For a sedentary adult whose only goal is to prevent protein deficiency, 0.8g/kg is the minimum established by the RDA. But this level was derived from nitrogen balance studies in the most sedentary conditions possible, and it does not represent optimal intake for health, muscle preservation, immune function, or satiety. Multiple studies show that active adults eating 1.4–1.8g/kg have better body composition, lower injury rates, and better recovery than those at 0.8g/kg with the same exercise program. The RDA is a floor, not a target — most active people benefit from substantially more.
In healthy adults with no pre-existing kidney disease, multiple long-term studies up to 2 years at intakes as high as 3g/kg have found no adverse renal effects. The kidneys adapt to higher protein intake by increasing filtration capacity — this adaptation is not damage. The concern originated from studies in patients who already had chronic kidney disease (CKD), for whom protein restriction is sometimes clinically appropriate to slow disease progression. If you have diagnosed kidney disease, follow your nephrologist's specific protein guidance. For everyone else with healthy kidneys, protein intakes up to 2.5g/kg are well within safe limits based on current evidence.
Total daily protein intake is the primary driver of muscle building — timing is secondary but worth optimizing. The historically emphasized "anabolic window" of 30 minutes post-workout is not supported by current research when daily protein targets are met. A more evidence-based approach: consume a protein-containing meal 1–3 hours before training and another within 2 hours after. If you train fasted, post-workout protein is more important. The pre-sleep meal (30–40g of slow-digesting casein) has the strongest timing-specific evidence — the 7–8 hour overnight fast is the longest protein gap most people experience, and casein provides a sustained release during this period.
Protein needs increase with age, not decrease. Older adults (55+) experience anabolic resistance — a blunted muscle protein synthesis response to the same protein dose that effectively builds muscle in younger adults. Research consistently shows that adults over 55 require 1.6–2.0g/kg to achieve the same muscle maintenance effect that 1.4g/kg provides in younger adults. Individual meals also need to be larger to trigger MPS in older adults — while younger adults may adequately stimulate MPS with 20–30g per meal, older adults may need 35–45g per meal to overcome reduced anabolic sensitivity. This higher protein need, combined with often-reduced appetite, makes adequate protein the highest nutrition priority for healthy aging.
Plant proteins are effective but require some attention to compensate for lower leucine content and digestibility. The primary differences: animal proteins typically contain more leucine per gram (the key anabolic amino acid), while plant proteins vary widely and generally contain less leucine relative to total protein content. Soy, quinoa, and mycoprotein (Quorn) are the plant proteins closest to animal protein in leucine content and amino acid completeness. The standard recommendation for plant-based athletes and active people is to target 10–15% above omnivore protein recommendations (so 1.8–2.5g/kg for muscle building rather than 1.6–2.2g/kg) and to combine protein sources throughout the day to ensure amino acid completeness.
Yes, through several mechanisms. First, protein has the highest thermic effect of any macronutrient — approximately 25–30% of protein calories are burned in digestion, versus 6–8% for carbs and 2–3% for fat. Second, protein is the most satiating macronutrient per calorie, reducing spontaneous appetite and making calorie control easier without active restriction. Third, during a calorie deficit, higher protein intake (2.0–2.4g/kg) preserves significantly more lean mass than lower intakes, which maintains resting metabolic rate and produces better body composition at the same scale weight. Multiple meta-analyses confirm that high-protein diets (25–35% of calories from protein) produce modestly but consistently better fat loss outcomes than lower-protein diets at equivalent calories.