Protein Calculator
Free Protein Calculator for health & fitness. Enter your measurements for personalized results with clear explanations and reference ranges.
Medical disclaimer: This calculator is provided for educational and informational purposes only and does not constitute medical advice, diagnosis, or treatment. Results are general estimates and may not reflect your individual circumstances. Always consult a qualified healthcare professional before making decisions about your health.
Formula
Protein (g) = Body Weight (kg) × Multiplier
Multiply your body weight by a factor based on your goal: 0.8 for minimum, 1.2-1.4 for active, 1.6-2.2 for muscle building.
Worked Examples
Example 1: Active Adult
Problem:75kg person with active lifestyle wants to know protein needs.
Solution:Active lifestyle range: 1.2-1.4 g/kg Minimum: 75 × 1.2 = 90g Maximum: 75 × 1.4 = 105g Recommended: 75 × 1.3 = 98g Meal distribution (3 meals): 98 ÷ 3 = 33g per meal Example day: Breakfast: 3 eggs + Greek yogurt = 30g Lunch: Chicken salad = 35g Dinner: Salmon + legumes = 35g
Result:90-105g daily (aim for ~98g)
Example 2: Muscle Building
Problem:80kg male focused on gaining muscle.
Solution:Muscle building range: 1.6-2.2 g/kg Minimum: 80 × 1.6 = 128g Maximum: 80 × 2.2 = 176g Recommended midpoint: 80 × 1.9 = 152g Meal distribution (4 meals): 152 ÷ 4 = 38g per meal This keeps intake within the evidence-based range for muscle protein synthesis.
Result:128-176g daily (recommended ~152g)
Example 3: Weight Loss
Problem:65kg female on calorie deficit for weight loss.
Solution:Weight loss range: 1.2-1.6 g/kg (Higher end helps preserve muscle) Minimum: 65 × 1.2 = 78g Recommended midpoint: 65 × 1.4 = 91g Maximum: 65 × 1.6 = 104g At 1400 calories: 91g protein = 364 calories = 26% of total calories This supports satiety and helps preserve lean mass while dieting.
Result:78-104g daily (recommended ~91g)
Frequently Asked Questions
How much protein do I need daily?
The RDA minimum is 0.8g/kg body weight for sedentary adults. However, research suggests active individuals benefit from 1.2-2.0g/kg. For muscle building, aim for 1.6-2.2g/kg. For weight loss, 1.2-1.6g/kg helps preserve muscle. Individual needs vary based on activity, age, and goals.
Can I eat too much protein?
For healthy individuals, high protein intake (up to 2.2g/kg or higher) shows no adverse effects in research. Concerns about kidney damage apply only to those with pre-existing kidney disease. Very high protein (3g/kg+) provides no additional muscle-building benefit and is unnecessary. Moderation is reasonable.
What are the best protein sources?
Complete proteins with all essential amino acids: meat, fish, eggs, dairy, soy. High-quality plant combinations: rice+beans, hummus+pita. Per serving leaders: chicken breast (31g/100g), Greek yogurt (10g/100g), eggs (6g each), tofu (8g/100g), lentils (9g/100g cooked).
Does protein timing matter?
Somewhat. Distributing protein evenly across meals (25-40g per meal) optimizes muscle protein synthesis better than one large dose. Post-workout protein (within 2-3 hours) supports recovery. However, total daily intake matters most - timing is secondary optimization.
How much protein per meal?
Research suggests 25-40g of protein per meal maximally stimulates muscle protein synthesis. More isn't wasted but doesn't provide additional muscle benefit. For a 150g daily target, aim for 3 meals of 40-50g or 4 meals of 35-40g plus snacks.
Is protein powder necessary?
No. Whole foods can meet protein needs. Powder is convenient when: struggling to hit targets, need portable options, post-workout convenience, calorie-restricted diets where every gram counts. Quality powders are safe but aren't superior to food protein.
Does protein help with weight loss?
Yes, protein aids weight loss by: increasing satiety (feeling full longer), having higher thermic effect (burns more calories during digestion), preserving muscle during calorie deficit, reducing cravings. Higher protein diets consistently show better weight loss outcomes in studies.
What about plant-based protein?
Plant proteins can meet all needs with variety. Combine different sources (grains + legumes) for complete amino acids. Plant proteins are typically less bioavailable, so aim slightly higher (10-20% more). Soy, quinoa, and buckwheat are complete plant proteins.
How much protein for elderly?
Older adults need more protein to maintain muscle (sarcopenia prevention). Recommendations: 1.0-1.2g/kg minimum, up to 1.5g/kg for active seniors. Distribute evenly across meals. Leucine-rich sources (dairy, meat) are particularly beneficial for stimulating muscle synthesis in elderly.
Does cooking affect protein?
Cooking doesn't significantly reduce protein content. It may slightly change amino acid availability but generally improves digestibility. Raw egg protein is only 50% bioavailable vs 91% when cooked. Don't worry about protein loss from cooking - focus on total intake.