The Daily Protein Needs Calculator computes how many grams of protein you need per day.
Based on body weight, activity level, and goal (maintenance, muscle gain, fat loss). Includes a protein source table (eggs, chicken breast, tempeh, tofu, fish) and a meal-timing distribution guide.
Disclaimer: Individual needs may vary. Consult a nutritionist for specific diet programs.
Calculator information
📋 How to use this calculator
- Enter your body weight in kilograms (use a morning scale reading after using the bathroom, before eating).
- Select activity level: sedentary (desk job with no exercise), light (exercise 1-3 days/week), moderate (4-5 days/week), or heavy (athletes, intensive weight training).
- Choose a goal: maintenance, muscle gain, or fat loss (caloric deficit).
- Press Calculate to get your daily protein requirement in grams along with a recommended distribution across 4-5 meals.
- Use the protein source table (eggs, chicken, fish, beans, tofu) to design a daily menu that hits your target.
- Tip: consume 0.3-0.4 g/kg per meal for optimal muscle protein synthesis; avoid stacking all protein in a single sitting.
🧮 Daily Protein Requirement
Protein (g/day) = Body Weight (kg) × Goal Factor
- Sedentary / baseline RDA = 0.8 g/kg
- Light to moderate activity = 1.2-1.6 g/kg
- Muscle gain / resistance training = 1.6-2.2 g/kg
- Fat loss (caloric deficit) = 1.8-2.4 g/kg to preserve muscle
- Older adults (65+) = 1.0-1.2 g/kg
Figures based on ISSN Position Stand 2017 and USDA Dietary Reference Intakes (DRI).
💡 Worked example: Male, 70 kg (154 lb), weight trains 4x/week, wants muscle gain
Given:- Body weight = 70 kg
- Goal = muscle gain
- Factor = 1.8 g/kg
Steps:- Total protein: 70 × 1.8 = 126 g/day.
- Split across 4 meals: 126 ÷ 4 ≈ 32 g per serving.
- Equivalent: 4 eggs (24 g) + 5 oz chicken breast (45 g) + 3.5 oz tofu (19 g) + 1 scoop whey (24 g) + 7 oz milk (7 g).
Result: Daily target of 126 g protein, distributed across 4-5 meals of 25-35 g each.
❓ Frequently asked questions
Does high protein intake damage the kidneys?
In healthy adults without pre-existing kidney disease, intake up to 2.2 g/kg/day is safe according to Antonio et al. (2016) and ISSN reviews. The at-risk groups are those with chronic kidney disease (CKD) or advanced diabetes. Drink 30-40 ml/kg of body weight in water to support urea excretion. If you have any kidney history, consult a physician before a high-protein diet.
Which protein sources offer the best cost efficiency in the US?
Eggs deliver about 6 g protein each at roughly $0.25, one of the cheapest sources. Canned tuna averages 22 g per 3 oz can at ~$1.50. Chicken thighs ($2.50-3.50/lb) beat chicken breast ($4-6/lb) on cost per gram. Plant options: dried lentils provide 18 g/cup cooked at ~$0.15 per serving, tofu 10 g/3 oz at ~$0.50. USDA MyPlate recommends varying protein sources for a complete amino acid profile.
When is the best time to consume protein?
Distribute 25-40 g evenly every 3-4 hours (4-5 meals) to maximize muscle protein synthesis (MPS). Post-resistance training, 20-40 g of protein within 2 hours supports recovery. Pre-sleep protein (casein from dairy/cottage cheese) maintains overnight MPS. A high-protein breakfast suppresses appetite later in the day, useful for fat loss.
What are the protein needs for older adults in the US?
Per the PROT-AGE Study Group and updated USDA guidance, adults over 65 need 1.0-1.2 g/kg/day to prevent sarcopenia (muscle mass loss). During illness or recovery, this rises to 1.2-1.5 g/kg. Soft sources such as tofu, soft-boiled eggs, steamed fish, and Greek yogurt are recommended for easier chewing and digestion.
What is the difference between whey, casein, and plant protein?
Whey is absorbed rapidly (blood amino acid peak at 60-90 minutes), ideal post-workout. Casein digests slowly (4-6 hours), suiting pre-sleep use. Plant proteins (soy, peas, legumes) often require combining sources for a complete amino acid profile but are higher in fiber and phytonutrients. For muscle gain, look for supplements that are NSF Certified for Sport or Informed Sport tested to confirm purity and label accuracy.
📚 Sources & references
Last updated: May 11, 2026