Calculate your optimal daily protein intake based on body weight, activity level, and fitness goals. Get recommendations for muscle building and fat loss.
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Protein Intake Calculator, Fitness, Calculate your optimal daily protein intake based on body weight, activity level, and fitness goals. Get recommendations for muscle building and fat loss., daily protein needs, protein for muscle building, how much protein per day, calc, compute
Protein Intake Calculator
Calculate your optimal daily protein intake based on body weight, activity level, and fitness goals. Get recommendations for muscle building and fat loss.
daily protein needs, protein for muscle building, how much protein per day
Fitness global
Protein Intake Calculator, Fitness, Calculate your optimal daily protein intake based on body weight, activity level, and fitness goals. Get recommendations for muscle building and fat loss., daily protein needs, protein for muscle building, how much protein per day, calc, compute
Protein Intake Calculator
Calculate your optimal daily protein intake based on body weight, activity level, and fitness goals. Get recommendations for muscle building and fat loss.
Maintain current weight and general health
Your Daily Protein Goal
84g/day
1.2g/kg
Optimal
Energy Breakdown
How your protein fits into your daily energy budget
336
Protein kcal
13%
of Daily Calories
2,507
Est. TDEE
Protein Ranges
How your recommendation compares across different guidelines
Per-Meal Distribution
Split across 3 meals for optimal muscle protein synthesis (25–40g per meal)
Breakfast
22g
30%
Lunch
31g
37%
Dinner
31g
37%
Protein-Rich Foods
All protein sources to hit your 84g goal
Protein content of common foods
Food
Serving
Protein
Chicken Breast
150g (1 breast)
46.5g
Turkey Breast
150g
43.5g
Lean Beef
150g
39g
Salmon
150g fillet
37.5g
Shrimp
150g
36g
Tuna (canned)
1 can (120g)
31.2g
Tofu (firm)
150g
25.5g
Whey Protein
1 scoop (30g)
24g
Pea Protein
1 scoop (30g)
24g
Cottage Cheese
200g (1 cup)
22g
84g protein looks like:
1.8x Chicken Breast
1.9x Turkey Breast
2.2x Lean Beef
2.2x Salmon
What is Protein and Why Does It Matter?
The essential macronutrient for muscle, recovery, and overall health
Protein is one of the three macronutrients (along with carbohydrates and fats) essential for human health. It is made up of amino acids — the building blocks your body uses to build and repair muscle tissue, produce enzymes and hormones, support immune function, and maintain healthy skin, hair, and nails.
Of the 20 amino acids, 9 are "essential" — meaning your body cannot produce them and must get them from food. Complete protein sources (meat, fish, eggs, dairy, soy) contain all 9 essential amino acids. Incomplete sources (most plant foods) can be combined throughout the day to meet your needs.
How is Daily Protein Calculated?
Weight-based formula adjusted for your goal and activity
This calculator determines your optimal daily protein intake using a weight-based formula adjusted for your fitness goal and activity level:
Daily Protein (g) = Body Weight (kg) × Protein Multiplier (g/kg)
The protein multiplier is based on guidelines from the International Society of Sports Nutrition (ISSN), American College of Sports Medicine (ACSM), and meta-analyses of protein research:
Protein intake recommendations by goal
Goal
Range (g/kg)
Source
Sedentary / Maintenance
0.8 – 1.0
RDA / WHO
Active / General Fitness
1.2 – 1.6
ACSM
Muscle Building
1.6 – 2.2
ISSN / Meta-analysis
Fat Loss (preserving muscle)
1.6 – 2.4
ISSN
Body Recomposition
2.0 – 2.8
ISSN / Research
Older Adults (65+)
1.0 – 1.2+
ESPEN / PROT-AGE
Protein Timing and Meal Distribution
How to split your daily protein for maximum muscle protein synthesis
Research shows that distributing protein evenly across meals optimizes muscle protein synthesis (MPS). The key guidelines:
25–40g per meal maximizes MPS per feeding. Going above 40g does not significantly increase muscle building per meal.
3–5 meals per day is optimal for muscle protein synthesis. 2 meals per day can work for intermittent fasting, though each meal will contain a larger protein dose with diminishing MPS returns above 40g.
Post-workout protein (within 2 hours) is important but the "anabolic window" is wider than traditionally believed. Total daily intake matters most.
Before bed: A slow-digesting protein source (casein, cottage cheese) can support overnight muscle repair.
Common Protein Mistakes
Avoid these pitfalls to get the most from your protein intake
Eating too little protein during weight loss — This leads to muscle loss. When cutting calories, protein needs actually increase (1.6–2.4 g/kg) to preserve lean mass.
Loading all protein into one meal — Your body can only use ~25–40g per meal for muscle building. Spreading intake across meals is more effective.
Using the RDA as a target — The RDA of 0.8 g/kg is the minimum to prevent deficiency, not optimal for health or fitness. Most active people need significantly more.
Ignoring protein quality — Not all protein is equal. Animal and soy proteins are "complete" (contain all essential amino acids). Other plant proteins should be combined for completeness.
Worrying about kidney damage — For healthy adults, high-protein diets (up to 2.2 g/kg) have not been shown to cause kidney damage. However, those with pre-existing kidney disease should consult a doctor.
Protein Needs for Special Populations
Adjusted recommendations for pregnancy, aging, athletes, and plant-based diets
Protein recommendations for different populations
Population
Recommendation
Pregnant Women
+25g/day additional protein (total ~1.1 g/kg)
Breastfeeding Women
+20g/day additional protein
Older Adults (65+)
1.0–1.2 g/kg minimum to prevent sarcopenia (muscle wasting)
Endurance Athletes
1.2–1.4 g/kg to support recovery and glycogen replenishment
Strength Athletes
1.6–2.2 g/kg for optimal muscle protein synthesis
Vegans/Vegetarians
May need 10–20% more due to lower digestibility of plant proteins
Medical disclaimer: This calculator provides estimates for educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider for medical decisions.
Frequently Asked Questions
Common questions about protein requirements and dietary intake
It depends on your body weight, activity level, and goals. The RDA minimum is 0.8g per kg of body weight for sedentary adults. However, active individuals need 1.2–1.6g/kg, those building muscle need 1.6–2.2g/kg, and people losing fat while preserving muscle need 1.6–2.4g/kg. This calculator personalizes the recommendation based on your specific profile.
During weight loss, protein needs increase to prevent muscle loss. Research recommends 1.6–2.4g per kg of body weight when in a calorie deficit. For a 70kg person, that's 112–168g of protein per day. Select 'Fat Loss' as your goal in this calculator to get a personalized recommendation that preserves lean muscle mass during your cut.
For muscle building, research consistently shows 1.6–2.2g per kg of body weight is optimal. A landmark meta-analysis by Morton et al. (2018) found no additional benefit above 1.6g/kg for most people, though highly trained athletes may benefit from up to 2.2g/kg. Combine adequate protein with progressive resistance training for best results.
For healthy adults, there is no evidence that high protein intake (up to 2.2g/kg) causes kidney damage. Multiple long-term studies have confirmed this. However, individuals with pre-existing kidney disease should consult their doctor before increasing protein intake, as damaged kidneys may struggle to filter the byproducts of protein metabolism.
Complete protein sources containing all 9 essential amino acids include: chicken breast (31g/100g), eggs (13g/100g), Greek yogurt (10g/100g), salmon (25g/100g), tofu (17g/100g), and whey protein (24g/scoop). For vegans, combining legumes with grains (rice and beans, hummus and pita) provides complete protein profiles.
Research shows that distributing protein evenly across 3–5 meals maximizes muscle protein synthesis. Aim for 25–40g per meal. Going significantly above 40g in a single meal doesn't increase muscle building further — the excess is used for energy or other processes. For a 120g daily target, 4 meals of 30g each is more effective than 2 meals of 60g.
Yes. Adults over 65 need more protein (1.0–1.2g/kg minimum) to combat sarcopenia — age-related muscle loss. The PROT-AGE study group and ESPEN guidelines both recommend higher protein intake for older adults, combined with resistance exercise, to maintain muscle mass, strength, and functional independence.
Absolutely. Key vegan protein sources include tofu (17g/100g), tempeh (19g/100g), lentils (9g/100g cooked), chickpeas (9g/100g cooked), edamame (11g/100g), pea protein powder (24g/scoop), and quinoa (4.4g/100g cooked). Vegans may need 10–20% more total protein since plant proteins have lower digestibility than animal proteins.
The 'anabolic window' is wider than the traditional 30-minute myth. Research shows that consuming protein within 2 hours post-workout supports muscle recovery, but total daily protein intake matters more than precise timing. If you ate a protein-rich meal 2–3 hours before training, you have a larger window. Focus on hitting your daily total across well-spaced meals.
Body recomposition means losing fat and building muscle simultaneously. It requires a high protein intake (2.0–2.8g/kg), strength training, and eating at or slightly below maintenance calories. It's most effective for beginners, those returning to training, and people with higher body fat. The elevated protein supports muscle growth even in a slight deficit.
This calculator uses evidence-based multipliers from peer-reviewed research (ISSN, ACSM, ESPEN) tailored to your goal, activity level, and body weight. It also adjusts for age (elderly needs) and can use lean body mass if body fat % is provided. While individual needs can vary based on genetics and training status, the recommendations align with current sports nutrition science.
Count protein from all food sources. While foods like chicken, fish, eggs, and protein powder are the most protein-dense, grains, vegetables, and nuts also contribute. A cup of cooked rice has ~4g, a slice of bread ~3g, and a cup of broccoli ~3g. These 'incidental' proteins add up across the day and count toward your total.
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