Protein Calculator: How much protein do you need per day?
It feels like everyone has an opinion on how much protein you should eat these days.
One headline says a high protein diet is essential for weight loss and muscle growth.
Another warns that too much protein could harm your health.
Protein calculator
Find out how much protein you actually need each day.
Some plans push daily protein shakes and bars, while others say most people need far less protein than they think.
So what’s actually true? How much daily protein intake do healthy adults really need for optimal health, and how does that change if your goal is to lose fat, build muscle, or simply maintain muscle mass muscle mass ?
The answer depends on more than internet trends.
Your body weight, activity level, lean body mass, and overall health and fitness goals all influence your protein requirements. That’s why a one-size-fits-all number rarely works — and why using a protein calculator can be far more helpful than following generic advice.
That’s where our protein calculator comes in. It estimates your daily protein intake using your body weight, age, activity level, and fitness goals, and shows how to use those numbers in real life to help you meet your protein needs without guesswork.
Protein calculator
How this protein calculator works
At its core, the calculator takes your individual data — including body weight, activity level, age, and fitness goal — and transforms it into a clear range of grams of protein to aim for.
Why is this important?
Because protein requirements are as individual as we are.[1] A sedentary adult who wants to maintain muscle, for instance, won’t need the same amount as someone who is highly physically active and focused on muscle gain.
Here’s what the calculator considers:
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Body weight: Protein needs are linked to your body size because muscle mass and body tissue require amino acids to repair, grow, and maintain.[2]
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Activity level: Your physical activity drives your protein requirements. More exercise means more muscle protein synthesis muscle protein synthesis , so your protein intake needs to rise accordingly.[2]
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Fitness goals: Are you looking to lose fat, build muscle, or simply maintain your current weight? Each goal shifts your optimal daily protein range.[3]
Calculation methods explained
Our calculator generates results using two scientifically-backed methods, giving you a well-rounded perspective on your protein needs.
Method #1. Protein per kilogram of body weight
This method calculates protein needs by multiplying your body weight by the recommended grams of protein per kilogram (g/kg) depending on your activity and goals. It’s grounded in recommended dietary allowances (RDA) and sports nutrition guidelines, like these:
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Standard protein RDA: 0.8 g/kg.[1] This is currently the recommended amount of protein for healthy adults to meet basic nutritional requirements and support normal body tissue repair in the US, (although the new US Dietary Guidelines 2025-2030 recommend an increase to 1.2g-1.6g /kg).
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RDA for active individuals: 1.2–1.6 g/kg.[4] Active individuals usually require more protein than the baseline of 0.8 g/kg. This higher amount supports muscle maintenance, recovery, and protein synthesis during moderate exercise.
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RDA for muscle gain: 1.6–2.2 g/kg.[4] This is optimal for building muscle, enhancing lean body mass, and maximizing muscle protein synthesis during resistance training.
In people living with obesity (commonly BMI ≥30 kg/m²), some clinical nutrition guidelines and dietetic practice use adjusted or ideal body weight when estimating protein requirements, particularly in higher BMI categories, to avoid overestimation. However, this is individualised and depends on clinical context and should be assessed by a Registered Dietitian.
Pros of method #1
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Straightforward and easy to calculate.
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Provides a reliable baseline for daily protein intake.
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Suitable for most healthy adults.
Cons of method #1
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Does not fully account for intensity or type of physical activity.
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May underestimate needs for highly physically active people or those with ambitious muscle gain or weight loss goals.
This method is ideal if you want a quick, science-backed estimate of grams of protein based on your body weight without diving into detailed multipliers or activity adjustments.
Method #2. Activity & goal-based calculation
This method offers a more tailored approach, factoring in your physical activity, body composition body composition goals, and desired outcomes. It recognizes that protein needs aren’t just about weight — they’re also about how active you are, the intensity of your exercise program, and whether you want to lose fat, maintain muscle, or build muscle.
It starts with your body weight and adjusts protein targets using these activity multipliers:
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Sedentary: minimal physical activity, desk-based lifestyle
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Lightly active: light exercise 1–3 days per week
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Moderately active: moderate exercise 3–5 days per week
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Very active: intense training 6–7 days per week
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Extra active: competitive athletes or physically demanding jobs
Then, your fitness goal is incorporated to fine-tune the amount of daily protein you need for optimal health, muscle protein synthesis, and performance, like this:
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Weight loss: higher protein intake, to support muscle preservation while promoting fat loss [5]
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Maintenance: moderate intake, to sustain lean body mass and energy
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Muscle gain: higher protein to help fuel muscle growth, resistance exercise, and overall muscle protein synthesis [4]
Pros of method #2
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Gives a more personalized protein recommendation.
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Links protein intake with body composition goals and exercise programs.
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Supports muscle protein synthesis across different fitness levels.
Cons of method #2
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More complex than the weight-based method.
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Not suitable for some populations, including:
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Individuals with kidney disease.
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Those living with extreme obesity or very low body weight.
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Other medical conditions that limit protein intake.
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By combining both methods, the protein calculator provides a balanced range that reflects both scientific recommendations and individual variation. This ensures you’re consuming adequate protein for your health and fitness goals without the guesswork.
In short, this isn’t just a number — it’s a roadmap for healthy eating, smart protein intake, and achieving your fitness goals while keeping your body composition in check. You can finally know if you’re eating enough protein to maintain muscle, build muscle, or lose fat safely and effectively.
Protein needs by goal
Protein is more than just a nutrient — it’s the foundation for muscle protein synthesis, body tissue repair, and maintenance of lean body mass.[4]
But the amount of protein you need each day varies based on your fitness goals. Whether you want to lose weight, build muscle, or maintain your current body composition, shooting for the right daily protein intake is helpful for optimal health and results.
Protein intake for weight loss
When your goal is weight loss, protein becomes a key ally.[5] Eating enough protein, alongside resistance training, can help to preserve muscle mass while you lose body fat. That’s important because losing muscle can slow down your basal metabolic rate and make fat loss harder.
Higher protein intake also supports satiety, meaning you feel fuller longer,[3] which helps you stay on track with your eating plan and daily calorie goals. Additionally, resistance exercise paired with higher protein intake amplifies muscle protein synthesis,[4] helping you preserve muscle mass even during a calorie deficit calorie deficit .
Recommended range: 1.6–2.2 g/kg of body weight per day.
For example, a 70 kg (154 lb) person aiming to lose fat would need roughly 112–154 grams of protein per day.
Protein intake for muscle gain
If your goal is muscle gain, protein becomes even more important.
Amino acids, the building blocks of protein, are essential for repairing and growing muscle fibers after training. Without sufficient protein, even the best resistance exercise program will fail to produce meaningful muscle growth.[4]
Adequate protein intake can support muscle protein synthesis and the maintenance and development of lean body mass, when paired with resistance exercise.
To reach your protein targets, focus on high quality, high protein foods. And, if you’re highly physically active, make sure to get enough calories overall. Protein shakes (made from animal-based protein, like whey protein, or plant-based protein, like pea or hemp) can be a helpful addition to your diet, especially when travelling, on the go, or when wholefoods are not available.
Recommended range: 1.6–2.4 g/kg of body weight per day.
For example, a 75 kg (165 lb) person focused on building muscle would need approx 120–180 grams of protein daily.
Protein intake for maintenance
For those looking to maintain their current weight and muscle mass, a balanced protein approach is usually sufficient.
Maintaining lean body mass is important for strength and energy as well as for long-term metabolic health.[2] Adequate protein supports muscle protein synthesis and tissue repair.
Recommended range: 1.0–1.4 g/kg of body weight per day.
For example, a 60 kg (132 lb) person maintaining their body composition would need about 60–84 grams of protein daily.
How to use the calculator correctly
Using our protein calculator is simple, but getting accurate results requires careful input.
Small details — like your weight, activity level, and goal — directly influence your daily protein target.
Follow these three steps to make sure your recommendations are precise, personalized, and make it easier to reach your health and fitness goals.
#1. Enter your weight
When entering your body weight, you can use either metric (kilograms) or imperial (pounds) units, but accuracy is key.
Why it matters: Protein requirements are calculated per kg / lb of body weight. Even a small difference in your weight can change your daily protein intake by 5–10 grams or more. For example, if you’re aiming for muscle gain, underestimating your weight could mean you’re not consuming enough protein to fuel muscle protein synthesis, while overestimating could result in unnecessary excess calories.
Tip: If your weight fluctuates, use an average or the most recent measurement to get the best protein recommendation.
#2. Selecting your activity level
Next, choose your activity level.
Physical activity drives your protein requirements because the more you challenge your muscles, the more amino acids are needed for muscle repair and muscle growth. Selecting the right category ensures your protein intake supports your daily activity and exercise routine.
#3. Choose your goal
Finally, pick your goal: weight loss, maintenance, or muscle gain.
Your goal influences your protein intake. The body regulates protein metabolism differently depending on whether it is in a calorie deficit, maintenance or surplus, influencing whether protein is primarily used to preserve, maintain or build lean body tissue. Choosing the right goal ensures your daily protein intake is tailored to your fitness goals and helps you get results.
Tips for accurate daily protein planning
Knowing your daily protein target is only half the battle.
The way you spread your protein intake across meals, choose your sources, and adjust based on your activity and results can make a real difference in maintaining muscle, supporting recovery, and hitting your goals.
In real life, it’s easy to skip protein at breakfast, rely on snacks, and eat unevenly throughout the day, especially with busy schedules, work, and workouts. By building simple habits around timing, quality, and tracking, you can make your protein work as efficiently as possible without overcomplicating your day.
Tip #1. Distribute protein throughout the day
Spreading protein evenly across meals gives your body a consistent supply of amino acids, which supports muscle protein synthesis and helps preserve lean body mass.[4]
Aim for 20–40 grams per meal over 3–5 meals each day.[6]
For example, a 70 kg person trying to build muscle might aim for 30 grams at breakfast, 35 grams at lunch, 30 grams at dinner, and a smaller portion as a protein-rich snack or shake. This approach helps maximize muscle repair, improves recovery, and makes protein intake easier to fit into a busy lifestyle.
Tip #2. Choose high-quality protein sources
The type of protein you eat matters just as much as the amount.
Complete protein sources provide all essential amino acids, which are necessary for muscle repair and body tissue maintenance.
Animal-based options like fish, poultry, eggs, dairy, and lean meats naturally contain all essential amino acids. Plant-based sources can also provide a complete amino acid profile. High quality plant protein options include tofu, tempeh, seitian, edamame, quinoa and soya, and plant protein is also found in beans, lentils and nuts.
Including a mix of high-quality protein sources ensures your daily protein intake supports muscle growth, recovery, and overall health, even if you follow a plant-based diet. Protein shakes, protein bars, and whey protein can be convenient additions when life gets busy.
Tip #3. Track your progress
Keeping track of your results helps ensure your protein intake is supporting your goals.
Monitor things like recovery after workouts, energy levels, and changes in body composition or muscle mass. If you notice fatigue, stalled muscle growth, or difficulty preserving lean mass during weight loss, it could mean your protein intake is too low.
Tip #4. Adjust intake based on feedback
Protein requirements aren’t static — they change with activity, age, and results.
Use your tracking data to fine-tune your daily protein intake:
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Consider increasing protein if you’re not recovering well, struggling to build muscle, or losing lean body mass during weight loss.
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If you are gaining fat unexpectedly, it’s a sign you’re eating more calories than you need. Review your energy needs and macronutrient intake to align with your goals.
Adjusting based on real-world feedback ensures that your protein intake stays effective, sustainable, and aligned with your fitness goals without overloading your diet.
These tips make it easy to turn your protein intake recommendations from numbers on a page into practical, everyday habits that fit into your life.
Recommended protein sources
Meeting your daily protein needs isn’t just about numbers — it’s about choosing sources that work for you. That means considering what you enjoy, how much time you have to cook, whether you need meals on the go, and how much prep you’re willing to do.
Some people thrive on quick grab-and-go options like protein shakes, yogurt, or boiled eggs, while others enjoy cooking fresh meals with fish, chicken, or beans. The key is building an eating plan with protein sources that are realistic, convenient, and aligned with your goals so you can hit your daily protein intake without stress.
Animal-based protein sources
Animal proteins are complete proteins, which means they provide all the essential amino acids you need.
Practical options to match different lifestyles include:
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Fish. Salmon, tuna, cod, and mackerel are high in protein and healthy fats. Quick to cook or easy to add to salads for a fast meal.
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Poultry. Chicken and turkey are versatile and lean. Perfect for meal prep, stir-fries, or sandwiches on the go.
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Eggs. Whole eggs or egg whites are simple to cook or add to meals and snacks, requiring minimal prep.
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Dairy. Yogurt, milk, and cheese are convenient and portable, making it easy to reach your protein target even when busy.
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Lean meats. Beef, pork, and lamb offer quality protein. Opt for quick-cook cuts if time is tight.
For extra convenience, protein shakes, whey protein, or protein bars can be handy options to fill gaps in your intake, especially on hectic days or post-workout.
Plant-based protein sources
Plant proteins can also help you meet your daily protein needs, especially if you mix sources to get all eight essential amino acids. Plant-based protein sources are flexible, tasty, and often quick to prepare, making them great for both meal prep and on-the-go eating.
Some practical choices include:
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Beans. Black beans, kidney beans, and chickpeas are versatile, easy to cook in bulk, and can be added to salads, soups, or bowls.
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Tofu and tempeh. These soy-based proteins are easy to grill, stir-fry, or bake. Pre-marinated versions save time for busy schedules.
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Quinoa. A complete protein grain that cooks quickly and can be a base for meals or added to salads.
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Lentils. Cook in bulk for soups, stews, or grain bowls; they’re protein-rich and filling.
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Nuts and seeds. Almonds, peanuts, chia seeds, and hemp seeds make portable snacks or easy meal toppers.
By choosing protein sources that match your taste, lifestyle, and schedule, you can make your daily protein intake realistic, sustainable, and effective, helping you consistently consume adequate protein and stay on track with your muscle growth, fat loss, or maintenance goals.
Frequently asked questions
How much protein do I really need per day?
It depends on your body weight, activity level, and goal. The new U.S. Dietary Guidelines recommend protein levels of 1.2–1.6 g/kg for optimal health, an increase from 0.8 g/kg, but your ideal range is personal.
Why do experts recommend different protein ranges?
Because protein needs change based on activity, muscle mass, and goals. A sedentary person and an athlete won’t need the same amount.
How often should I recalculate my protein intake?
Any time your weight, activity level, or goal changes — or every few months to stay aligned with your progress.
Is a high-protein diet safe for everyone?
For most healthy people, yes. The new U.S. Dietary Guidelines recommend protein levels of 1.2–1.6 g/kg for optimal health, an increase from 0.8 g/kg. But if you have kidney issues or medical conditions, check with a healthcare professional first. People with pre-existing kidney disease may need to monitor protein intake more carefully, as high protein diets can put the kidneys under more stress.
How much protein can the body absorb at once?
Your body absorbs all the protein you eat, but muscle protein synthesis may plateau around 20–40 g per meal. For optimal muscle building, space your protein intake evenly throughout the day, aiming for 20–40g per meal.
Do athletes require more protein?
Yes. Sedentary individuals need a minimum of 0.8 g/kg of protein to prevent deficiency, but athletes may require protein intakes of 1.2-1.6+ g/kg due to higher intensity and duration of exercise. Higher training demands increase protein needs to support recovery, performance, and muscle repair.
Can you build muscle on a plant-based diet?
Absolutely. While plant-based protein sources can contain less protein in a given serving compared to animal sources, as long as you eat enough total protein, get all the essential amino acids, and strength train regularly, you can build muscle.
How do I calculate my daily protein?
Multiply your body weight by your target range (e.g. 1.2–2.2 g/kg), or use our calculator for a more personalized estimate. Alternatively, protein intake can be aimed at 10% to 35% of total daily calories.
Is 100 g of protein a day too much?
For many people, it’s completely reasonable. Whether it’s “too much” depends on your body weight and goals. Excessive protein intake can crowd out other essential nutrients in the diet, making it harder to achieve a balanced diet, so be aware of your overall mix of carbs, protein, fat, and veggies.
How much protein for weight loss?
Aim for around 1.6–2.2 g/kg to help preserve muscle and keep you feeling full during a calorie deficit.
How much protein for a 160 lbs female?
Roughly 75–130 g per day, depending on activity level and goals like fat loss, maintenance, or muscle gain. Personal factors, like pregnancy and age, also increase protein requirements.
