How much protein do you need per day: how to calculate your intake based on your weight and goal

Protein is one of the three macronutrients that sparks the most debate: some people eat chicken breast five times a day, while others never think about it at all. Between these extremes lies your personal intake, which depends on your weight, goal and activity level. In this article we will break down how much protein you need per day specifically for you and show you a simple calculation formula.

Why your body needs protein and what happens when you don't get enough

Protein is not just "food for athletes." It is literally the building material that makes up most of your body: muscle fibres, internal organs, skin, hair and nails. In addition, protein is the basis of enzymes that trigger thousands of biochemical reactions, and of hormones that regulate metabolism, growth and mood.

Protein plays a role in oxygen transport: haemoglobin, which carries oxygen through the blood, is a protein molecule. Immune antibodies that protect you from viruses and bacteria are also built from amino acids. When you sustain an injury or simply train intensely, protein is essential for repairing damaged tissue.

What happens with chronic protein deficiency? The body starts "breaking down" muscle to support critically important functions — the heart, brain and immune system. The result is loss of muscle mass, persistent fatigue, frequent illness and deteriorating skin and hair. This is precisely why people on strict low-protein diets lose not only fat but also muscle — and end up slowing their metabolism.

There is another important argument in favour of protein for weight management: it provides lasting satiety. Compared with carbohydrates and fats, protein suppresses hunger more strongly because it influences the levels of the satiety hormones leptin and ghrelin. This makes it a key tool for anyone who wants to eat less without feeling hungry.

The baseline protein intake: what the key reference points say

The official minimum recommendation from the WHO is approximately 0.8 g of protein per kilogram of body weight per day for adults. This is the so-called "recommended daily allowance" (RDA), which the organisation defines as the minimum level to prevent deficiency in most people.

It is important to understand: this is not the optimum — it is the lower boundary. This figure is calculated for a person with a sedentary lifestyle who simply wants to avoid harming their health. It does not account for training, weight loss, muscle gain or recovery from illness.

Most modern sports and nutrition organisations recommend significantly higher values. A meta-analysis published in the British Journal of Sports Medicine in 2018 showed that for muscle growth in people who train, the optimal range is 1.62–2.2 g/kg per day. The scientific committee of the European Food Safety Authority (EFSA) also points to a range of 1.2–2.0 g/kg for physically active people in its recommendations.

The key takeaway: the daily protein norm is not a fixed number but a range — a starting point for a personal calculation. The higher your activity level and the more ambitious your goal, the closer to the upper boundary you should aim. For more on how protein fits into the overall balance of macronutrients, read the article What CPDFC means in plain language: calories, protein, fats and carbohydrates — explained from scratch.

How to calculate your protein intake by weight: a step-by-step formula

Calculating your daily protein requirement is simpler than it seems. You need three steps:

Step 1. Determine your current weight in kilograms. Weigh yourself in the morning on an empty stomach for the most accurate result.

Step 2. Choose a coefficient based on your goal (detailed values are in the next section). The range is 0.8 to 2.2 g/kg.

Step 3. Multiply your weight by the coefficient — the result is your daily target in grams.

Calculation example:

• Weight: 70 kg
• Goal: muscle gain, training 4 times per week
• Coefficient: 1.8 g/kg
• Result: 70 × 1.8 = 126 g of protein per day

An important nuance: if you are overweight, it is better to base the calculation on your target weight rather than your actual weight. Otherwise the norm will be overstated and will not correspond to the real needs of your muscle tissue. For example, if your actual weight is 95 kg and your target weight is 75 kg, calculate your norm from 75 kg.

To understand how to fit your protein norm into the overall picture of your nutrition, we recommend reading the article The norm for protein, fats and carbohydrates: how to calculate your macros for your goal.

Protein intake for different goals: weight loss, maintenance, muscle gain

Your goal is the main factor determining your coefficient. Here are specific reference points:

Weight loss — 1.6–2.0 g/kg

When in a calorie deficit, the body tends to "burn" not only fat but also muscle. High protein intake is the primary tool to prevent this. Studies published in the American Journal of Clinical Nutrition show that a high-protein diet during weight loss preserves muscle mass significantly better than a standard diet. An additional bonus: protein increases thermogenesis — the body spends more energy digesting it than it does digesting fats or carbohydrates.

Maintaining shape — 1.2–1.6 g/kg

If you are neither losing nor gaining weight and simply want to stay in shape with moderate activity, this range is sufficient to maintain muscle mass and overall wellbeing.

Muscle gain — 1.6–2.2 g/kg

For muscle tissue growth, building material is needed — amino acids that come from protein. Strength athletes and those working on definition can use the upper end of the range. That said, protein is not the only factor: total calorie intake, training programme and recovery all matter.

Remember: the coefficient gives you a guideline, not an absolute figure. Start in the middle of the range and adjust based on how you feel and the results you see.

For information on how to track a calorie deficit alongside your protein norm, see the article Calorie deficit for weight loss: how to calculate a safe minus without harming your health.

Protein and physical activity: how your training level changes your needs

Activity level is the second most important factor after your goal. The more intensely you train, the more micro-damage your muscle fibres sustain and the more protein is needed for their repair and growth.

Here are approximate norms by activity level:

• Sedentary lifestyle, minimal movement: 0.8–1.2 g/kg — the basic minimum per WHO recommendations
• Moderate activity, 3–4 training sessions per week: 1.4–1.8 g/kg
• Intense training, 5 or more times per week: 1.8–2.2 g/kg

Timing is also worth mentioning. After a strength training session, muscle protein synthesis is elevated for 24–48 hours — according to the Journal of the International Society of Sports Nutrition. During this period it is especially important not to skip protein meals. You do not need to eat immediately after training, but your total daily protein amount should be met.

Cardio workouts — running, cycling, swimming — also increase protein requirements, although to a lesser extent than strength training. During long cardio sessions (from 60 minutes onwards), the body begins to use muscle amino acids as an additional energy source.

If you are just starting to learn about tracking nutrients, the article Calorie counting for beginners: where to start so you don't quit on day two will help you build a system from scratch.

Special cases: pregnancy, older age and vegetarianism

Standard formulas work for most healthy adults, but there are groups that need a special approach.

Pregnancy. During this period the need for protein increases, especially in the second and third trimesters — protein is essential for the development of the foetus, the placenta and changes in the mother's body. The exact norm should be agreed with your attending physician or dietitian, as it depends on individual indicators.

Older age (60+). With age the body absorbs protein less efficiently and loses muscle mass more quickly — a phenomenon known as sarcopenia. The European Society for Clinical Nutrition and Metabolism (ESPEN) recommends that older people consume at least 1.2–1.5 g/kg per day to prevent muscle wasting. This is especially important for maintaining independence and reducing the risk of falls.

Vegetarianism and veganism. Plant-based proteins are generally incomplete: they lack one or more essential amino acids. The solution is to combine sources throughout the day: legumes + grains, tofu + sesame, lentils + rice. Vegans are advised to aim for the upper boundary of their range to compensate for the lower digestibility of plant protein.

Kidney disease. In chronic kidney disease, the protein norm may be significantly reduced — sometimes to as low as 0.6 g/kg. This is the one situation in which a high-protein diet is contraindicated. Any adjustments to the protein norm in cases of kidney disease must be agreed with a nephrologist.

FAQ: common questions about daily protein intake

Can you eat too much protein? Is it harmful?

For healthy adults with normal kidney function, intakes of up to 2.2–2.5 g/kg per day are considered safe. The body does not store excess protein in muscles — the surplus is used as energy or excreted. However, consistently exceeding the norm without need provides no additional benefit and increases the load on the kidneys, so stick to the recommended ranges.

Do you need to eat protein after every workout?

A strict "protein window" of 30 minutes after training does not exist — this is a myth that has been debunked by a number of studies. What matters more is meeting your daily protein norm by spreading it evenly across 3–5 meals. Each meal should contain 20–40 g of protein for optimal stimulation of muscle protein synthesis.

How can you easily track protein in your diet if you don't have time to count manually?

The most practical approach is to use an app with a food database. MICO — an AI calorie-counting app (mico.fit) — lets you log food in three ways: photograph a dish, say it aloud, or type it in. The app automatically calculates macros including protein and shows how much you have left to reach your norm. A waiting list is currently open — participants will receive free early access at launch. For more on keeping a food diary, read the article How to keep a food diary: a step-by-step guide for beginners.

Which is better: animal or plant protein?

Animal protein (meat, fish, eggs, dairy products) contains a complete set of essential amino acids and is better absorbed. Plant protein is absorbed less efficiently, but with smart combining of sources it can fully cover your needs. The optimal approach is to combine both types or, if you are vegan, to diversify your plant-based sources carefully.

Do I need to increase protein if I am losing weight slowly?

Not necessarily. The rate of weight loss is determined primarily by the calorie deficit, not by the amount of protein. If your weight has stalled, the cause is most often inaccurate calorie counting or metabolic adaptation. For more on this, see the article Why your weight stalls on a calorie deficit: 7 real reasons and what to do about it.

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