Protein Calculator: How Many Grams Per Day for Your Goal

A protein calculator tells you how many grams per day you need based on your body weight and goal. It's probably the highest-impact-for-effort nutrition number: adjusting protein is the first thing any sports nutritionist does before touching anything else. If you train for strength and eat too little protein, you won't progress; if you're in a deficit and don't hit the minimum, you lose muscle. The other macros (carbs, fats) are relatively flexible. Protein isn't.

In this guide, you'll see evidence-based recommended ranges (ISSN, EFSA, recent meta-analyses), how to spread those grams through the day, which protein sources to prioritize, and the most common myths about excess intake (kidneys, liver, 'capped' hypertrophy).

How much protein per day: ranges by goal

Example. An 80 kg man who trains strength 4 days a week and wants hypertrophy: 80 × 1.8 = 144 g of protein per day. A 60 kg woman on an aggressive cut: 60 × 2.2 = 132 g/day. A 70 kg sedentary person with no medical conditions: 70 × 0.9 = 63 g/day.

Per-meal split: how much in each meal

Muscle protein synthesis (MPS) responds to a per-meal threshold: below 20 g of quality protein the response is submaximal; above 40 g, the extra response plateaus. The sweet spot for most adults is 20-40 g of protein every 3-5 hours.

That translates to 3-5 meals with 25-40 g each. Packing 150 g of protein into one meal is suboptimal; splitting it into 4 meals of 35-40 g maximizes MPS throughout the day.

Best protein sources

Protein myths

Does too much protein damage the kidneys?

False in healthy people. Reviews (Antonio et al. 2016, Devries et al. 2018) show intakes up to 3.4 g/kg for months don't affect kidney function in adults without underlying conditions. Caution applies if you already have diagnosed chronic kidney disease: in that case consult a nephrologist, not the internet.

What about the liver?

There's also no evidence of liver damage from dietary protein in healthy people. The liver is only affected if there's underlying pathology (hepatitis, cirrhosis), not by protein amount in a normal diet.

Does a protein stack (whey + casein + egg + meat) make sense?

Marketing. The only things that matter are your daily total, sufficient biological quality, and a reasonable split. If you hit 1.6-2.2 g/kg with chicken, eggs, dairy, and/or legumes, you don't need expensive 'stacks'.

More protein = more muscle?

Only up to the 1.6-1.8 g/kg threshold in people who train. Beyond that the curve flattens: adding more protein doesn't add more muscle, just more cost and more satiety (sometimes a problem if you're trying to bulk).

Common mistakes when calculating protein

• Using actual weight in people with significant overweight: use target weight or estimated lean mass so you don't inflate the number.
• Forgetting the 'hidden' protein in carbs: 100 g of oats have 13 g of protein, 100 g of whole-grain bread has 9 g. It adds up fast.
• Centering the day on one massive meal: split into 3-5 meals to maximize protein synthesis.
• Cutting protein when you cut calories: it's exactly the opposite; in a deficit, protein goes up, not down.

Calculate your protein now

Our free online protein calculator gives you total grams and per-meal amounts based on your weight and goal (sedentary, hypertrophy, cutting, or elite). Then, if you want to know how to hit that number with real food, check the protein equivalents table: how much chicken, tuna, tofu, or whey you need to cover 30 g per meal.