Nutrition

How Much Protein Do You Need a Day? (By Weight & Goal)

Q: Do I need protein right after a workout?

The 'anabolic window' is wider than once believed. Total daily protein matters far more than timing. Having protein within a few hours before or after training is sufficient — no need to chug a shake in the locker room.

From couch potato to muscle building — your exact daily protein target in grams, explained simply.

📅 Oct 2, 2026 ⏱️ 8 min read ✍️ CalcFitly Team

How much protein do you need a day - by body weight and fitness goal

In this guide: Why protein matters so much The simple g/kg formula Protein needs by body weight What 100 g of protein looks like Does protein timing matter? FAQs

Protein is the one nutrient everyone argues about. Your gym buddy says you need 200 grams. Official guidelines say 50. Who's right? Both — for different people. Let's find your number. 💪

Why Protein Matters So Much

Protein isn't just for bodybuilders. It's the building material for:

💪 Muscle: Repair and growth after every workout (and every daily movement)
🦴 Bones, skin, hair: All made largely of protein
🛡️ Immune system: Antibodies are proteins
⚖️ Hunger control: Protein is the most filling macronutrient — a secret weapon for weight loss
🔥 Metabolism: Digesting protein burns more calories than carbs or fat (the thermic effect)

Eat too little, and your body quietly breaks down muscle to get what it needs — especially during weight loss.

The Simple g/kg Formula

Forget percentages. The easiest science-backed method uses your body weight:

Your Lifestyle	Protein Per kg Body Weight
🪑 Sedentary (official minimum)	0.8 g / kg
🚶 Active (regular exercise)	1.2 – 1.6 g / kg
🏋️ Muscle building	1.6 – 2.2 g / kg
📉 Weight loss (muscle protection)	1.2 – 1.6 g / kg
👴 Over 50 (muscle preservation)	1.0 – 1.2 g / kg

🧮 Quick Example: 70 kg Person

Sedentary: 70 × 0.8 = 56 g/day

Active: 70 × 1.4 = ~98 g/day

Building muscle: 70 × 1.8 = ~126 g/day

✅ Same body, three goals — protein triples from minimum to muscle building.

Get Your Exact Protein Target ⚡

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Protein Needs by Body Weight

Quick reference for the muscle-building range (1.6–2.2 g/kg):

Body Weight	Minimum (0.8 g/kg)	Muscle Building (1.6–2.2 g/kg)
50 kg	40 g	80 – 110 g
60 kg	48 g	96 – 132 g
70 kg	56 g	112 – 154 g
80 kg	64 g	128 – 176 g
90 kg	72 g	144 – 198 g

Wondering where to get all that protein? Check our complete list of high-protein foods with exact amounts per serving — from chicken breast to budget-friendly dal.

What 100 g of Protein Looks Like

Numbers on paper are easy — plates are harder. Here's roughly how common foods stack up:

Food	Serving	Protein
🍗 Chicken breast	100 g cooked	~31 g
🥚 Eggs	2 large	~12 g
🐟 Fish (salmon/tuna)	100 g	~22–25 g
🧀 Paneer	100 g	~18 g
🥣 Greek yogurt	170 g	~17 g
🫘 Lentils (dal)	1 cup cooked	~18 g
🥜 Peanuts	30 g handful	~8 g

Vegetarian? Totally doable — combine dal, paneer, yogurt, tofu, chickpeas, and eggs across the day. Aim ~10% higher than the table since plant proteins digest slightly less efficiently. And remember: protein fits inside your daily calorie budget — our macro calculator balances all three macros for you.

Does Protein Timing Matter?

Good news: the famous "30-minute anabolic window" is mostly gym mythology. Research shows:

📊 Total daily intake matters most — hitting your grams beats perfect timing
🍽️ Spread it out: 25–40 g per meal across 3–4 meals beats one giant protein bomb
⏰ Post-workout window is hours wide — eating within 2–3 hours of training is plenty

So relax — no need to sprint to your shaker bottle mid-workout. 😄

The Bottom Line

Minimum to survive: 0.8 g/kg. To thrive, stay full, and build muscle: 1.2–2.2 g/kg depending on your goal. Calculate your number, hit it daily with foods you enjoy, and let consistency do the rest. 💚

⚠️ A quick note: People with kidney disease should follow their doctor's protein limits. For healthy adults, intakes up to 2.2 g/kg are considered safe in current research.

Frequently Asked Questions

For muscle building, aim for 1.6 to 2.2 grams of protein per kg of body weight daily, combined with strength training. A 75 kg person needs roughly 120–165 g per day. More than 2.2 g/kg shows no extra benefit in research.

It depends on your weight. For someone around 60–70 kg, 100 g covers most goals including muscle building. For a 90 kg person, 100 g only meets the basic minimum — they'd need 145–200 g for muscle growth. Always calculate from your body weight.

For healthy people, intakes up to 2.2 g/kg are well-tolerated. Beyond that, extra protein is simply converted to energy or fat. People with kidney disease should follow their doctor's limits, but healthy kidneys handle high-protein diets fine according to current research.

The "anabolic window" is wider than once believed. Total daily protein matters far more than timing. Having protein within a few hours before or after training is sufficient — no need to chug a shake in the locker room.

Combine lentils, chickpeas, beans, paneer, tofu, Greek yogurt, eggs, nuts, and whole grains across the day. Vegetarians should aim slightly higher (add ~10%) since plant proteins digest a bit less efficiently. Variety across meals covers all essential amino acids.

Yes — protein is the most filling macronutrient and protects muscle during weight loss. Studies show higher-protein diets (1.2–1.6 g/kg) reduce hunger and preserve metabolism in a calorie deficit, making fat loss easier to sustain.