Protein Per Day to Build Muscle (Calculator)

If you weigh 70 kg and want to build muscle, aim for about 112 to 154 grams of protein per day — 1.6 to 2.2 grams per kilogram of body weight. That range comes from research on trained lifters and sits well above the 0.8 g/kg minimum. Below: your number, worked examples, and how to hit it with real food.

Why the RDA Is Not Enough for Muscle Building

The recommended dietary allowance (RDA) for protein is 0.8 grams per kilogram of body weight per day. For a 70 kg person, that is 56 grams. But the RDA is designed to prevent deficiency in mostly sedentary adults — it is a floor, not a target. Building muscle is a different job: every training session creates tiny amounts of muscle damage, and your body needs amino acids from protein to repair that damage and add new muscle tissue. If you only eat the minimum, repair happens slowly and growth stalls.

Research on resistance-trained people points to a sweet spot of 1.6 to 2.2 grams of protein per kilogram of body weight per day. Below 1.6 g/kg, most people leave muscle gains on the table. Above 2.2 g/kg, extra protein gives little to no additional benefit for muscle growth in healthy adults.

Try the free Protein Intake Calculator to get your exact number in seconds — just enter your weight and your goal.

How Much Protein You Need: Worked Examples

The formula is straightforward: your body weight in kilograms multiplied by 1.6 gives the lower end of the range, and multiplied by 2.2 gives the upper end. If you think in pounds, divide your weight in pounds by 2.2 first to get kilograms.

Example 1 — a 70 kg man building muscle: 70 × 1.6 = 112 g per day at the lower end, and 70 × 2.2 = 154 g at the upper end. A sensible starting target is around 130 g per day, right in the middle.

Example 2 — an 85 kg lifter: 85 × 1.6 = 136 g, and 85 × 2.2 = 187 g. He should aim for roughly 140 to 185 g per day.

Example 3 — a 60 kg woman building muscle: 60 × 1.6 = 96 g, and 60 × 2.2 = 132 g. Her target is about 100 to 130 g per day.

The numbers scale with body weight, not gender — what matters is weight, training volume and goal.

Protein Needs by Goal (at 70 kg)

Your ideal intake depends on what you are trying to do. This table shows daily targets for a 70 kg person at each goal:

Fat loss deserves the higher end of the range. When you eat fewer calories than you burn, your body is more likely to break down muscle for energy — a higher protein intake protects the muscle you already have while the fat comes off.

Is 100 Grams of Protein a Day Enough?

It depends on your weight. For a 60 kg person, 100 grams equals about 1.7 g/kg — right inside the muscle-building range, so yes, it is enough. For a 70 kg person, 100 grams is 1.4 g/kg — slightly below the optimal range, but still far better than the 56 g minimum, and close enough that a small bump to 115–130 g would finish the job. For a 90 kg lifter, though, 100 grams is only 1.1 g/kg — clearly too little for serious muscle gain.

So instead of asking whether 100 grams is "enough" in general, divide it by your weight in kilograms. If the answer is 1.6 or higher, you are in the right zone. If it is under 1.4, add another protein-rich meal or a snack.

How Much Protein Should a Woman Eat Per Day?

Women building muscle need the same 1.6–2.2 g/kg as men. The confusion comes from the fact that women often weigh less, so their gram totals look smaller — but the per-kilogram rule is identical. A 55 kg woman training hard needs about 88–121 g per day; a 65 kg woman needs about 104–143 g.

Many women under-eat protein without realising it, especially if breakfast is toast and coffee and lunch is a salad with little protein. Spreading protein across three meals plus a snack makes the target much easier: for example, eggs at breakfast (12 g), chicken at lunch (35 g), Greek yogurt in the afternoon (15 g), and salmon at dinner (35 g) adds up to about 97 g before any extras.

How to Split Protein Across the Day

Total daily protein matters most, but spreading it out helps. Muscle protein synthesis — the process that builds new muscle — switches on after each protein-containing meal, and it responds best to doses of roughly 0.3–0.4 g/kg per meal. For a 70 kg person, that is about 25–30 g of protein per meal, three or four times a day.

Eating all your protein in one giant dinner is less effective, because a single meal can only trigger so much muscle building at once. A practical pattern looks like this for a 130 g target:

• Breakfast: 3 eggs with toast — about 20 g
• Lunch: chicken breast sandwich — about 35 g
• Snack: Greek yogurt with berries — about 15 g
• Dinner: salmon with rice and vegetables — about 35 g
• Evening: a glass of milk or a small whey shake — about 25 g

That adds up to 130 g without any single meal feeling extreme.

Best Protein Sources (and How Much They Give You)

Animal foods are the easiest route because they are protein-dense and contain all nine essential amino acids; plant foods work too, in larger portions or mixed. Here is what common foods deliver:

• Chicken breast: about 31 g protein per 100 g
• Greek yogurt: about 10 g per 100 g
• Eggs: about 6 g per egg
• Canned tuna: about 23 g per 100 g
• Lentils (cooked): about 9 g per 100 g
• Tofu: about 8 g per 100 g
• Whey protein powder: about 20–25 g per scoop
• Milk: about 8 g per 250 ml glass

If you eat mostly plant-based, combine sources through the day — beans with rice, lentils with bread, tofu with quinoa — to cover all essential amino acids.

Common Mistakes to Avoid

Eating too little on rest days. Muscle repair continues for 24–48 hours after training, so your protein target stays the same on rest days. Dropping protein just because you did not train slows recovery.

Counting only the main meal. Many people eat 50 g at dinner and almost nothing at breakfast and lunch. The total might look fine on paper, but the uneven spread wastes much of the benefit.

Assuming more is always better. Beyond about 2.2 g/kg per day, extra protein does not build extra muscle — it just gets used as expensive energy. Spend those calories on carbs instead, which fuel your training.

Forgetting total calories. Protein alone cannot build muscle if you are eating far too little overall. Muscle growth needs a small calorie surplus (or at least maintenance calories) plus progressive training. Protein is the building material; calories are the energy to do the building.

One note on safety: high protein intakes are fine for healthy kidneys, according to the research, but if you have kidney disease or another medical condition, check with your doctor before changing your diet. This guide is general information, not medical advice.

Frequently Asked Questions

Is 100g of protein a day enough to build muscle?

It depends on your weight: 100 grams is enough for a 60 kg person, since that is about 1.7 g/kg, but a 70 kg person needs around 112–154 g, and a 90 kg lifter needs 144–198 g. Divide your daily grams by your weight in kilograms — if the result is 1.6 or higher, you are in the muscle-building range.

How much protein should a woman eat per day to build muscle?

A woman building muscle needs the same 1.6–2.2 grams per kilogram of body weight as a man. For example, a 60 kg woman should aim for about 96–132 g per day, spread across three or four meals of roughly 25–30 g each.

Can I eat all my protein in one meal?

You can, but it is less effective: muscle building responds best to doses of about 0.3–0.4 g/kg per meal, so spreading your protein across three or four meals triggers muscle protein synthesis several times a day instead of just once.

Do I need protein powder to build muscle?

No. Protein powder is a convenience, not a requirement — whole foods like chicken, eggs, fish, yogurt and lentils can cover your full target. A shake simply helps on busy days or when a meal is short on protein.