How Much Protein Do I Need a Day?

Where 1.6 g/kg comes from

Three numbers come up in every protein discussion, and they answer different questions.

The 1.6 figure comes from Morton and colleagues (2018), who pooled 49 trials of people lifting weights while taking extra protein. Gains in lean mass rose with protein intake up to about 1.62 g/kg a day and flattened after that. Their statistical uncertainty ran up to 2.2 g/kg, which is why that number is the sensible ceiling. The International Society of Sports Nutrition lands in the same place: 1.4 to 2.0 g/kg a day for most people who train.

The gym rule of "1 gram per pound" is that 2.2 g/kg ceiling. It works, it is just more than most people need. If you eat that way comfortably, keep it; if you keep falling short, 0.7 g/lb gets you nearly all of the benefit.

Work out your number in three steps

The chart covers most people. If you are between rows or want an exact figure, this is the whole calculation.

1. Get your weight in kilograms. Pounds divided by 2.2. A 165 lb person weighs 75 kg.
2. Multiply by the number for your situation from the table below. At 1.6, 75 kg gives 120 g a day. If you prefer pounds, multiply your weight in pounds by 0.7 instead: 165 × 0.7 is 115 g. The two methods differ by a few grams, which does not matter.
3. Divide by the number of meals you actually eat. 120 g over four meals is 30 g each; over three meals it is 40 g each.

Round the result to the nearest 5 g and write it at the top of your food notes or your training log. A number you remember is a number you hit.

Three worked examples

A 75 kg (165 lb) man on a beginner plan, eating at maintenance. 75 × 1.6 = 120 g a day. Four meals of 30 g. That is 480 calories of protein (4 calories per gram), a fifth of a 2,400-calorie day.

A 60 kg (132 lb) woman lifting three days a week. 60 × 1.6 = 96 g, call it 95 g. Three meals of 25 g give 75 g, so one snack of about 20 g closes the gap. Snacks ranked by protein per calorie makes that easy to pick.

An 85 kg (187 lb) lifter in a deficit. 85 × 2.0 = 170 g a day. On 2,200 calories that is 680 calories from protein, about 31% of the day. The higher figure protects muscle while calories are short.

How to split it across the day

The daily total does most of the work. Distribution is the second lever.

• About 0.4 g/kg per meal, three to five times a day. That is the per-meal figure Schoenfeld and Aragon proposed in 2018; four meals of it make 1.6 g/kg. For most adults, 25 to 40 g per meal.
• Three to five hours between protein meals. Breakfast at 8, lunch at 12:30, a snack at 4 and dinner at 7:30 does it without planning.
• Fix the smallest meal first. Usually breakfast, often 10 to 15 g, with dinner carrying half the day. Moving 20 g from dinner to breakfast keeps the total and gives you four useful meals instead of two. Breakfasts with 30 to 44 g of protein lists portions that get there.

Here is a 120 g day laid out by meal. The foods are placeholders; what to put on the plate is on what 100 g of protein looks like.

Is there a limit per meal? The claim that your body can only "use" 30 g at a time is wrong. A 2023 study by Trommelen and colleagues gave lifters 25 g or 100 g after training, and the larger dose kept muscle building going for longer. Bigger meals are not wasted; spreading protein out is simply the easier way to reach the total.

Do you need protein right after training? Not within minutes. A 2013 meta-analysis by Schoenfeld, Aragon and Krieger found that once daily protein was matched, timing made little difference. A protein meal within a few hours either side of training covers it. What to eat before the gym has the timing table for the meal before.

Cutting: why the number goes up

In a calorie deficit your body is more willing to break down muscle for energy. Two things push back: keep lifting heavy, with the same loads you used before the diet, and eat more protein. Reviews of lean lifters dieting, including Helms and colleagues (2014), support intakes toward the top of the range while cutting, so 1.8 to 2.2 g/kg of bodyweight is the working number.

It also helps the diet itself: protein is the most filling macronutrient, and roughly a fifth to a quarter of its calories are spent digesting it. Neither effect replaces a sensible deficit, but both make one easier to hold.

The practical problem is fitting 170 g of protein into fewer calories, which is a food-choice job: the list of high-protein, low-calorie foods ranked per 100 kcal sorts them. Keep the deficit modest, roughly 300 to 500 calories a day; bigger cuts make muscle harder to keep and training harder to progress. If you are trying to lose fat and gain muscle at the same time, body recomposition covers how protein, calories and training fit together.

Over 50: same target, bigger meals

Older muscle responds less to a small dose of protein, a change researchers call anabolic resistance. Two adjustments follow from it.

• Raise the daily floor. The PROT-AGE study group recommended 1.0 to 1.2 g/kg a day for healthy adults over 65, and at least 1.2 g/kg for those who exercise. If you lift, keep the same 1.6 g/kg target as younger lifters and treat 1.2 g/kg as the floor you do not drop below.
• Make each meal count. A 15 g breakfast does less for muscle at age 60 than at age 25. Aim for at least 25 to 30 g in each of three meals rather than a large dinner and two small meals.

The training matters as much as the food: protein without lifting does little for muscle. Strength training for women over 50 has the plan this target is meant to support. If you have kidney disease, diabetes with kidney involvement or have been told to limit protein, check your target with your doctor before raising it.

If you carry a lot of body fat

Grams per kilogram assumes most of your weight is not fat. At 120 kg (265 lb) the formula gives 192 g a day, which is a lot of food and more than your muscle needs. Two ways to get a saner number, which land close together:

• Use your goal weight. If 90 kg (198 lb) is a realistic goal, 90 × 1.6 = 144 g.
• Use the bottom of the range on current weight. 120 × 1.2 = 144 g.

Both give about 145 g. Start there, and recalculate every 5 kg (about 10 lb) of change.

Women, plant-based eaters and other special cases

• Women: the same grams per kilogram as men. Muscle responds to protein the same way; the total is lower only because body weight usually is. There is no separate women's number.
• Plant-based: most plant proteins are a little less digestible and lower in leucine, the amino acid most tied to muscle building. Aim for the upper half of the range, 1.6 to 2.0 g/kg, and mix sources across the day: soy, lentils, beans, seitan, and grains. A pea or soy protein powder covers the gap if needed.
• Pregnant or breastfeeding: needs go up, but set the number with your doctor or midwife rather than from a chart.
• Teenagers who lift: the same 1.2 to 1.6 g/kg range, from regular meals. Growing teens also need enough total food, so do not cut calories to make room for protein. Food first; powders are rarely needed.

Is too much protein dangerous?

For healthy adults, intakes up to about 2.2 g/kg have not been shown to harm the kidneys, liver or bones, and the ISSN position stand found no harm at higher intakes in people who train. The real cost of very high intakes is what they push off the plate: the carbohydrate that fuels hard sessions and the fiber from fruit, vegetables and whole grains.

The exception is existing kidney disease. If you have it, or have been told your kidney function is reduced, do not raise protein without your doctor's sign-off. The same goes if you take medication your doctor has linked to protein intake.

When the number is right but nothing is happening

Common protein mistakes

• Counting the whole food weight as protein. 200 g (7 oz) of cooked chicken breast gives about 60 g of protein, not 200. What 100 g of protein looks like has the protein share of every common food and the raw-versus-cooked numbers.
• Using the RDA as a lifting target. 0.8 g/kg is the minimum for sedentary adults. It is about half of what helps if you train.
• Loading it all into dinner. A 70 g dinner after a 10 g breakfast reaches the total, but spreading it out is easier on the appetite and fits the research better. Move some of it to the morning.
• Relying on bars to fill the gap. Many "protein" bars carry 10 to 15 g of protein in 250 calories of sugar and fat. Check the ratio before you count them as a protein food; the label test for protein bars takes ten seconds in the aisle.

If you want to see a full day that hits the target, the 100 g protein meal plan has three complete days with grams per item.

Questions people ask

How much protein do I need to build muscle?

About 1.6 g per kg of bodyweight a day (0.7 g per lb), with up to 2.2 g/kg if you want a margin. Muscle also needs hard training and enough total calories; protein alone builds nothing.

Is there a protein calculator?

You do not need one: weight in kg × 1.6, or weight in lb × 0.7, then divide by your meals. A 150 lb person gets 105 g a day, about 26 g over four meals. Use 1.8 to 2.2 per kg instead if you are cutting.

How much protein should I eat to lose fat?

1.8 to 2.2 g/kg of bodyweight (0.8 to 1.0 g/lb) while in a modest deficit, or your goal weight × 1.6 if you carry a lot of body fat. The extra protein helps you keep muscle and stay full; the calorie deficit is what loses the fat.

Is 100 g of protein a day enough?

For someone around 62.5 kg (138 lb), 100 g is the 1.6 g/kg target. Heavier people need more to reach the same level, lighter people less. Check your row in the chart.

Do I need more protein on rest days?

No. Muscle repair continues for a day or two after training, so keep the same target every day of the week.

Does protein powder count?

Yes. A gram of protein from whey counts the same as a gram from chicken. Use it to fill gaps, not to replace meals.

How much protein do women need?

The same 1.6 g/kg as men if they lift. For a 65 kg (143 lb) woman that is about 105 g a day.

Can I eat too little protein and still gain muscle?

Beginners usually gain some muscle even at modest intakes, just more slowly. Getting from around 0.8 to 1.6 g/kg is one of the cheapest upgrades to a training plan.

Where these numbers come from

• Morton and colleagues, a systematic review, meta-analysis and meta-regression of protein supplementation on muscle mass and strength (British Journal of Sports Medicine, 2018): the 1.62 g/kg breakpoint and the 2.2 g/kg upper bound.
• International Society of Sports Nutrition position stand: protein and exercise (2017): the 1.4–2.0 g/kg range, higher intakes in a deficit, and safety in healthy adults.
• National Academies, Dietary Reference Intakes for macronutrients: the 0.8 g/kg RDA.
• Schoenfeld and Aragon, how much protein can the body use in a single meal for muscle-building (Journal of the International Society of Sports Nutrition, 2018): the 0.4 g/kg per meal, four meals a day suggestion.
• Trommelen and colleagues (Cell Reports Medicine, 2023): 100 g after training prolonged the muscle-building response compared with 25 g.
• Schoenfeld, Aragon and Krieger, protein timing meta-analysis (Journal of the International Society of Sports Nutrition, 2013): timing matters little once daily totals match.
• Helms and colleagues, dietary protein during caloric restriction in lean resistance-trained athletes (International Journal of Sport Nutrition and Exercise Metabolism, 2014): the case for higher intakes when cutting.
• Bauer and colleagues for the PROT-AGE study group (Journal of the American Medical Directors Association, 2013): 1.0–1.2 g/kg for older adults, 1.2 g/kg or more for those who exercise.