Protein targets explained: how much you need and why

Ask five people how much protein you need and you might hear five answers, from “the RDA is plenty” to “a gram per pound, minimum.” They aren’t all wrong. They’re answering different questions: how much prevents a deficiency, how much supports training, and how much helps you hold on to muscle while eating less.

Here’s what the main guidelines and studies actually say, how to turn that into food on your plate, and how Calorix sets your daily protein target.

The RDA is a floor, not a goal

The Recommended Dietary Allowance for adults is 0.8 grams of protein per kilogram of body weight per day, from the Institute of Medicine’s report on macronutrients. For the reference body weights used in the official tables, that works out to 56 grams a day for men and 46 grams for women.

An RDA is defined as the average daily intake that meets the needs of nearly all (97 to 98 percent) healthy people in a group. It’s built to prevent a shortfall, not to describe the best intake for building muscle, recovering from training or staying full. The same tables give adults an acceptable range of 10 to 35 percent of calories from protein, so eating well above 0.8 g/kg is still within mainstream guidance.

The 2025–2030 Dietary Guidelines aim higher

The Dietary Guidelines for Americans, 2025–2030, released in January 2026, ask people to prioritize protein foods at every meal. They set a protein goal of 1.2 to 1.6 grams per kilogram of body weight per day, “adjusting as needed based on your individual caloric requirements,” and encourage a variety of animal and plant sources, from eggs, poultry, seafood and red meat to beans, lentils, nuts, seeds and soy.

The RDA itself hasn’t changed. Think of 0.8 g/kg as the minimum and the guidelines’ range as the everyday goal.

If you exercise: about 1.4 to 2.0 g/kg

For active people, the International Society of Sports Nutrition (ISSN) position stand concludes that 1.4 to 2.0 g/kg per day is sufficient for most exercising individuals to build and maintain muscle.

The best-known estimate of where extra protein stops helping comes from a 2018 meta-analysis of 49 trials with 1,863 people doing resistance training. Gains in fat-free mass leveled off at an average total intake of about 1.6 g/kg per day (1.62, to be exact). The estimate was uncertain, with a confidence interval running from about 1.0 to 2.2 g/kg, so the authors suggested that people trying to maximize muscle gains could aim for about 2.2 g/kg.

When you’re eating less

Protein needs appear to rise when calories are restricted, especially for lean, trained people. The ISSN notes that 2.3 to 3.1 g/kg per day may be needed to maximize lean mass retention in resistance-trained people during calorie restriction. A 2014 systematic review arrived at 2.3 to 3.1 g per kilogram of fat-free mass, scaled upward as the deficit gets steeper and the person gets leaner.

Keep those figures in context. They come from studies of lean, resistance-trained athletes, often on aggressive diets, and describe that group rather than everyone who wants to eat a little less. For most people, the practical message is simpler: when total food goes down, protein deserves more attention, not less.

Older adults may need more

The PROT-AGE study group notes that the body’s anabolic response to protein declines with age. It recommends at least 1.0 to 1.2 g/kg per day for adults over 65, at least 1.2 g/kg for those who exercise or are otherwise active, and 1.2 to 1.5 g/kg for most older adults with an acute or chronic illness. The exception is severe kidney disease (an estimated GFR below 30) without dialysis, where protein may need to be limited.

Does it matter how you spread it out?

It may help, but the daily total has stronger evidence behind it.

• In a small 2014 crossover study of eight adults, eating about 30 grams of protein at each of three meals led to 25 percent higher 24-hour muscle protein synthesis than the same daily amount skewed toward dinner (roughly 11, 16 and 63 grams).
• The popular idea that your body can only “use” 20 to 30 grams at a time doesn’t hold up well. In a 2023 study, 100 grams of protein after exercise produced a larger and longer-lasting anabolic response, beyond 12 hours, than 25 grams.
• As practical guidance, the ISSN suggests 20 to 40 grams per meal (about 0.25 g/kg), spread every 3 to 4 hours. A 2018 review suggests about 0.4 g/kg per meal across at least four meals to reach 1.6 g/kg a day.

The evidence on daily totals includes long-term training trials like those in the 2018 meta-analysis, while most evidence on meal timing comes from short lab studies of muscle protein synthesis. So get the total right first, then spread it across your meals in whatever way suits your day.

Is a high-protein diet safe?

For healthy adults, the evidence is reassuring. A 2018 meta-analysis of 28 trials found that higher-protein diets (at least 1.5 g/kg, 20 percent of calories or 100 grams a day) did not harm kidney function in adults without kidney disease.

Kidney disease is different. The NIDDK explains that some people with chronic kidney disease need moderate amounts of protein so waste doesn’t build up in the blood, while people on dialysis may need more, and it recommends working with a dietitian or health care professional to find the right balance.

Talk to your doctor or a registered dietitian before changing your protein intake if you:

• have kidney disease, diabetes or another medical condition
• are pregnant or breastfeeding (the RDA rises to 71 grams a day)
• are under 18
• have a history of disordered eating
• take medication such as a GLP-1 receptor agonist

If you use a GLP-1 medication, our GLP-1 and protein guide and GLP-1 protein calculator can help you prepare for that conversation.

Where to get it

Here’s how much protein some common foods provide, according to USDA FoodData Central:

You don’t need any single food to hit your number. A palm-sized portion of fish or chicken at lunch, yogurt or cottage cheese at breakfast, and beans or tofu at dinner add up quickly, and mixing animal and plant sources is exactly what the dietary guidelines suggest.

How Calorix sets your protein target

Calorix uses one simple rule, the same one behind our protein calculator:

• 1.6 g per kg of goal-adjusted weight when you’re maintaining or gaining
• 2.0 g per kg of goal-adjusted weight when you’re losing
• capped at 2.2 g per kg of your current weight, and at 35 percent of your daily calories

Your goal-adjusted weight is your goal weight if you’ve set one for a lose or gain goal; otherwise it’s your current weight. Using goal weight keeps the target from climbing unrealistically high when your current weight is well above your goal. The 35 percent cap matches the top of the acceptable range in the DRI tables and only comes into play when a calorie target is low.

These examples assume a calorie target high enough that the 35 percent cap doesn’t kick in.

Here’s how that lines up with the evidence. The default of 1.6 g/kg sits at the top of the dietary guidelines’ range and inside the ISSN’s range for active people. During a deficit, the 2.0 g/kg is applied to your goal weight, so relative to your current weight it can land inside the guidelines’ range: in the example above, 150 grams is 1.5 g/kg of the current 100 kg. Either way, the higher multiplier reflects research suggesting needs rise when you eat less. And the 2.2 g/kg cap matches the upper end of the 2018 meta-analysis.

Spread across the day, 128 grams over four meals is 32 grams each, which happens to be exactly 0.4 g/kg per meal for an 80 kg person. Calorix shows your protein target next to your calories, carbs, fat, fiber and water, tracks your progress with the protein tracker, and suggests meal ideas based on the macros you have left for the day.

If a doctor or dietitian has given you a specific protein target, theirs comes first.

The bottom line

• 0.8 g/kg prevents a shortfall for almost everyone, but it isn’t an optimal target.
• The current US guidelines aim for 1.2 to 1.6 g/kg, and the ISSN considers 1.4 to 2.0 g/kg sufficient for most active people.
• Muscle-building benefits level off around 1.6 g/kg on average, with about 2.2 g/kg as a reasonable upper target.
• Needs appear to rise during a calorie deficit and as you get older.
• Spreading protein across meals may help, but get the daily total right first.
• If you have kidney disease or another medical condition, let your care team set the number.

Work out your own number with the protein calculator, or see how it fits with your calories, carbs and fat in the macro calculator.