The standard recommended daily intake of protein for adults is 0.8 grams per kilogram of body weight, or about 0.36 grams per pound. For a 150-pound person, that works out to roughly 54 grams per day. But this baseline number is a minimum to prevent deficiency, not necessarily the amount that keeps you in optimal health. Your actual needs depend on your age, activity level, and whether you’re pregnant or managing a chronic condition.
How to Calculate Your Baseline
The simplest way to find your protein target is to multiply your body weight in pounds by 0.36. A 180-pound adult needs about 65 grams per day at minimum; a 130-pound adult needs about 47 grams. In metric terms, multiply your weight in kilograms by 0.8. These numbers assume a sedentary or lightly active lifestyle and no medical conditions that affect protein metabolism.
To put those grams in real-food terms: a chicken breast has about 30 grams of protein, a cup of Greek yogurt has around 15 to 20 grams, two eggs have about 12 grams, and a cup of cooked lentils provides roughly 18 grams. Most people eating a varied diet with regular meals hit the 0.8 g/kg minimum without much effort. The more relevant question for many people is whether they should be eating more than that baseline.
Higher Targets for Active People
If you exercise regularly, the baseline recommendation likely isn’t enough. The International Society of Sports Nutrition recommends 1.4 to 2.0 grams per kilogram of body weight per day for most exercising individuals. That’s nearly double the standard RDA at the high end. For a 170-pound person, this range translates to roughly 108 to 154 grams per day.
This range applies whether you’re lifting weights, running, cycling, or doing high-intensity interval training. Resistance training creates the strongest demand for protein because your muscles need amino acids to repair and grow. There’s even some evidence that intakes above 3.0 g/kg per day may help resistance-trained individuals lose fat, though that level (over 230 grams for a 170-pound person) is extreme and unnecessary for most gym-goers. Endurance athletes benefit from prioritizing carbohydrates for energy, but adding protein helps offset muscle damage and speeds recovery.
How to Spread Protein Across the Day
Your body can only use so much protein at once for building muscle. Research suggests that 20 to 25 grams of protein every three to four hours, spread across at least four meals, does a better job of stimulating muscle repair than eating the same total amount in one or two large servings. The practical target is about 0.4 to 0.55 grams per kilogram per meal.
For a 160-pound person aiming for 1.6 g/kg per day, that’s roughly 29 grams per meal across four meals. This doesn’t mean protein eaten in a larger serving is wasted. Your body still digests and uses it for other functions. But if maximizing muscle maintenance or growth matters to you, distributing protein more evenly gives you a measurable advantage over loading it all into dinner.
Protein Needs After 65
Older adults need more protein than younger ones, not less. After 65, your body becomes less efficient at converting dietary protein into muscle tissue, a shift that accelerates age-related muscle loss. The PROT-AGE study group, an international panel focused on nutrition in aging, recommends that adults over 65 consume at least 1.0 to 1.2 grams per kilogram per day. That’s 25 to 50 percent more than the standard RDA.
If you’re over 65 and physically active, aim for the higher end of that range or above 1.2 g/kg per day. Older adults dealing with acute or chronic illness may need 1.2 to 1.5 g/kg per day to support healing and preserve lean body mass. For a 155-pound older adult, that upper range means about 95 to 105 grams daily. Since appetite often decreases with age, choosing protein-dense foods at every meal becomes especially important.
During Pregnancy
Protein needs increase during pregnancy to support fetal growth and changes in maternal tissue. The Mayo Clinic recommends about 71 grams of protein per day during pregnancy, which is roughly 25 grams more than what many non-pregnant women consume. This is one case where tracking daily totals for a few days can be useful, since many pregnant women fall short without realizing it, particularly in the first trimester when nausea limits food choices.
When Kidney Disease Changes the Math
Chronic kidney disease is the major exception to the “more protein is fine” trend. When kidney function declines significantly, the kidneys struggle to filter the waste products that protein metabolism generates. In clinical trials, people with moderate kidney impairment were placed on restricted diets of about 0.58 g/kg per day, well below the standard RDA, to slow disease progression.
However, the picture is more nuanced than “less is always better.” In people with CKD, increasing protein intake above 0.8 g/kg per day was associated with roughly an 8 percent decrease in mortality risk for every additional 0.2 g/kg per day. Restricting protein too aggressively carries its own dangers: intakes below 0.4 g/kg per day can lead to protein malnutrition. The right target depends entirely on how much kidney function remains, which is why protein intake in kidney disease needs to be guided by lab results and a care team rather than general guidelines.
Upper Limits for Healthy People
For the average healthy adult who isn’t a competitive athlete or bodybuilder, keeping protein intake at or below 2.0 grams per kilogram of ideal body weight is a reasonable ceiling. For a 140-pound person, that’s about 125 grams per day. There’s no strong evidence that going higher causes kidney damage in people with healthy kidneys, but there’s also limited benefit beyond that point for non-athletes.
Very high protein diets can crowd out other important nutrients if you’re filling up on protein at the expense of fruits, vegetables, whole grains, and healthy fats. They can also be hard on digestion. If you’re consistently eating above 2.0 g/kg per day without a specific training goal, you’re likely spending money on protein you don’t need rather than causing harm, but the returns diminish quickly.
Putting the Numbers Together
- Sedentary adults: 0.8 g/kg per day (about 0.36 g per pound)
- Regularly active adults: 1.4 to 2.0 g/kg per day
- Adults over 65: 1.0 to 1.2 g/kg per day, higher if active or ill
- Pregnant women: approximately 71 grams per day
- Practical upper limit for most people: 2.0 g/kg per day of ideal body weight
The 0.8 g/kg number that shows up most often in nutrition labels and government guidelines is a floor, not a target. Most people benefit from eating somewhat above it, and certain groups benefit from eating well above it. The easiest approach is to include a protein source at every meal, aim for 20 to 30 grams per sitting, and adjust upward if you’re training hard, over 65, or recovering from illness.