Most adults need at least 0.36 grams of protein per pound of body weight per day, which works out to about 55 grams for a 150-pound person. That number is the baseline minimum for staying healthy, but your actual target depends on your age, activity level, and life stage. Many people benefit from eating significantly more.
The Baseline for Healthy Adults
The Recommended Dietary Allowance (RDA) for protein is 0.8 grams per kilogram of body weight per day, or 0.36 grams per pound. For a 180-pound person, that’s about 65 grams. For someone weighing 140 pounds, it’s roughly 50 grams. This number represents the minimum needed to meet basic nutritional needs and prevent deficiency, not the amount that’s optimal for everyone.
The 2025-2030 Dietary Guidelines for Americans actually suggest a higher range: 1.2 to 1.6 grams per kilogram per day. For that same 180-pound person, that translates to roughly 98 to 131 grams daily. This updated range reflects growing evidence that most people do better with more protein than the old minimum suggests, particularly for maintaining muscle mass and staying full between meals.
How to Calculate Your Number
The simplest method: multiply your weight in pounds by 0.36 for the bare minimum, or by 0.55 to 0.73 for the updated guideline range. If you prefer metric, multiply your weight in kilograms by 0.8 for the minimum or by 1.2 to 1.6 for the higher range.
Here’s what that looks like for common body weights:
- 130 lbs (59 kg): minimum 47 g, guideline range 71–94 g
- 150 lbs (68 kg): minimum 54 g, guideline range 82–109 g
- 180 lbs (82 kg): minimum 65 g, guideline range 98–131 g
- 200 lbs (91 kg): minimum 73 g, guideline range 109–145 g
If you’re significantly overweight, using your goal weight or lean body mass rather than your current weight gives a more useful estimate. Protein needs scale with the amount of muscle your body maintains, not with stored fat.
Protein Needs for Building Muscle
If you’re strength training or doing regular endurance exercise, you need more protein than sedentary adults. Sports nutrition experts largely agree on a range of 1.6 to 2.2 grams per kilogram per day to maximize muscle growth and recovery. For a 170-pound person, that’s about 123 to 170 grams daily.
The lower end of that range (1.6 g/kg) captures most of the muscle-building benefit for the majority of people. Going above 2.2 g/kg doesn’t appear to provide additional advantages for muscle growth in most research. If you’re new to resistance training, you can start closer to the lower end and adjust based on how your body responds and how satisfied you feel after meals.
Why Older Adults Need More
After about age 60, your body becomes less efficient at using protein to build and repair muscle. This gradual loss of muscle mass, called sarcopenia, accelerates with each decade and contributes to falls, frailty, and loss of independence. Eating more protein can slow this process down.
While there isn’t a single agreed-upon number for older adults, there is broad consensus that the standard 0.8 g/kg minimum is too low for people over 65. Most experts recommend moderately increasing beyond that baseline. The 1.2 to 1.6 g/kg range from the updated dietary guidelines is a practical target for older adults, especially when combined with regular physical activity.
Older adults also need to pay closer attention to how they distribute protein across the day, which brings up an important point about meal timing.
Spreading Protein Across Meals
Your body can only use so much protein at once to build and repair muscle. Research shows that triggering the muscle-building process requires roughly 30 to 35 grams of high-quality protein in a single meal. Once that process kicks in, it stays active for about two and a half hours.
This matters because many people eat very little protein at breakfast, a moderate amount at lunch, and load up at dinner. That pattern means you’re missing opportunities to stimulate muscle repair earlier in the day. A more effective approach is to aim for at least 30 grams of protein at each of your three main meals. For older adults, this threshold is especially important because their muscles need a stronger signal to start the repair process.
To put 30 grams in perspective: that’s roughly a chicken breast, a cup of Greek yogurt with a handful of nuts, or three eggs plus a glass of milk. If your total daily target is 90 to 120 grams, splitting it into three meals of 30 to 40 grams each is more effective than eating 10 grams at breakfast and 80 at dinner.
Protein During Pregnancy and Breastfeeding
Protein needs increase during pregnancy, but the increase isn’t uniform across all nine months. During the first trimester, you need barely any extra protein above your normal intake. In the second trimester, your needs rise by about 9 to 10 extra grams per day. By the third trimester, you need an additional 28 to 31 grams daily compared to your pre-pregnancy baseline.
For most pregnant women, that works out to a total of roughly 75 to 100 grams per day by late pregnancy. During breastfeeding, protein needs remain elevated. If you’re exclusively nursing during the first six months, plan on about 19 extra grams per day above your normal needs. After six months of partial breastfeeding, that drops to around 13 extra grams.
Can You Eat Too Much Protein?
If your kidneys are healthy, eating more protein than the minimum is generally safe. Athletes routinely consume well above the RDA without kidney problems. That said, extremely high intakes aren’t beneficial and could strain your kidneys over time, even in healthy individuals.
The real concern is for people with existing kidney disease. Damaged kidneys have trouble filtering the waste products that come from breaking down protein, so people with reduced kidney function are often advised to limit protein to around 0.8 g/kg or less, depending on the stage of their condition. If you have kidney disease or a family history of it, your protein target should be set with your doctor rather than estimated from general guidelines.
For everyone else, the practical ceiling is somewhere around 2.2 g/kg per day. Beyond that point, you’re not getting measurable benefits for muscle or health, and you may be crowding out other important nutrients like fiber, healthy fats, and a variety of vitamins from your diet.
Putting It All Together
Your protein target comes down to three variables: your body weight, your activity level, and your life stage. A sedentary 140-pound adult can meet basic needs with around 50 grams, but would likely benefit from 70 to 90 grams. A 180-pound person who lifts weights three times a week should aim for 120 to 160 grams. An older adult who wants to preserve muscle and independence should target at least 1.2 grams per kilogram, spread across three meals.
Whatever your number turns out to be, how you distribute it matters almost as much as the total. Front-loading your protein earlier in the day, hitting at least 30 grams per meal, and choosing complete protein sources (meat, fish, eggs, dairy, soy, or complementary plant proteins) will help your body actually use what you eat rather than just process it as calories.