Most healthy adults need at least 0.36 grams of protein per pound of body weight each day. For a 150-pound person, that works out to about 54 grams. But that number is a bare minimum to prevent deficiency, not an amount optimized for muscle, weight management, or aging well. Depending on your goals and life stage, you likely need more.
The Baseline: What the RDA Actually Means
The official Recommended Dietary Allowance for protein is 0.8 grams per kilogram of body weight, or 0.36 grams per pound. This was set as the minimum amount a sedentary adult needs to avoid losing muscle and maintain basic body functions. It was never intended as a target for people who exercise, want to lose fat, or are over 65. Think of it as a floor, not a ceiling.
Here’s what that looks like for different body weights:
- 130 pounds: ~47 grams per day
- 150 pounds: ~54 grams per day
- 180 pounds: ~65 grams per day
- 200 pounds: ~72 grams per day
For context, a chicken breast has roughly 30 grams of protein, a cup of Greek yogurt has about 15 to 20 grams, and two eggs provide around 12 grams. Hitting the RDA isn’t hard for most people eating a balanced diet. The real question is whether the RDA is enough for your specific situation.
If You Exercise or Want to Build Muscle
Physically active people need significantly more protein than the RDA. Current sports nutrition guidelines recommend 1.2 to 2.0 grams per kilogram of body weight (0.5 to 0.9 grams per pound) for both strength and endurance athletes. The upper end of that range applies during intense training phases or when you’re cutting calories and trying to preserve muscle.
For a 170-pound person, that translates to roughly 85 to 153 grams per day. That’s a wide range, and where you fall depends on how hard and how often you train. Someone lifting weights four to five days a week during a calorie deficit would aim closer to the top. A recreational jogger eating at maintenance calories could stay near the bottom and still see benefits.
Timing matters to some degree. Consuming about 0.25 to 0.3 grams per kilogram of body weight (roughly 15 to 25 grams for most people) within two hours after exercise helps kickstart muscle repair. But the total amount you eat across the day matters more than any single post-workout shake.
If You’re Trying to Lose Weight
Protein is the most filling nutrient you can eat, and higher protein diets consistently outperform standard diets for fat loss. A meta-analysis of 24 controlled trials found that people eating 1.07 to 1.60 grams of protein per kilogram of body weight per day (about 0.5 to 0.7 grams per pound) lost more body fat, retained more lean muscle, and burned more calories at rest compared to those eating a standard amount. The higher-protein group burned roughly 142 extra calories per day at rest, simply from the metabolic cost of processing protein.
The practical takeaway: if you weigh 160 pounds and you’re in a calorie deficit, eating around 80 to 115 grams of protein per day will help you lose fat while keeping muscle. This is especially important because calorie restriction without adequate protein tends to cause muscle loss, which slows your metabolism and makes regaining weight easier.
If You’re Over 65
Age-related muscle loss begins in your 30s and accelerates after 65. Older adults process protein less efficiently, which means the standard RDA often isn’t enough to maintain muscle mass and strength. Most experts who study aging now recommend that adults over 65 aim higher than the baseline 0.36 grams per pound, with many suggesting a range similar to active adults.
Spreading protein evenly across meals appears especially important for older adults. One study found that muscle protein synthesis was about 25 percent greater when protein was distributed across breakfast, lunch, and dinner rather than concentrated in one or two meals. Aiming for at least 25 to 30 grams of protein at each meal ensures your body gets enough of the amino acid leucine (about 3 grams) to trigger muscle building rather than breakdown.
During Pregnancy
Pregnant women need more protein to support fetal growth. The Mayo Clinic recommends 71 grams per day during pregnancy, which is notably higher than the roughly 46 grams the RDA suggests for the average non-pregnant woman. This increased need starts in the second trimester, when fetal growth accelerates, and continues through breastfeeding.
How to Spread Protein Across Your Day
Your body can absorb and use more than 25 grams of protein in a single meal, despite a common misconception suggesting otherwise. Whole food protein sources like meat, eggs, beans, and dairy digest more slowly than isolated protein supplements, giving your body more time to absorb what you eat. That said, packing all your protein into one massive dinner isn’t ideal either.
Distributing protein across three or four meals produces better results for muscle maintenance. A practical approach: aim for 25 to 40 grams at each main meal and use snacks to fill the gap if needed. A breakfast of three eggs with cheese (about 25 grams), a lunch with a can of tuna or a cup of lentils (20 to 25 grams), and a dinner with a palm-sized portion of meat or fish (30 to 40 grams) gets most people to 80 to 90 grams without any supplements.
What Counts as Too Much
There is an upper boundary. Consuming more than about 0.9 grams per pound of body weight per day (roughly 150 grams for a 165-pound person) doesn’t offer additional benefits for most people and can strain the kidneys over time, particularly if you have existing kidney issues. Research suggests that up to 1.66 grams per kilogram of body weight per day (about 0.75 grams per pound) poses no health hazard for most adults.
Should You Calculate by Total or Lean Body Weight?
If you’re at a relatively normal body fat percentage, calculating protein based on your total body weight works fine. But if you carry significantly more body fat, that formula can overshoot your actual needs. Research comparing different calculation methods found clinically relevant overestimates in 78 to 100 percent of people with obesity when using total body weight.
A simpler workaround if you’re in a larger body: use your goal weight or your height-based ideal weight as the number you plug into the formula. If you weigh 250 pounds but your goal weight is 180, calculate your protein target using 180. This prevents the math from inflating your protein needs based on fat tissue, which doesn’t require the same protein support as muscle.