Most adults need at least 0.8 grams of protein per kilogram of body weight per day, which works out to about 0.36 grams per pound. For a 150-pound person, that’s roughly 54 grams. But that number is a minimum to prevent deficiency, not necessarily an optimal target. Your actual needs depend on your age, activity level, and goals.
The Baseline for Sedentary Adults
The Recommended Dietary Allowance (RDA) of 0.8 grams per kilogram is designed for healthy adults who aren’t particularly active. It covers what your body needs to maintain basic functions like immune health, enzyme production, and tissue repair. For most people, this lands somewhere between 45 and 65 grams a day.
To find your personal baseline, divide your weight in pounds by 2.2 to get your weight in kilograms, then multiply by 0.8. A 180-pound person, for example, weighs about 82 kilograms and would need a minimum of 65 grams daily. That’s roughly the amount in two chicken breasts or three cups of Greek yogurt.
The general recommended range spans from 0.8 to 1.8 grams per kilogram, depending on how active you are and what your body is doing. Most nutrition guidelines also frame protein as 10 to 35 percent of total daily calories, which gives you a wide window to work within.
How Exercise Changes the Math
If you lift weights regularly or train for running, cycling, or other endurance events, 0.8 grams per kilogram won’t be enough. People who do regular strength training need 1.2 to 1.7 grams per kilogram to support muscle repair and growth. Endurance athletes like distance runners fall in a slightly narrower range of 1.2 to 1.4 grams per kilogram. Highly active individuals and competitive athletes may need as much as 1.8 to 2.0 grams per kilogram.
For a 170-pound person who lifts weights four times a week, that translates to roughly 93 to 131 grams of protein per day. That’s a meaningful jump from the 62-gram baseline, and it’s the difference between slowly losing muscle over time and actually building it.
Why Older Adults Need More
Your body becomes less efficient at using protein as you age. Muscles break down faster and rebuild slower, a process that accelerates after 65 and can lead to significant loss of strength and mobility. Researchers recommend that older adults consume 1.0 to 1.2 grams per kilogram of body weight daily, which is 25 to 50 percent more than the standard RDA.
The official RDA doesn’t actually change after age 19. It stays at 0.8 grams per kilogram for all adults. But a growing body of evidence suggests that number is too low for people over 65 who want to preserve muscle mass and stay independent. One important exception: people with kidney disease should talk to their doctor before increasing protein, since the kidneys handle the waste products of protein metabolism.
Protein During Weight Loss
When you’re eating fewer calories than you burn, your body doesn’t just pull energy from fat. It also breaks down muscle for fuel, especially if your protein intake is low. To preserve lean muscle mass during a calorie deficit, guidelines suggest eating 0.7 to 1.0 grams of protein per pound of body weight. That’s considerably higher than the RDA, and for good reason.
For a 160-pound person trying to lose weight, that means 112 to 160 grams of protein daily. It sounds like a lot, and it requires deliberate planning. But keeping protein high during weight loss helps you hold on to the muscle that keeps your metabolism running and makes everyday movement easier. Losing weight without adequate protein often means losing a significant percentage of muscle along with fat.
How to Spread Protein Across Meals
Your muscles can only use so much protein at one time to build new tissue. Research shows that about 30 grams of protein in a single meal is enough to maximally stimulate muscle rebuilding. Eating 60 grams in one sitting doesn’t double the effect. Beyond that threshold, the extra protein gets used for energy or other functions rather than muscle repair.
This means how you distribute protein matters almost as much as how much you eat total. If your target is 90 grams a day, three meals with 30 grams each will do more for your muscles than a 10-gram breakfast, a 20-gram lunch, and a 60-gram dinner. You don’t need to be exact, but aiming for at least 25 to 30 grams per meal is a practical target that most people can hit with a palm-sized portion of meat, fish, or a combination of plant-based sources.
Plant-Based Diets and Protein Quality
Not all protein is absorbed equally. Animal proteins from meat, eggs, and dairy have digestibility rates around 90 to 95 percent, meaning your body can access and use nearly all the protein you eat. Plant proteins from beans, grains, nuts, and legumes typically have digestibility rates of 75 to 80 percent. Compounds naturally present in plant foods can interfere with protein digestion and reduce how much your body actually absorbs.
If you eat a fully plant-based diet, you may need to aim for the higher end of your protein range to compensate for this difference. Someone who would need 70 grams on a mixed diet might want to target 80 to 90 grams from plant sources. Cooking, soaking, and fermenting plant foods can improve their digestibility, which is one reason why tofu (fermented soy) is a more efficient protein source than raw soybeans.
Is Too Much Protein Dangerous?
For healthy adults who aren’t elite athletes or serious bodybuilders, Harvard Health suggests keeping protein intake at or below 2 grams per kilogram of ideal body weight. For a person whose ideal weight is 70 kilograms (about 154 pounds), that ceiling is 140 grams per day.
The main documented risk of very high protein diets is an increased chance of kidney stones. For people with healthy kidneys, there’s no strong evidence that moderately high protein intake causes kidney damage. But if you already have reduced kidney function, excess protein adds to the workload your kidneys have to handle, which can accelerate problems.
Quick Reference by Body Weight
- 130 lbs (59 kg): 47g (sedentary), 71–100g (active), 91–130g (weight loss)
- 150 lbs (68 kg): 54g (sedentary), 82–116g (active), 105–150g (weight loss)
- 170 lbs (77 kg): 62g (sedentary), 92–131g (active), 119–170g (weight loss)
- 200 lbs (91 kg): 73g (sedentary), 109–155g (active), 140–200g (weight loss)
These ranges use 0.8 g/kg for sedentary adults, 1.2 to 1.7 g/kg for active individuals, and 0.7 to 1.0 g/lb for weight loss. Your ideal number depends on which category best matches your current situation and goals.