Your daily protein target depends on your body weight, activity level, and goals. The baseline recommendation is 0.36 grams of protein per pound of body weight (0.8 g per kilogram), but that number is a minimum for sedentary adults and falls short for most people who exercise, want to lose fat, or are over 65. A more useful range for most active people lands between 0.6 and 0.9 grams per pound per day.
Below is a straightforward way to calculate your number, along with adjustments for specific goals and life stages.
The Basic Protein Formula
The simplest calculation multiplies your body weight by a factor that matches your activity level and goals. Here’s how it breaks down:
- Sedentary adults: 0.36 g per pound (0.8 g/kg)
- Recreationally active: 0.5–0.7 g per pound (1.0–1.4 g/kg)
- Building or maintaining muscle: 0.6–0.9 g per pound (1.4–2.0 g/kg)
- Losing weight on a calorie deficit: 0.7–1.0 g per pound (1.5–2.2 g/kg)
- Adults over 65: 0.45–0.55 g per pound (1.0–1.2 g/kg)
- Pregnant (late stages): approximately 0.7 g per pound (1.5 g/kg)
To use the formula: take your weight in pounds, multiply by the factor that fits your situation. A 160-pound person who strength trains three times a week would multiply 160 by 0.7 to 0.9, landing at roughly 112 to 144 grams of protein per day. A 140-pound sedentary adult would need a minimum of about 50 grams.
Why the Baseline RDA Is Too Low for Most People
The RDA of 0.8 g/kg was set to prevent deficiency in healthy, sedentary adults. It’s the floor, not the target. If you exercise regularly, are trying to lose body fat, or are older than 65, your body needs significantly more protein to repair muscle tissue, preserve lean mass, and support recovery. The International Society of Sports Nutrition recommends 1.4 to 2.0 g/kg per day for exercising individuals, which is nearly double the RDA baseline.
Adjusting for Weight Loss
Protein becomes especially important when you’re eating fewer calories than you burn. A meta-analysis of 24 randomized controlled trials found that people eating 1.07 to 1.60 g/kg per day (roughly 27% to 35% of total calories from protein) while in a calorie deficit lost more body weight and retained more lean mass than those eating standard protein levels. The higher-protein group also maintained a higher resting metabolic rate, burning about 140 extra calories per day compared to the standard-protein group.
Protein also helps with hunger. It’s the most satiating macronutrient, meaning it keeps you full longer per calorie than fat or carbohydrates. If you’re cutting calories and finding yourself hungry, increasing your protein percentage is one of the most effective adjustments you can make. Research suggests that up to 1.66 g/kg per day poses no health hazard during calorie restriction, and intakes of 25% to 30% of total calories from protein for 10 to 12 weeks show no adverse effects.
Adjusting for Age
Muscle loss accelerates after 65. Your body becomes less efficient at using dietary protein to build and repair tissue, a process researchers call “anabolic resistance.” To counteract this, experts recommend older adults consume 1.0 to 1.2 g/kg per day, about 50% more than the standard RDA. For a 170-pound older adult, that translates to roughly 77 to 93 grams daily. Staying at or above this range helps preserve muscle mass, physical function, and independence.
Adjusting for Pregnancy
Protein needs rise throughout pregnancy. The current RDA sets a blanket recommendation of 1.1 g/kg per day for all stages, but more recent research using precise measurement techniques found the actual requirement is closer to 1.2 g/kg in early pregnancy (around 16 weeks) and 1.52 g/kg in late pregnancy (around 36 weeks). For a 150-pound woman, that’s roughly 82 grams early on and 103 grams in the third trimester.
What About Body Composition?
Standard protein formulas use total body weight, which works well for most people. But if you carry significantly more body fat (a BMI of 30 or above), calculating from total weight can overestimate your needs because fat tissue doesn’t require protein the way muscle does. In clinical nutrition, practitioners sometimes use “corrected body weight” or fat-free mass for these calculations. A practical workaround: if you’re significantly overweight, use your goal weight or ideal body weight instead of your current weight when doing the multiplication.
On the other end, if you’re underweight (BMI below 20), using actual body weight may underestimate your needs. In either case, the per-kilogram formula works best when applied to a reasonable estimate of your lean mass.
Spreading Protein Across Meals
Your body can only use so much protein at once for muscle repair. Research shows that muscle protein synthesis ramps up as you eat more protein in a single sitting, but the response plateaus at around 30 grams per meal. One study found that eating a serving of beef with 30 grams of protein maximally stimulated muscle building, and larger portions didn’t increase the response further. Some data suggests the ceiling may extend to around 45 grams per meal for people eating at least two high-protein meals per day.
The practical takeaway: instead of loading all your protein into one or two meals, spread it across three or four. If your target is 120 grams per day, aim for roughly 30 to 40 grams at each of three meals rather than 20 grams at breakfast, 20 at lunch, and 80 at dinner. This evenly distributed pattern is associated with greater leg lean mass and strength.
What Protein Looks Like in Real Food
Numbers in grams are abstract until you connect them to actual meals. Here’s what common protein sources deliver per typical serving:
- Chicken breast (4 oz cooked): ~35 g
- Ground beef or salmon (4 oz cooked): ~25–28 g
- One large egg: ~6 g
- Plain low-fat yogurt (6 oz): ~9 g
- Greek yogurt (6 oz): ~15–17 g
- Lentils (1 cup cooked): ~18 g
- Tofu (½ cup): ~10 g
- Whey protein scoop: ~20–25 g
A breakfast of three eggs and a container of Greek yogurt gets you to about 33 grams. A lunch with a chicken breast over rice hits 35 grams. A dinner of salmon with lentils on the side adds another 45 or so. That’s already 113 grams without trying especially hard, which covers the needs of most active adults weighing around 150 pounds.
A Note on Kidney Health
You may have heard that high protein intake damages your kidneys. For healthy people with normal kidney function, there’s no strong evidence that protein intakes in the ranges discussed here cause harm. The concern is real, however, for people who already have chronic kidney disease. When kidneys are compromised, they struggle to clear the waste products of protein metabolism, which can accelerate damage. If you have kidney disease or significantly reduced kidney function, your protein needs are different and lower, and working with a dietitian familiar with kidney health is the right move.