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Quick answer: The protein floor is 0.36 grams per pound of body weight daily, about 58 grams for a 160 lb adult. For building muscle or keeping it while losing fat, research supports 0.7 to 1 gram per pound, roughly 115 to 160 grams at that weight. Use the calculator below for your goal.
Ranges follow the RDA and the International Society of Sports Nutrition position stand.
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Protein needs scale with body weight and goal. The US RDA of 0.8 grams per kilogram (0.36 per pound) is a floor that prevents deficiency, not an optimum for training. The International Society of Sports Nutrition position stand supports 1.6 to 2.2 grams per kilogram (0.7 to 1 per pound) for building muscle or protecting it during fat loss, and 1.2 to 1.6 for endurance athletes. Research in older adults (PROT-AGE) raises the floor after 65 to counter age-related muscle loss.
The calculator shows a range, not a single magic number, because the research does. Anywhere inside your range works; consistency and total calories decide the results.
| Food | Protein |
|---|---|
| Chicken breast, cooked (3.5 oz) | about 31 g |
| Salmon, cooked (3.5 oz) | about 25 g |
| Greek yogurt, plain (7 oz cup) | about 20 g |
| Lentils, cooked (1 cup) | about 18 g |
| Cottage cheese (half cup) | about 12 g |
| Two large eggs | about 12 g |
| Tofu, firm (3.5 oz) | about 10 g |
| Peanut butter (2 tbsp) | about 7 g |
USDA average values. A 120 g day is roughly: eggs and yogurt at breakfast, chicken at lunch, salmon at dinner, plus snacks.
Maintenance for a sedentary adult and a fat-loss phase for a lifter are different jobs. In a calorie deficit, higher protein (0.7 to 1 gram per pound) consistently preserves muscle and blunts hunger, which is why the fat-loss target here is as high as the muscle-building one.
Older adults process protein less efficiently, a problem called anabolic resistance. Research consensus (PROT-AGE, ESPEN) recommends at least 1.0 to 1.2 grams per kilogram after 65, plus resistance training, to slow sarcopenia. The calculator applies that floor automatically.
Muscle protein synthesis responds best to 25 to 40 grams per meal. Three to four protein-anchored meals beat one giant dinner, especially for older adults. Breakfast is where most American diets run short.
Whole foods bring iron, B12, calcium, and fiber along with protein. Powder is a convenience for busy days, not a requirement; nothing about it builds muscle better than the same grams from food.
At minimum, 0.36 grams per pound of body weight, the RDA floor: about 58 grams at 160 lb. If you train, diet, or are over 65, research supports substantially more, typically 0.5 to 1 gram per pound depending on your goal. Most Americans clear the floor but fall short of training targets.
The ISSN position stand supports 1.6 to 2.2 grams per kilogram, which is 0.7 to 1 gram per pound of body weight: 115 to 160 grams daily for a 160 lb lifter. Intakes above 1 gram per pound show no extra muscle benefit in controlled studies.
One large egg has about 6 grams of complete protein, split between the white (about 3.6 g) and the yolk (about 2.7 g). The yolk also carries most of the vitamins, so eating whole eggs beats whites-only for nutrition per calorie.
A cooked 3.5 oz (100 g) chicken breast has about 31 grams of protein; a typical whole breast weighs 6 to 8 oz cooked and delivers 50 to 60 grams. It is the cheapest dense protein in most US grocery stores per gram.
Only about 1.3 grams; bananas are a carbohydrate food, not a protein source. Pair one with Greek yogurt or peanut butter and the snack jumps to 8 to 20 grams while the banana handles quick energy.
For your safety
Important: These targets are for healthy adults. If you have kidney disease or reduced kidney function, high protein intakes need your clinician’s approval first. Targets are educational ranges from published research, not a prescription; total calories, training, and sleep matter as much as protein for any body composition goal.
Disclaimer: These statements have not been evaluated by the Food and Drug Administration. This content is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.
