To find your daily protein needs, start with a simple formula: multiply your body weight in pounds by 0.36 (or in kilograms by 0.8). That gives you the baseline recommended intake in grams per day. A 160-pound person, for example, needs about 58 grams. But that baseline is a minimum for sedentary adults, and your actual target shifts based on your age, activity level, and goals.
The Basic Calculation
The Recommended Dietary Allowance for protein is 0.8 grams per kilogram of body weight, which works out to 0.36 grams per pound. Here’s how to do the math:
- Step 1: Take your weight in pounds.
- Step 2: Multiply by 0.36.
- Result: Your minimum daily protein in grams.
If you prefer metric, divide your weight in pounds by 2.2 to get kilograms, then multiply by 0.8. A 165-pound person (75 kg) lands at about 60 grams per day. This number keeps a healthy, mostly sedentary adult from losing muscle. It is not optimized for building muscle, losing fat, or staying strong as you age.
How Activity Level Changes Your Target
If you exercise regularly, the RDA minimum is too low. Athletes and active people in heavy training do best in the range of 1.2 to 1.6 grams per kilogram per day. That applies whether you lift weights, run long distances, or play team sports, because intense exercise drives your body to rebuild different types of protein depending on the activity.
For a 160-pound person (about 73 kg), that range translates to roughly 88 to 117 grams of protein per day. If you work out three or four times a week at moderate intensity, aiming for the lower end of that range is reasonable. If you train hard most days, push toward the higher end.
Protein Needs During Weight Loss
When you’re eating fewer calories than you burn, your body can break down muscle along with fat. Eating more protein helps protect that muscle tissue. The recommended range during weight loss is about 1.0 to 1.2 grams per kilogram of body weight. For a 150-pound person, that comes out to roughly 68 to 82 grams daily.
This is noticeably higher than the 0.8 g/kg baseline, and for good reason. Holding onto muscle while losing fat improves your metabolism and shapes the kind of results most people are actually after. If you’re both dieting and strength training, you may benefit from the higher end of the athletic range instead.
Why Older Adults Need More
After about age 50, your body becomes less efficient at using dietary protein to maintain muscle. This gradual muscle loss, called sarcopenia, accelerates with each decade and contributes to falls, fractures, and loss of independence. Many researchers now argue that the standard RDA of 0.8 g/kg is insufficient for older adults and that something closer to 1.0 to 1.2 g/kg per day better supports muscle maintenance.
If you’re over 65 and weigh 165 pounds, that means aiming for 75 to 90 grams of protein a day rather than the 60 grams the baseline formula produces. Spreading that protein across meals (more on this below) matters even more as you age, because older muscles need a stronger protein signal to kick-start repair.
Adjustments During Pregnancy and Breastfeeding
Protein needs rise during pregnancy, but the increase is smaller than most people expect in the first trimester. Major health authorities recommend adding only about 1 gram of extra protein per day in the first trimester, roughly 9 grams extra in the second, and 28 to 31 grams extra in the third. That third-trimester bump is significant: a woman who normally needs 50 grams a day would need close to 80.
During breastfeeding, the body needs about 19 extra grams of protein per day in the first six months and around 13 extra grams after that as the baby starts eating solid food. Some guidelines express this as a total of about 1.1 grams per kilogram of body weight per day.
How to Spread Protein Across the Day
Your body can only use so much protein at once for muscle repair. The threshold that triggers your muscles to shift from breaking down to building up is about 3 grams of leucine, an amino acid found in roughly 30 grams of high-quality protein. Eating all your protein in one massive dinner means you miss opportunities to stimulate that repair process at breakfast and lunch.
A practical approach: divide your daily target by three or four and aim for that amount at each meal. If your target is 90 grams, that’s about 30 grams per meal, which is roughly a palm-sized portion of chicken, fish, or tofu plus a side that contributes extra protein (Greek yogurt, beans, eggs). This even distribution is especially important if you’re training or over 50.
Plant Protein vs. Animal Protein
Animal proteins (meat, fish, eggs, dairy) contain all the essential amino acids your body can’t make on its own, and they’re more digestible overall. They’re particularly rich in leucine and lysine, two amino acids critical for muscle building. Plant proteins (beans, lentils, nuts, soy, grains) tend to be lower in one or more essential amino acids and slightly less digestible.
This doesn’t mean plant-based eaters can’t meet their needs. It means they should eat a variety of protein sources throughout the day so that the amino acid gaps in one food get filled by another. Soy and quinoa are exceptions that provide a complete amino acid profile on their own. If you eat exclusively plant-based, aiming for the higher end of your recommended range gives you a buffer for the lower digestibility.
Is There an Upper Limit?
For people with healthy kidneys, high protein intake does not appear to cause kidney damage. One study followed healthy men eating about 1.4 grams per pound of body weight (3 g/kg) daily for a full year with no adverse effects. Another trial tested 2 grams per pound (4.4 g/kg) for two months, also without measurable harm. That said, consuming more than about 0.9 grams per pound per day (roughly 150 grams for a 165-pound person) goes well beyond what most people need and offers diminishing returns.
If you have existing kidney disease, high protein intake can accelerate the problem, so your target should come from your care team. For everyone else, the practical ceiling isn’t really about safety. It’s about the fact that excess protein beyond what your muscles can use gets converted to energy or stored, just like extra carbs or fat.
Quick Reference by Goal
- Sedentary adult: 0.8 g/kg (0.36 g/lb)
- Weight loss: 1.0 to 1.2 g/kg (0.45 to 0.55 g/lb)
- Active/athlete: 1.2 to 1.6 g/kg (0.55 to 0.73 g/lb)
- Adults over 65: 1.0 to 1.2 g/kg (0.45 to 0.55 g/lb)
- Third trimester pregnancy: baseline plus ~28 to 31 g/day
- Breastfeeding (first 6 months): baseline plus ~19 g/day
Pick the category that fits you, multiply your weight by the corresponding number, and you have a daily target in grams. Track it for a week using a food diary or app to see where you actually land, then adjust your meals from there.