How Much Protein Per Day? Targets by Bodyweight and Goal

The direct answer: most active adults need roughly 0.7 to 1 gram of protein per pound of bodyweight per day, or about 1.6 to 2.2 grams per kilogram. Put in concrete terms, a 150-pound person lands between 105 and 150 grams a day, while a 200-pound person lands between 140 and 200 grams. Where you fall in that range depends on your goal, your training load, and whether you are eating at maintenance, a surplus, or a deficit.

It helps to know where that range comes from and why it is so much higher than the number printed on a nutrition label. The RDA (Recommended Dietary Allowance) for protein is about 0.36 grams per pound, or 0.8 grams per kilogram, which for a 150-pound adult is only about 54 grams a day. That figure is a floor set to prevent deficiency in a sedentary, non-training population, not an optimal target for anyone lifting weights, running regularly, or trying to change body composition. Once you add resistance training, a calorie deficit, or a muscle-gain goal into the picture, the evidence consistently points to a target two to three times higher than the RDA floor.

Protein needs are not one-size-fits-all; they shift meaningfully with your goal. For general health and maintenance with light-to-moderate activity, 1.2 to 1.6 grams per kilogram of bodyweight (roughly 0.55 to 0.7 g/lb) is a reasonable target. For muscle gain, most research supports 1.6 to 2.2 grams per kilogram (about 0.7 to 1 g/lb), which is enough to fully support muscle protein synthesis without wasted excess. For fat loss during a calorie deficit while training, the range shifts up slightly to 1.8 to 2.4 grams per kilogram, because the higher end protects lean muscle mass while calories are restricted. Hitting the muscle-gain end of that range does little on its own without a training stimulus to direct the extra protein toward, which is where a structured AI strength training plan earns its keep.

That last point surprises a lot of people: protein need goes up, not down, when you cut calories. When total intake drops, the body is more prone to breaking down muscle tissue alongside fat for energy, and a higher protein intake is one of the few reliable levers that blunts that muscle loss. So if you are starting a cut, the correct move is to raise protein as a percentage of intake even as total calories fall, not to cut it proportionally with everything else.

One more detail worth getting right: protein targets should scale off a reasonable, healthy bodyweight, not off an inflated current weight for people carrying a higher body fat percentage. Fat tissue does not need protein to be maintained the way muscle does, so someone significantly overweight who calculates their target off total bodyweight will land on an unnecessarily high number. A more accurate approach uses lean body mass or a goal weight closer to a healthy range as the basis for the calculation.

Protein needs rise with age, not fall. Starting around 40 to 50, adults begin losing muscle mass and strength at a low but steady rate each year, a process called sarcopenia, and higher protein intake is one of the most effective non-training countermeasures. Many researchers now recommend at least 1 to 1.2 grams per kilogram of bodyweight even for older adults at rest, rising to 1.6 grams per kilogram for those who strength train, which is notably higher than the general maintenance range for younger adults. Protein is one lever among several for countering age-related decline; an AI longevity coach can tie the intake target to the rest of the healthspan picture, training load, sleep, and recovery, rather than treating it in isolation.

Sex differences in protein need are smaller than most people assume, and they largely trace back to bodyweight and activity level rather than sex itself. Targets in this guide are expressed per pound or per kilogram of bodyweight specifically because that scaling already accounts for the average size difference between men and women; a heavier or more active woman needs more total grams than a lighter, sedentary man, not less, simply because the target scales with body size and training load rather than with sex as a fixed rule. Pregnancy and breastfeeding raise protein needs further and should follow a clinician's specific guidance rather than these general population ranges.

Hitting your gram target on any single day tells you very little. Daily food logging is noisy: a restaurant meal, a skipped snack, or a day spent traveling can swing intake by 30 or 40 grams in either direction without meaning anything about your actual trajectory. The useful signal is your 7-day average protein intake compared against your target, since it smooths out that daily noise and reveals whether you are actually falling short over time or just had one off day.

How you space protein across the day also matters more than most people expect. Distributing intake across 3 to 4 meals of roughly 25 to 40 grams each tends to support muscle protein synthesis better than eating the same daily total in one or two large meals, because the body can only make efficient use of so much protein for muscle building in a single sitting. Aiming for a protein-containing meal or snack every 3 to 5 hours is a simple practical rule that gets most people into a reasonable distribution without needing to plan grams meal by meal.

The part that trips people up in practice is the manual math: weighing food, looking up gram counts, and adding it all up by hand every day is tedious enough that most people quietly stop after a week or two. Removing that friction, by logging meals in plain language and letting the macros get calculated automatically, is what actually keeps a protein target sustainable past the first few days.

To turn these ranges into your own number: pick a point in your goal's range based on how aggressive you want to be (closer to 1.6 g/kg for a gentler cut or general health, closer to 2.2 to 2.4 g/kg for an aggressive cut or serious muscle-gain phase), multiply it by your bodyweight in kilograms (or use the per-pound figures directly if you think in pounds), and treat the result as a daily target to hit on average, not a ceiling to avoid crossing. Recalculate it every few weeks as your bodyweight shifts, since a target set for 180 pounds stops being accurate once you are down to 165.

From there, the practical work is consistency: spacing protein across meals, tracking the weekly trend instead of obsessing over one day, and adjusting the target when your goal changes, for example moving from a cut into a maintenance phase. That is the part most static calculators cannot help with, because they give you a number once and stop.