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 this baseline number, set as the Recommended Dietary Allowance (RDA), is designed to prevent deficiency in sedentary adults. It’s not optimized for building muscle, losing fat, aging well, or any of the goals that probably brought you here.
The Baseline vs. What Most People Actually Need
The RDA of 0.8 g/kg/day supplies as little as 10% of total daily calories for a relatively active person. That’s enough to keep your body functioning, but it leaves a lot on the table if you’re physically active or over 65. Protein should account for 10% to 35% of your daily calories, and most people benefit from landing in the middle or upper end of that range rather than scraping the bottom.
To find your baseline in grams, divide your weight in pounds by 2.2 to get kilograms, then multiply by 0.8. A 180-pound person (about 82 kg) would need a minimum of 65 grams per day. From there, your actual target depends on your activity level, age, and goals.
Protein for Building Muscle
If you exercise regularly, especially with resistance training, your protein needs roughly double the RDA. Active adults benefit from 1.4 to 2.0 grams per kilogram of body weight per day. For that same 180-pound person, that’s 115 to 164 grams daily. Spreading this across meals matters too: aiming for 20 to 40 grams per meal gives your muscles a consistent supply of amino acids to work with throughout the day.
There’s a ceiling to how much protein your muscles can use in one sitting. Research shows that about 30 grams of protein in a single meal is enough to maximally stimulate muscle building, and consuming much more than that in one go doesn’t produce a proportionally bigger response. Studies on leg lean mass and strength found the strongest results in people who regularly ate meals containing 30 to 45 grams of protein. So three or four protein-rich meals tend to outperform one or two massive ones, even if the total daily intake is the same.
Protein for 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. Higher protein intake acts as a buffer against that muscle loss. Current recommendations for people cutting calories while staying active range from 1.6 to 2.4 grams per kilogram per day. For trained athletes in a serious calorie deficit, some research supports going as high as 2.7 g/kg/day, though intakes above roughly 2.4 g/kg/day are unlikely to provide additional muscle-sparing benefits.
For a 160-pound person (73 kg) dieting to lose fat, that means roughly 117 to 175 grams of protein per day. This is significantly more than the RDA, but it’s what the evidence supports for preserving the muscle you’ve built while shedding body fat. Keeping protein high also tends to reduce hunger, which makes sticking to a calorie deficit easier.
Protein Needs After 65
Nearly half of all protein in your body is found in muscle, and muscle mass naturally declines with age. This process, called sarcopenia, accelerates after 65 and can lead to frailty, falls, loss of independence, and hospitalization. Getting too little protein makes it worse.
Researchers recommend that older adults consume 1.0 to 1.2 grams of protein per kilogram of body weight, a meaningful step up from the standard 0.8 g/kg. For a 150-pound older adult (68 kg), that translates to 68 to 82 grams per day. Because older muscles are less responsive to small doses of protein, hitting that 30-gram-per-meal threshold becomes even more important with age. A breakfast of toast and coffee with a splash of milk won’t cut it.
Protein During Pregnancy
Pregnant women should aim for a minimum of 60 grams of protein per day, which typically accounts for 20% to 25% of total calorie intake. This supports fetal development, placental growth, and the increased blood volume that pregnancy demands. Many women who were already active or eating well before pregnancy may need more than this minimum, particularly in the second and third trimesters as the baby grows rapidly.
Plant-Based Protein: Quality Differences
Not all protein is created equal. Animal proteins contain higher levels of essential amino acids, particularly leucine, which is the amino acid most directly responsible for triggering muscle building. A lean beef patty contains roughly 2.2% leucine by weight, compared to about 1.35% for an Impossible Burger and 1.69% for a Beyond Burger. Animal proteins also tend to be more digestible, meaning your body absorbs and uses a higher percentage of what you eat.
This doesn’t mean plant-based diets can’t meet your protein needs, but it does mean you’ll likely need a higher total intake and a wider variety of sources. Beans, lentils, tofu, tempeh, nuts, and seeds each have different amino acid profiles. Eating a range of these throughout the day fills in the gaps that any single plant source would leave. If you’re plant-based and training hard, aiming for the higher end of the protein range (closer to 2.0 g/kg) is a reasonable hedge against lower digestibility and amino acid completeness.
How to Spread Protein Across the Day
Your body builds and repairs muscle around the clock, not just during your post-workout window. The most effective approach is distributing protein relatively evenly across three or four meals, with each meal delivering at least 30 grams. This keeps amino acid levels elevated and gives your muscles repeated opportunities to rebuild.
In practical terms, 30 grams of protein looks like a chicken breast the size of a deck of cards, a cup of Greek yogurt with a handful of nuts, four eggs, or a generous scoop of protein powder. Most people front-load carbohydrates at breakfast and back-load protein at dinner. Rebalancing so that breakfast and lunch each carry their weight in protein is one of the simplest changes you can make to hit your daily target without relying on an enormous dinner.
Quick Reference by Goal
- Sedentary adult (minimum): 0.8 g/kg/day
- Active adult or regular exerciser: 1.4 to 2.0 g/kg/day
- Weight loss while preserving muscle: 1.6 to 2.4 g/kg/day
- Adults over 65: 1.0 to 1.2 g/kg/day
- Pregnancy: minimum 60 g/day
To convert your weight: divide pounds by 2.2 to get kilograms, then multiply by the appropriate range. A 200-pound active adult (91 kg) aiming for 1.6 g/kg would target about 145 grams per day. Protein should make up 10% to 35% of total calories, and for most people with fitness or health goals, landing between 20% and 30% is the sweet spot.