For a bulk, aim for 1.6 to 2.2 grams of protein per kilogram of body weight per day. For a 180-pound (82 kg) person, that works out to roughly 130 to 180 grams daily. This range is backed by a large meta-analysis of 49 studies published in the British Journal of Sports Medicine, which found that muscle gains from resistance training plateaued at 1.62 g/kg/day, with the upper confidence interval reaching 2.2 g/kg/day.
The Target Range and Why It Exists
The International Society of Sports Nutrition recommends 1.4 to 2.0 g/kg/day for most exercising individuals looking to build or maintain muscle. The meta-analysis data suggests a sweet spot around 1.6 g/kg/day for the average lifter, but because individual responses vary, pushing closer to 2.2 g/kg/day covers nearly everyone. Eating at the standard dietary recommendation of 0.8 g/kg/day is clearly insufficient for anyone training to gain size.
The good news during a bulk is that your caloric surplus works in your favor. Extra calories have a “protein-sparing” effect, meaning your body is less likely to burn protein for energy when carbs and fats are plentiful. This is why protein needs are actually higher during a cut (some recommendations go as high as 2.3 to 3.1 g/kg/day when calories are restricted) and somewhat more forgiving during a surplus. Hitting 1.6 g/kg/day consistently while bulking is likely enough for most people; the 2.2 g/kg figure is a sensible ceiling if you want extra insurance.
How Much Protein Per Meal
Your body can use more than the often-cited “30 grams per meal” figure, but there are practical limits. Research on young men found that muscle protein synthesis peaks with about 0.25 g/kg per meal, which translates to roughly 20 to 25 grams for most people. Adding a safety margin, the practical recommendation lands at about 0.4 g/kg per meal, or roughly 30 to 40 grams of protein per sitting.
Going above 40 grams in a single meal isn’t wasted entirely. Some of those extra amino acids still get used for tissue repair, but you hit diminishing returns. A study comparing 20-gram and 40-gram doses of whey protein after leg training found the higher dose produced only an 11% greater absolute increase in muscle protein synthesis, not the doubling you’d expect from twice the protein.
For most people on a bulk, spreading protein across four meals of 30 to 40 grams each is more effective than cramming it into two large meals. Spacing those feedings about 3 to 4 hours apart keeps your body in a favorable state for building muscle throughout the day.
What Makes a Protein Source “High Quality”
Not all protein sources trigger the muscle-building process equally well. The key factor is leucine, an amino acid that acts as the signal telling your muscles to start synthesizing new protein. You need roughly 2.5 to 3 grams of leucine per meal to flip that switch effectively. Animal proteins like chicken, beef, eggs, fish, and dairy are naturally leucine-rich: a typical 30-gram serving of whey protein delivers about 3 grams of leucine. Plant proteins tend to be lower in leucine, so if you’re relying on sources like beans, lentils, or tofu, you’ll generally need a larger serving or a combination of sources to hit the same threshold.
Pre-Sleep Protein
One often-overlooked feeding window is right before bed. Research on slow-digesting casein protein (the main protein in milk and cottage cheese) shows that consuming 40 to 48 grams about 30 minutes before sleep improves overnight muscle recovery and protein metabolism. In one study, healthy young men who consumed 40 grams of casein before bed after evening resistance training digested and absorbed it well throughout the night. Studies using only 30 grams didn’t produce the same benefits, so the dose matters here. A cup or two of cottage cheese, a casein shake, or Greek yogurt before bed is a practical way to get this in.
A Quick Reference by Body Weight
- 150 lbs (68 kg): 109 to 150 g protein per day
- 170 lbs (77 kg): 123 to 170 g protein per day
- 190 lbs (86 kg): 138 to 190 g protein per day
- 210 lbs (95 kg): 152 to 210 g protein per day
These ranges use the 1.6 to 2.2 g/kg framework. If you’re significantly overweight, base your calculation on lean body mass or your goal weight rather than your current weight, since excess fat tissue doesn’t increase your protein needs.
Is Very High Protein Intake Safe?
Some lifters push protein well above 2.2 g/kg/day, sometimes exceeding 3.0 g/kg. There is some evidence that intakes above 3.0 g/kg may help with body composition in trained individuals, potentially by promoting fat loss rather than additional muscle gain. For healthy people with normal kidney function, high-protein diets are not associated with kidney damage or other medical problems. However, if you have existing kidney disease, high protein intake can worsen kidney function.
From a practical standpoint, protein above 2.2 g/kg/day during a bulk is unlikely to build meaningfully more muscle. Those calories could go toward carbohydrates, which fuel your training and support recovery. Most people will get better results by hitting the 1.6 to 2.2 g/kg range consistently and putting the rest of their caloric surplus toward carbs and fats rather than chasing extremely high protein numbers.