You weigh 185. The internet says one gram of protein per pound of bodyweight. Easy: 185g a day. Done thinking.
Except that rule was built for gen-pop trainees somewhere between cutting and maintaining, trained three times a week, roughly average in body composition. If you’re a 315-bench strength athlete cutting for summer, that number is low. If you’re a lean endurance-dominant athlete at 165 trying to add size, it might be high. And if you’re a female athlete with 20% body fat doing a hybrid program, there’s no rule-of-thumb that gets you close.
Most protein calculators haven’t caught up to that.
Why ‘1 gram per pound’ is oversimplified
The rule is a legacy of gym-bro math from the 80s. Easy to remember, directionally correct for a big slice of people who train, and errs on the side of “more is fine” because excess protein mostly just costs you money.
But it ignores two things that matter.
First, it uses total bodyweight instead of lean body mass. A 220-lb athlete at 12% body fat needs protein for roughly 194 lbs of lean tissue. The same person at 28% body fat has 158 lbs of lean tissue. The first needs more dietary protein per day. The rule treats them the same.
Second, it ignores training style. A powerlifter and a marathoner at the same bodyweight have different amino acid demands. Heavy resistance training drives different needs than endurance-dominant work, and different still for hybrid athletes who do both hard.
How training style shifts your protein needs
A 2018 meta-analysis in the British Journal of Sports Medicine (Morton et al.) found that protein intake past roughly 1.62 g/kg produced diminishing returns for strength and hypertrophy in trained athletes. That’s the well-lit ceiling. The floor and middle vary based on what you do.
Rough buckets:
- Strength-dominant (heavy compounds, low volume, rest days): 0.9 to 1.1 g/lb of bodyweight, biased high if cutting.
- Hybrid (lifting plus meaningful conditioning): 0.8 to 1.0 g/lb, with a preference for more in higher-volume blocks.
- Endurance-dominant with some lifting: 0.7 to 0.9 g/lb. Timing and total calories matter more than total protein at this end.
- Aggressive cutting: Everyone edges toward the top of their range to preserve muscle. A deficit with low protein is how you end a cut looking smaller and weaker.
These aren’t revolutionary numbers. They’re just less simple than “one gram per pound.”
Body composition matters more than bodyweight
Two 200-lb athletes can have 30 lbs of lean mass between them. The leaner one needs more dietary protein per day to maintain that muscle. The other one needs fewer calories total, but not proportionally less protein.
Most apps don’t ask about this because it’s awkward to estimate body fat by form. What they do instead is round to bodyweight and produce a number that’s 20% off for anyone who isn’t average.
What TrakMac does differently
TrakMac asks questions you’d actually know the answer to. What’s your bench one-rep max? How fast do you run a mile? Can you do a muscle-up? How would you do on a 30-second echo bike sprint?
These aren’t vanity questions. They’re signals. A 225 bench, a 9-minute mile, and “never touched an echo bike” paints a totally different picture than 185 bench, 6:30 mile, and “I’d be competitive on the echo bike.” First one is strength-biased and moderate body fat. Second one is hybrid and lean. The protein target should not be the same.
The app maps those signals onto body-composition and training-style axes, then calibrates your protein target to match. Not a generic formula dressed up in a progress bar.
How to find your real target manually
If you don’t have an app doing the math:
- Estimate body fat honestly. Visible abs at rest means 12 to 14%. Outline of ab definition, 15 to 18%. Vague structure, 19 to 22%. No definition, 23%+.
- Calculate lean body mass: bodyweight times (1 minus body fat %).
- Multiply lean body mass by 1.0 to 1.2 g per pound. That’s your daily protein floor.
- Cutting, stay high. Bulking or maintaining, the middle is fine.
That gets you closer than the one-gram-per-pound shortcut for any body that isn’t average.
Download TrakMac
TrakMac sets protein targets from how you actually train, not just your weight. Download TrakMac free. iOS, available now. More on how the onboarding questions feed the math is in the FAQ.