Protein is the macronutrient that most reliably changes body composition outcomes, and the one people most often under-eat while dieting, exactly when it matters most. This calculator sets a daily target from your bodyweight, training and goal.
Educational tool only. Not medical advice. Protein needs vary with health status and kidney function; verify against your own bloodwork and a qualified professional.
When calories are restricted, the body will draw on both fat and muscle for energy. Adequate protein combined with resistance training is what tips that balance toward fat and away from muscle. Cutting protein to make room for other calories while dieting is precisely the wrong trade — check your deficit against the Calorie & TDEE Calculator before you cut anything.
Protein also has the highest thermic effect of the three macronutrients and is the most satiating per calorie, both of which help while eating less.
Total daily intake matters most, but spreading protein across three to five meals rather than concentrating it in one produces a more consistent muscle protein synthesis response. Each meal wants enough leucine to trigger that response, which practically means a solid serving of a complete protein source rather than a token amount. If you are also using a GLP-1, hitting this target matters even more, since appetite suppression makes it easy to fall short without noticing.
Check your current lean mass against your goal with the FFMI Calculator so your protein target actually tracks the muscle you are trying to build or keep.
Research generally supports somewhere around 1.6 to 2.2 grams per kilogram of bodyweight daily for those training to build muscle. Higher intakes are not harmful but show diminishing returns for muscle growth.
Yes. Protein needs rise in a calorie deficit because it protects lean mass while you lose fat. Leaner individuals in aggressive deficits benefit from the higher end of the range.
For healthy people, high protein intakes have not been shown to harm the kidneys or bones. The practical limit is that protein calories displace carbohydrate and fat, which fuel training and hormone production.
Absorption is not the real limit, since the body digests essentially all of it. What plateaus is the muscle protein synthesis response per meal, which is why distributing intake across several meals is more effective than one enormous serving.
It can be, with attention to detail. Plant sources are typically lower in leucine and less complete in amino acid profile, so slightly larger servings and variety across sources are needed to match the equivalent response.
