Protein Calculator for Bodybuilding

Bodybuilding pairs the muscle-gain goal with the heaviest training schedule, so this page pre-selects an athlete training level. That lifts the base muscle-gain band of 1.6–2.2 g/kg up by 0.4, landing at 2.0–2.6 g/kg with a recommended midpoint of 2.3 g/kg. The reasoning is arithmetic: daily, high-volume training raises the rate at which muscle protein is broken down and rebuilt, so the daily supply sits toward the top of the healthy-adult range. These are general estimates for healthy adults, not medical advice.

Take a 90 kg lifter. At the recommended 2.3 g/kg midpoint that is roughly 207 g of protein a day, sitting inside a range of 180–234 g. A 200 lb (about 91 kg) lifter lands at about 209 g, in a range of 181–236 g. The two figures are close because 90 kg and 200 lb are close weights — the g/kg factor is identical. Once you have your protein number, build the surrounding carbs and fat with the Macro Calculator, which locks protein in first and splits the rest.

Bodybuilders often carry less fat than average, and that is exactly when the lean-mass method earns its keep. Because protein feeds lean tissue and not fat, working from lean mass gives a sharper number than scale weight. If you know your body fat percentage, work out your lean body mass first, then enter that body fat % here to switch methods; the lean-mass approach uses about 2.3–3.1 g per kg of lean mass. For a very lean trainee the two methods land close together. These figures are general estimates for healthy adults, not medical advice.