Protein Calculator for Bulking

The common mistake on a bulk is to push protein higher simply because total calories are up. It does not work that way. A bulk is a calorie surplus — eating above maintenance so there is spare energy to build tissue — but protein needs scale with body weight, not with how many calories you eat. Muscle-building benefits plateau near the top of the muscle-gain band, so eating far more protein does not add more muscle. This page pre-selects the muscle-gain goal at a moderately active level, giving a band of 1.8–2.4 g/kg, midpoint 2.1 g/kg. The extra calories of the surplus come mostly from carbohydrate and fat. These are general estimates for healthy adults, not medical advice.

Take an 80 kg adult. At the recommended 2.1 g/kg midpoint that is roughly 168 g of protein a day, sitting inside a range of 144–192 g. A 200 lb (about 91 kg) adult lands at about 191 g, in a range of 163–218 g. The two differ only because they are different weights — the g/kg factor is the same, and it is the same muscle-gain factor whether you are gaining, maintaining or cutting. What changes on a bulk is the calorie total around that protein, which you split between carbs and fat with the Macro Calculator.

Because this page fixes protein and not calories, you still need to decide how big the surplus is. Work out your maintenance calories with the TDEE Calculator, add a small surplus on top — a modest one keeps more of the gain as muscle rather than fat — and hold your protein at the figure above. The surplus decides how fast you gain; the protein target decides how much of that gain is muscle. These figures are general estimates for healthy adults, not medical advice.