What This Calculator Does
This tool estimates how much protein you should eat each day to support muscle growth. It multiplies your body weight in pounds by a goal-based intensity factor ranging from 0.7 to 1.0 grams of protein per pound. This range reflects widely cited evidence-based recommendations for active individuals seeking to build or preserve lean muscle mass.
How to Use It
Enter your current body weight in pounds, then choose a goal intensity: 0.7 g/lb for maintenance or light training, 0.85 g/lb for moderate muscle gain, or 1.0 g/lb for an aggressive bulk. The calculator returns your daily protein target plus the full recommended low–high range so you can fine-tune intake around training and rest days.
The Formula Explained
The core equation is $$\text{Protein (g)} = \text{Body Weight (lb)} \times \text{intensity factor}$$ The intensity factor \(k\) sits between 0.7 and 1.0. Higher activity, a calorie surplus, or a lean physique goal generally calls for a value closer to 1.0, while lighter training warrants a value nearer 0.7.
Worked Example
Suppose you weigh 180 lb and choose moderate muscle gain (0.85 g/lb). Your daily target is $$180 \times 0.85 = \textbf{153 grams}$$ of protein. Your full recommended range would be \(180 \times 0.7 = 126\) g on the low end and \(180 \times 1.0 = 180\) g on the high end.
FAQ
Should I use total body weight or lean mass? These factors are calibrated for total body weight. If you carry significant excess fat, using lean body mass or a target weight can give a more practical number.
Can I eat too much protein? For healthy individuals, intakes in this range are safe. Going far beyond 1.0 g/lb offers little extra muscle-building benefit for most people.
How should I spread protein across the day? Aim for 3–5 meals, each containing 20–40 g of protein, to maximize muscle protein synthesis throughout the day.
