The amount of muscle you can gain in a month varies depending on factors such as your training experience, genetics, diet, and workout intensity. Here's a general guideline:

Beginner

• Potential Muscle Gain: 1–2 pounds (0.5–1 kg) per month.

• Beginners gain muscle more quickly due to a phenomenon called "newbie gains." Their bodies are highly responsive to resistance training.

Intermediate

• Potential Muscle Gain: 0.5–1 pound (0.25–0.5 kg) per month.

• As you progress, your body's rate of muscle gain slows down because it becomes harder to stimulate new growth.

Advanced

• Potential Muscle Gain: 0.25–0.5 pounds (0.1–0.25 kg) per month.

• Advanced lifters need highly optimized routines and diets to see even modest gains.

Key Factors

1. Training: Progressive overload (increasing resistance or intensity over time) is crucial.

2. Diet: A calorie surplus with sufficient protein (around 1.6–2.2 grams per kg of body weight) supports muscle growth.

3. Recovery: Proper sleep (7–9 hours) and rest between workouts are essential for muscle repair and growth.

4. Consistency: Regular, structured training yields better results than sporadic effort.

Realistic Expectations

While some claim higher gains, much of this can include water weight, glycogen storage, or even fat gain, especially if you're bulking aggressively. Sustainable muscle growth is better achieved over months or years rather than weeks.