How much muscle you can realistically gain
Two published models, your body weight and training age in, a timeline out: the next 6 months, 1 year, 3 years, and 5 years. Each row links to the transformation that shows it.
The two models
McDonald
Lyle McDonald's table gives a man about 20–25 lb of muscle in his first year of proper training, 10–12 lb in the second, 5–6 lb in the third, and 2–3 lb a year after that. Women are roughly half. The calculator starts you at your current year and adds the years ahead.
Aragon
Alan Aragon frames the same curve as a share of body weight per month: 1–1.5% for beginners, 0.5–1% for intermediates, 0.25–0.5% for advanced lifters. Heavier people gain more in absolute terms, which is why the calculator asks for your weight.
What to do with the number
- Under a year in: eat in a small surplus and lift progressively. This year is the biggest jump you will ever get. See 1 year later.
- Two to four years in: growth is slow enough that body fat decides how you look. Compare lean bulk with 12% body fat.
- Four years or more: you are near the ceiling. The natural limit calculator estimates it and Genetic maximum shows it.
Questions
How much muscle can a beginner gain in a year?
Lyle McDonald's model puts a man's first year of proper training at 20–25 lb of muscle, and Alan Aragon's at 1–1.5% of body weight per month, which lands in the same place for most people. Women gain roughly half as much in absolute terms.
Why does the rate drop every year?
Muscle gain is fastest when you are furthest from your genetic ceiling. Year two is about half of year one, year three about half again, and from year four most natural lifters add only a few pounds a year no matter how well they train.
Do casual years count as training age?
No. The models assume consistent, progressive training with enough food and sleep. Years of showing up without progressing do not use up beginner gains, which is why people who start training properly after years of casual lifting often grow like beginners.
See a year of muscle on your body.
Get the app, upload one photo, and see this transformation rendered on your own frame.
