15 Inch Arms by Weight
How much you weigh also factors into how big your arms look on your body. For example, 15 inch arms look much bigger on a 150lb guy than a 250lb guy.
In other words, the heavier you are, the bigger your arms need to be to look impressive. Obviously, you want that weight to be muscle, not fat. I’ll get into that in a minute.
15 Inch Arms by Height
Finally, your height also plays a role in how big your arms look.
To illustrate, picture a 5’6” person standing next to a 6’6” person. If they both have 15 inch arms, the short guy’s arms will look much bigger.
So the taller you are, the bigger your arms need to be to look impressive.
Arm Size Calculator
Height, weight, and age make it difficult to know if your arms are considered big. Fortunately, there are equations to predict average arm size based on these variables.
I created a simple calculator that shows you if your arms are big or small for your demographic.