I think it depends on body type, weight, and height.
For smaller body types, anything over 40 is big. For bigger guys, 45-50+ will be considered big. At the same time, body fat in other muscle groups like shoulders and waist will make a big chest look small.
For example, at 6'2", I have a 53-54 inch chest, but a rather large waist, at 310lbs. If it wasn't for me being an endomorph, I would look like a BoohBah. Once I loose this fupa I got around my hips, my chest, back, and shoulders sizes will be more noticeable. Not to mention that sweet "v" taper, but I got some work to do before that.
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