12-13 inches (30-33cm): Average size; keep it up. 14-16 inches (35-41cm): Bigger than most of your peers including men, definitely turning heads. 16-18 inches (41-46cm): Stacked, you garner attention from people who think you're a bodybuilder. 18-20 inches (46-51cm): New territory, armed and ready to break all records.. In general, no, 13 inch biceps aren't that big for a natural lifter because 13 inches is a normal unflexed bicep size (your flexed measurement should always be bigger than your unflexed measurement). However, circumstantially, a 13 inch bicep circumference can be big. Is 10.5 inch biceps good?

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13 Inch Biceps

Biceps are the muscles on the front of your upper arm — they are considered the "show" muscles. If asked to flex your muscles, you are likely to intuitively flex your biceps. No standards exist in the fitness world for how big your biceps should be. Having "big" biceps is relative to your body frame size and overall musculature.. Yes, the average is around 12-13 inches, but being an inch smaller than average is by no means abnormal. [ 1] Of course, if you're of a standard height, then 11 in biceps will look really skinny, especially if that's your flexed measurement. While you shouldn't be overly concerned with the appearance of your physique, having 11 in arms.