A study which examined the effect of penis dimensions on the likelihood of condom breakage or slippage discovered that the ideal ratio between condom circumference and penis circumference should be from 80 to 90%. In this calculator we provide several condom options, for each penis circumference, which abide this rule. Most condoms fit the average-sized penis, so if your penis is slightly larger than 5 inches when erect, you could wear a “snug” condom just fine. But .
Magnums are roughly 20 percent larger than the regular Trojan Enz condom (you can check out the size chart here). Length: ″ Width: ″ Head Width: ″ To put things in perspective, the average guy is working with a ″ penis, according to this research published in the journal BJU International. Girth is more important than length for condom fit, with girth being the thickest part of the erect penis. There is no absolute rule for who should use the different condom sizes, but the following.