Only 1 in 3 Men Falls in the Regular Condom Size

Our estimate matches what men report. In a study of 436 men, 44.7% said their condoms did not fit well (Crosby et al. 2010). Those men had about 2.6 times the odds of a condom breaking and 2.7 times the odds of it slipping off, and were more likely to lose their erection or take the condom off before sex was over. An earlier study likewise linked reports of tight or loose condoms to breakage and slippage (Reece et al. 2007). If most men are outside the size most shops stock, better information about sizing is a simple public health win.

1. Data: Erect girth from the systematic review by Veale et al. (2015), which pooled studies where a health professional measured the penis. Mean erect girth 11.66 cm, standard deviation 1.10 cm, modelled as a normal distribution.
2. Sizing rule: Condoms are sized by nominal width, the flat width in mm. A secure fit is slightly snug, so we take the ideal nominal width as 87.5% of half the erect girth, rounded to the nearest millimetre. Independent sizing guidance puts a well-fitting condom roughly 5 to 20% narrower than the penis (calcSD), which corresponds to about 83 to 95% of half the girth; 87.5% sits inside that range.
3. Size classes: Typical industry bands (snug 45 to 47 mm, slim fit 47 to 49 mm, regular 52 to 53 mm, large 54 to 56 mm, XL 57 to 60 mm, XXL above 60 mm). Brands differ, so these are representative, not official.
4. Share per class: The share of men whose ideal width falls in each band, read from the girth distribution.

Robustness check: The result does not hinge on one assumption. With a fit rule anywhere from 85% to 90% of half the girth, and even with "standard" defined generously as any width from 52 to 56 mm, the share of men whose ideal width is standard stays between 27% and 37%. About one in three holds across all of these variants.

• Size classes are not standardised. One brand's "large" can be another brand's "regular".
• The fit rule is a guideline. Material, shape and personal preference change what feels right.
• The girth data comes mostly from Western and Middle Eastern study populations and may not represent every country equally.
• At the extremes, the normal-distribution model is less precise than in the middle.

You're welcome to use the chart and figures in articles, videos and social posts. Please credit MaleSizeIndex and link to this page. The data is published under CC BY 4.0.

Condom size chart with example brands →

Calculate your own condom size →

Average girth →