The size word on a condom box is marketing. The number is engineering. A "large" from one brand can be narrower than a "standard" from another, and the only way to compare across brands is the nominal width in millimeters, which most boxes print in small type or not at all. This page collects those numbers in one chart so you can shop by measurement instead of by adjective.
If you have not measured yet, start with the condom size calculator. It takes two minutes with a soft tape and gives you the one number this chart needs.
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How the matcher works
Enter your girth (or your nominal width directly, if you already have it) and we convert it to a target nominal width, place it in a fit band, and list the products from the chart below whose published width is within about 2 millimeters of your number, nearest first. That tolerance is deliberate: manufacturing spec, latex stretch, and chart-to-chart disagreement mean a millimeter either way is a fair game, and shape often matters as much as the last millimeter of width.
The formula
Girth is your erect circumference at the thickest point, converted to millimeters (1 inch = 25.4 mm, 1 cm = 10 mm). Nominal width is the flat-lay width printed on condom packaging under ISO 4074 labeling.
Worked example
The chart: nominal width by brand
Widths are compiled from published brand and retailer size charts as of July 2026. Brands revise products and specs, so treat this as a well-sourced starting point and check the box before you rely on it. Fit bands match our calculator: snug under 49 mm, standard 49 to 54 mm, large 55 to 60 mm, extra large over 60 mm. Product names link to Amazon search results for that product line.
| Condom | Nominal width | Band |
|---|---|---|
| Lifestyles Snugger Fit | 49 mm | Standard (snug end) |
| Glyde SlimFit | 49 mm | Standard (snug end) |
| Caution Wear Iron Grip | 49 mm | Standard (snug end) |
| Okamoto Beyond Seven | 51 mm | Standard |
| Durex Invisible | 52 mm | Standard |
| Kimono MicroThin | 52 mm | Standard |
| Okamoto Crown Skinless Skin | 52 mm | Standard |
| Sustain Ultra Thin | 52 mm | Standard |
| Trojan ENZ | 53 mm | Standard |
| Trojan Ultra Thin | 53 mm | Standard |
| Skyn Original | 53 mm | Standard |
| Durex Extra Sensitive | 54 mm | Standard |
| Kimono MAXX | 54 mm | Standard |
| Trojan Magnum | 55 mm | Large |
| Trojan Magnum Thin | 55 mm | Large |
| Skyn Large | 56 mm | Large |
| Lifestyles KYNG | 56 mm | Large |
| ONE The Legend | 56 mm | Large |
| Glyde Maxi | 56 mm | Large |
| Durex XXL | 57 mm | Large |
| Okamoto Beyond Seven Mega Big Boy | 57 mm | Large |
| Trojan Magnum XL | 58 mm | Large |
| Trojan Supra (non-latex) | 58 mm | Large |
| MyONE Custom Fit | 45 to 64 mm | All bands |
| My.Size | 47 to 72 mm | All bands |
Product links go to Amazon search results, not specific listings, so you see current options and prices. As an Amazon Associate, we earn from qualifying purchases.
Marketing names versus millimeters
Three honest observations fall straight out of the chart. First, the famous Magnum is only about 2 mm wider than a regular Trojan ENZ (55 versus 53), so if a Magnum "fits" and a regular "does not," the difference is probably shape and headroom, not the width the branding suggests. Second, the narrowest mainstream condoms bottom out at 49 mm, which by the math fits a girth of about 3.9 inches; if your number is below that, the big brands simply do not make your size and the custom-size brands are not a gimmick, they are the only correct answer. Third, "large" starts earlier than most people think: 55 mm corresponds by the half-girth rule to a girth of about 4.3 inches, and in the clinician-measured data on our average size chart most men measure at or above that line. Latex stretches, which is why standard widths still work for many of them, but needing a large condom is common, unremarkable, and worth exactly zero drama in either direction.
If nothing on the chart works
Try a different shape in your width before a different width: straight-walled, contoured, and flared-head condoms at the same nominal width can feel completely different. If pain or persistent discomfort continues across sizes, shapes, and brands, that is worth discussing with your doctor. And if your number falls outside 45 to 72 mm entirely, measure again carefully first, since measurement error is far more common than a genuinely out-of-range size.
Related tools: the condom size calculator, the percentile calculator, and the visualizer.
This page is for general information and educational purposes only and is not medical advice. Sizing follows ISO 4074 nominal-width labeling; widths are from published brand and retailer charts as of July 2026 and individual products vary.