Condom Size by Girth: Nominal Width Guide (mm)
Measure erect circumference with a flexible tape and compare it with the manufacturer’s nominal-width guidance. Nominal width is the width of the condom when laid flat, usually given in millimetres on the packet. A conversion formula can offer a rough starting point, but product design and material affect fit, so follow the manufacturer’s instructions.
Quick girth to nominal width reference table
Use brand and product information rather than assuming that ‘regular’, ‘large’ or ‘XL’ means the same width everywhere. For example, Durex UK’s fit guide lists Close Fit at 52.5 mm nominal width, Regular Fit at 56 mm and Wide Fit at 57 mm; individual product pages can list different specifications, so check the exact product before buying. Durex fit guide: https://www.durex.co.uk/blogs/explore-sex/the-durex-condom-buying-guide. Trojan UK also provides its own fit guidance: https://www.trojanbrands.co.uk/sexyinfo/condom-fit-guide/. These are manufacturer recommendations, not a universal girth-to-width formula, and fit still needs to be checked in use.
What is nominal width and where is it printed?
Nominal width is the width of a condom when laid flat, measured in millimetres. Packaging and manufacturer product pages may list it, but the label is not the same as circumference around the penis. When comparing products, check the exact model’s stated nominal width and length rather than relying on the product family name alone.
Why latex stretch matters
Condoms are designed to stretch, but stretch and feel vary with material and product design. Do not rely on a fixed stretch percentage to predict fit or safety; use the product instructions and choose a fit that stays secure without painful tightness.
My Size Report provides a private, calculator-led way to understand measurements against published research. Results are informational and should not be treated as medical advice.