Condom size calculator

Measure your girth, the distance around the thickest point of the shaft while erect, with a soft tape or a strip of paper you then hold against a ruler. Enter that number above and the calculator maps it to a nominal-width band and the condoms in it. It takes a minute and you only do it once.

Nominal width is the condom laid flat, and doubled it is roughly the girth the condom is built for. It is the number that decides whether a condom grips or slips. Length barely matters, because a condom unrolls longer than almost anyone needs, so it is width, set by your girth, that the calculator works from.

Six inches is a length, and length is not what sizes a condom. Almost every condom sold in Australia unrolls past 160mm, well beyond six inches, so length rules very little in or out. Measure your girth instead, around the thickest point, and size on that.

Snug the whole way down without pinching, and it should reach close to the base and stay there. If it slips, rolls or bunches, the width is too big and you want a narrower band. If it pinches, feels tight at the base or is a struggle to unroll, the width is too small and you want a wider one.

Firm enough that it will not move on its own, not so tight that it is uncomfortable or hard to roll down. A condom that leaves deep marks or feels constricting is too narrow; one you can slide up and down freely is too wide. The right width sits in between, held in place by the girth it was built for.

Standard is a nominal width of about 52 to 56mm, which is what most condoms sold in Australia are built to and what suits a measured girth of roughly 110 to 125mm. Narrower than that is the snug band, wider is large, and past 60mm is extra large.

Neither. Condoms stretch, so girth ÷ 2 understates the width you actually want. The girth-to-width mapping here is a reviewed table built from how real condoms fit, which is why a measurement beats a guess or a sum.