Check the package for labeled size
Measure the condom’s nominal width in millimeters
Compare nominal width to your penis girth
Use a soft measuring tape around the thickest part of the erect penis
Divide girth by 2 to estimate flat width
Match the measurement to the brand’s size chart
Try a snug fit if standard condoms feel loose
Try a larger size if standard condoms feel tight or break
Check for length if you are very long
Test different brands since sizes vary