In general, the condoms that you find in the store are meant to be a 'one size fits all' solution and will work for the majority of people. Most standard condoms in North America come with a 7.5 inch length and about 2.1 inch base diameter. So as long as your penis is less than 7.5 inches and fit that diameter, these will work for you. They can be a little snug or not unroll all of the way even though they are down the shaft of the penis all of the way. As long as the condom is tight enough to stay on during sex and can go on comfortably you will be fine. But you may be running into the situation where a loose condom or tight condom is uncomfortable. If this is the case, then you might have to explore other condom sizes. They do commonly come in a range of sizes from XL to snug fit. Enter the dimensions of your penis below to learn what condom sizes and types that are commonly sold would work best for you and give you the best sexual experience:
What are your condom sizes?
Select your penis' length and girth:
(circumference around the penis)
All of these measurements to determine condom sizes should be done while the penis is fully erect, as it would be in a condom. For reference, for a male above the age of 17 the average penis length is 5.17 inches and the average girth is 4.6 inches when the penis is erect. But most men fall into a very large size range and condoms are made to accommodate the average man, so there is a condom out there for you. For a little more on penis size, check out this Men's Health article.