I Cup Size Ultimate Guide: What I Cup Boobs Look Like [2023]

One of the largest cup sizes on the market is the I cup size. While it’s rare, there are a lot of women with I cup boobs in the world.

Here, we’ll discuss what exactly it means to be an I cup size, how to measure yourself to check if you’re an I cup, what I cup boobs actually look like, and a lot more about the I cup bra size.

Let’s dive in!

What Does an I Cup Size Mean?

Being an I cup size means that the difference between your bust measurement (measured at the center of your breasts where they’re the largest) and your band measurement (measured right under your boobs) is around 9 inches (23 cm).

We’ll explain this in detail below, but if you just want to find a great I cup size bra, here are the best options:

While this might be unclear at first, we’ll go into detail about what it means and how to measure your cup size.

You may already know that bra sizes are made up of a number and a letter, with the number representing the band size (measured underneath your breasts), and the letter standing for the difference between your bust size and the band size.

Getting the right bra size requires you to measure both the number and letter components correctly. Luckily, this is not as difficult as it might appear.

Measuring your band size is the first step. Wrap a tape measure around your rib cage, right beneath your breasts. Stand straight to ensure an accurate measurement.

If your measurement is an odd number (such as 41), round up to the closest even number (42). This is because bra sizes are typically even numbers.

DO NOT ADD 4 INCHES to your band measurement. There’s an outdated method that says that once you measure your band you should add 4 inches to it. While this was true many years ago, it’s irrelevant now. Yet, this advice can still be seen circling around on the internet. If you stumble upon it, it’s best to ignore it.

Once you have the band size, you need to measure your bust size. You can accomplish this by measuring all the way around your breasts. Rather than measuring underneath them, measure straight across the center of your breasts where they are the biggest.

To sum it up, measuring your bra size involves two measurements: the band size (measured around your chest below your breasts, which is the “number” component), and the bust size (measured where your breasts are largest).

Once you have your band and bust measurements, figuring out your cup size is rather easy. Just subtract your band size from your bust size. If the difference is 1 inch (2.5 cm), your cup size is A. If it’s 2 inches (5 cm), it’s a B cup size, and so on, according to the table below.

Following this, if this difference is 9 inches, your cup size is I.

Let’s illustrate how to determine your bra size with an example. If your band measurement is 40 inches and your bust measurement is 49 inches, your bra size would be 40I.

The difference between your bust size and your band size is 9 inches, which corresponds to an I cup size. And because the band size in the example equaled 40 inches, the number part of the bra size is 40.

Keep in mind that the band measurement will always correspond to the “number” part of the bra size. In the examples we used, we only computed the “letter” part, which is the cup size.

More About the I cup Size

I cup boobs are very large. While this is considered attractive by many people, such large breasts can cause issues such as back pain or neck pain. Also, the choice of bras for the I cup size is not as huge as it is for smaller cup sizes, since this is a relatively rare cup size. Another potential issue is that I cup boobs can lead to objectification and unwanted attention.

What Do I Cup Boobs Look Like (I Cup Breasts Examples)

While all of the above is nice to know, you’re probably wondering what do I cup boobs actually look like. We’ll now look at a few examples of I cup breasts, even though these are relatively rare.

Note that even if two women have the same cup size, their breasts can look different due to their band size. For example, a woman with a band size of 38 inches and a bust size of 47 inches, and a woman with a band size of 42 inches and a bust size of 51 inches will both wear I cup size bras. Still, their breasts will look quite different.

A celebrity who is a I cup size is English model Lucy Collett. She is reportedly a 32I cup size, meaning that her band size is 32 inches, and her bust size is 41 inches.

I Cup Size in Inches

If we measure in inches, an I cup size means that your bust size is 9 inches larger than your band size. This means that if your band measurement is 38 inches, your bust measurement is 47 inches. And if your band measurement is 42 inches, your bust measurement is 51 inches.

I Cup Size in cm

If we measure in centimeters, an I cup size means that your bust measurement is 23 cm larger than your band measurement. This means that if your band measurement is 90 cm, your bust measurement is 113 cm. And if your band size is 100 cm, your bust measurement is 123 cm.

I Cup Size Chart

I Cup Size in UK Sizes

Cup sizes in the US and in the UK are the same for the common cup sizes. However, from DD boobs and larger, cup sizes start to differ.

As stated already, when the difference between the bust and the band is 9 inches, that equals an I cup size in US standards (the same is true for EU standards). In the UK, this same size is referred to as the G cup size.

FAQ

Conclusion

In this article, we dove deep into a cup size considered very large, which is the I cup size. We discussed what it means when someone is an I cup size, how to measure it, what I cup boobs really look like, and many other aspects of this cup size.