Free shipping when you spend £50

How To Measure Bra Size

Girl, if this is new to you and you want some hand holding, just call or email us.

So, there are 2 ways to find the right InvisiBra size. Convert your size which is quick and easy. Or, measure yourself. InvisiBra comes in cup sizes A, B, C, D. But it will fit sizes bigger than D. How supportive InvisiBra is depends on how firm your boobs are. The less firm and further your cup size is from D, the less support InvisiBra will give. To get lifted rounded boobs, you should go for a cup that covers about 75% of your boob. Cups that are too big will swamp your boobs and you’ll end up with pancakes! To see this in action, check out our fit guide. Remember that all boobs are unique. Not every 34C boob looks and feels the same. Luckily, InvisiBra comes with a plastic film on the cups to enable you to test for size. You can return and exchange as long as the plastic film stays intact.


At least 80% of women are wearing the wrong size bra. Yea, you heard me, 80%! That means, odds are, you're probably wearing the wrong size too. The wrong size bra can be a real drag. A digging bra is something you don't want to put yourself through day in day out. And you probably won't feel like you're giving your boobs the love they deserve. The good news is that for InvisiBra, a cup that's too small won't cause you any misery. In fact, going for a size smaller can give you better lift.

So how do we measure bra size?

All you need is a tape measure, a few minutes and 5 measurements. Put it into our bra size calculator to find out what your true bra size is. Measure yourself in front of a mirror or get a friend or partner to measure you. And babe, go natural. Don’t wear a bra while measuring.

Measure bra size

1. Underbust

Snug underbust (measurement 1): Measure your underbust (line 1). Hold the measuring tape parallel to the ground and exhale. The tape should be snug, tight enough that it doesn’t move, but not too tight that it digs into your skin.

Tight underbust (measurement 2): Measure your underbust again, but this time, pull the tape as tight as possible & exhale.

2. Standing bust

Measure around the fullest part of your breasts (line 2), make sure the tape goes over your nipples and is parallel to the ground.

3. Leading bust

Lean forward so that your upper body is parallel to the ground and your breasts are hanging. Measure around the body and the fullest part of your breasts. Keep the tape perpendicular to the ground.

4. Lying bust

Lie down on the ground and let your breasts fall naturally to the side. Measure around the body and the fullest part of your breasts, making sure that the tape is as straight as possible.


Please enter your measurements to get estimated sizes. Please not all measurements must be in a unit of inches.

Estimated Bra Size
Estimated UK Size

Please note that our sizing suggestion is advisory only. You should judge the appropriateness of size when you receive the product. Remember not to stick the bra on your skin until you are sure that the size you purchased is right for you as this will affect its eligibility for returns.

Shopping cart

You currently have no items in your cart.

Loading please wait...