How to Measure Your Bra Size: A Step-By-Step Guide

70% of women wear the wrong bra size. Yes, that’s right. That sure is a lot of women wearing the wrong bra! There's obviously a lot of confusion out there about how to measure your bra size. Not only is wearing the wrong size uncomfortable, but it also leads to bad posture and an overall unflattering shape.

In this quick read, you'll learn how to find your correct bra size so you can have the right support and go about your day without feeling uncomfortable around your chest area.

What You Need

To find the right bra size, we’re going to need 3 things.

Tape measure
The best-fitting non-padded wired bra
Pen and paper to write down your measurements

Are you all set? Let’s go!

How to Measure Your Bra Size Correctly

Step 1: Determine your band size

Wrap the tape measure around your rib cage, positioning it under your bust. Make sure the measuring tape is snug but not dig into the skin. Now that you have the measurement, round it to the nearest whole number. If the number is even, add 4 inches. If the number is odd, add 5. Example: If your band size is 31, which is an odd number, add 5. So your band size is 36.

Step 2: Measure your bust size

Wrap the tape measure from behind over to the fullest part of your breast and ensure that the tape is parallel to the floor. This measurement is usually across the nipple. Make sure that it rests comfortably around your breast and that it’s not too tight or loose.

Step 3: Find your cup size

This step requires some calculation so you'll need to put your thinking cap on. Bust size minus band size equals your cup size. As simple as that.

For example, if your bust size is 38 inches and your band size is 36 inches, then 38-36=2. Based on the chart below, you are a B cup.

Note that this chart uses US cup sizes.

Your bra size is your band size plus your cup size. Example: 36B

For an easier computation of your bra size, you can use our calculator here.

How to Choose the Right Ultra Boost Size

Now that you have measured your bra size, please take a look at the table below to choose the correct size for your BOOMBA inserts. We recommend sizing up in your bikini to accommodate the boobage (BOOMBA insert).

Please note that Demi Boost, Perfect Boost, and Invisible Lift are one size fits A to D while Ultra Boost Inserts come in different sizes.

BRA SIZE

US	AU/NZ	UK	EU	ES/FR	IT	BOOMBA BRA SIZE
28A	6A	28A	60A	75A	00A	AA
30A	8A	30A	65A	80A	0A	AA
32A	10A	32A	70A	85A	1A	AA
34A	12A	34A	75A	90A	2A	A
36A	14A	36A	80A	95A	3A	B
38A	16A	38A	85A	100A	4A	C
40A	18A	40A	90A	105A	5A	D
42A	20A	42A	95A	110A	6A	E
44A	22A	44A	100A	115A	7A	F

28B	6B	28B	60B	75B	00B	AA
30B	8B	30B	65B	80B	0B	AA
32B	10B	32B	70B	85B	1B	A
34B	12B	34B	75B	90B	2B	B
36B	14B	36B	80B	95B	3B	C
38B	16B	38B	85B	100B	4B	D
40B	18B	40B	90B	105B	5B	E
42B	20B	42B	95B	110B	6B	F

28C	6C	28C	60C	75C	00C	AA
30C	8C	30C	65C	80C	0C	A
32C	10C	32C	70C	85C	1C	B
34C	12C	34C	75C	90C	2C	C
36C	14C	36C	80C	95C	3C	D
38C	16C	38C	85C	100C	4C	E
40C	18C	40C	90C	105C	5C	F

BRA SIZE

US	AU/NZ	UK	EU	ES/FR	IT	BOOMBA BRA SIZE
28D	6D	28D	60D	75D	00D	A
30D	8D	30D	65D	80D	0D	B
32D	10D	32D	70D	85D	1D	C
34D	12D	34D	75D	90D	2D	D
36D	14D	36D	80D	95D	3D	E
38D	16D	38D	85D	100D	4D	F

28DD/E	6E	28DD	60E	75E	00DD	B
30DD/E	8E	30DD	65E	80E	0DD	C
32DD/E	10E	32DD	70E	85E	1DD	D
34DD/E	12E	34DD	75E	90E	2DD	E
36DD/E	14E	36DD	80E	95E	3DD	F

28DDD/F	6F	28E	60F	75F	00E	C
30DDD/F	8F	30E	65F	80F	0E	D
32DDD/F	10F	32E	70F	85F	1E	E
34DDD/F	12F	34E	75F	90F	2E	F

28G	6G	28F	60G	75G	00F	D
30G	8G	30F	65G	80G	0F	E
32G	10G	32F	70G	85G	1F	F

28H	6H	28FF	60H	75H	00FF	E
30H	8H	30FF	65H	80H	0FF	F

28I

28G

60J

75J

00G

How to Know If You Have the Right Bra Size

Once you’ve figured out your correct bra size, how do you know that it fits you perfectly? There’s only one way to find out. Test it! Make sure you try on different bras from different brands, as sizes can differ between brands.

Here’s a bra checklist:

The straps should stay on your shoulders and not pinch or dig in your skin.
The band should be snug enough but not too tight.
The underwire should sit comfortably under your bust.
The area between the cups should be flat, and only one finger can slide underneath it. Otherwise, it’s too loose.
The cups should fully cover your bust with no spillage on the sides or over the top.

Conclusion

Finding your correct bra size may be tricky, but doable. Our step-by-step guide ensures that you determine your perfect fit, so you can shop for bras with confidence.

Finally found your perfect size? Now you can buy your favorite BOOMBA product with no doubt! If you still need assistance, please send us an email or DM us and we would be glad to help.