Bra Size Calculator

Bra Size Calculator: How to Measure Your True Bra Size

When it comes to finding the perfect bra, size truly matters. Wearing the wrong size can cause discomfort, posture problems, and even health issues. In this guide, I’ll walk you through how to use a bra size calculator, measure yourself at home, and convert your size for different countries. We’ll also explore sister sizes and key tips for the best bra fit.

How to Measure Your Bra Size at Home

Measuring your bra size might sound complex, but it’s actually pretty simple if you follow a few easy steps. Here’s how I do it:

Step-by-Step Guide

1. Measure your band size: Take a tape measure and wrap it snugly around your ribcage, right under your bust. Ensure the tape is level all around. This is your band size. If you get an odd number, round down to the nearest even number. 2. Measure your bust size: Now, wrap the tape measure around the fullest part of your bust, ensuring it’s level and snug. This will give you your bust measurement. 3. Calculate your bra size: To find your cup size, subtract your band measurement from your bust measurement. The difference corresponds to your cup size (e.g., a 1-inch difference is an A cup, 2 inches is a B cup, and so on).

Common Mistakes in Bra Sizing

Over the years, I’ve learned that people make a few common errors when measuring their bra size. The two biggest mistakes are taking an inaccurate band measurement and not understanding how cup sizes work. Make sure your measurements are tight and precise.

The Importance of Wearing the Right Bra Size

Wearing the correct bra size is crucial for your comfort and health. Not only does it ensure proper support, but it can also enhance your posture and confidence.

Benefits of Correct Bra Size

The right bra size helps distribute the weight of your breasts evenly, providing optimal support. A well-fitted bra can prevent back and shoulder pain while also giving you a more flattering silhouette.

Problems with Wearing the Wrong Bra Size

If you’re wearing a bra that’s too tight or too loose, it can lead to several issues. Tight bands can dig into your skin, causing discomfort, while loose bras fail to support your breasts, leading to strain on your back and shoulders. You may even experience headaches and skin irritation over time.

Bra Size Conversion Charts

Depending on where you shop, bra sizes can vary. Here’s how you can convert your size between different countries.

Band Size Conversion

Use this chart to find your band size in the UK, US, Europe, and other regions:

Band Size	FR/BE/ES	EU (Standard EN 13402)	US and UK	AU, NZ
XXS	75	60	28	6
XS	80	65	30	8
S	85	70	32	10
M	90	75	34	12
L	95	80	36	14
XL	100	85	38	16
XXL	105	90	40	18
3XL	110	95	42	20
4XL	115	100	44	22
5XL	120	105	46	24

Bust/band difference in inches	US cup size	UK/AU cup size
<1	AA	AA
1	A	A
2	B	B
3	C	C
4	D	D
5	E or DD	DD
6	F or DDD	E
7	G or DDDD	F
8	H	FF
9	I	G
10	J	GG
11	K	H
12	L	HH
13	M	J
14	N	JJ

Bust/band difference in cm	Continental Europe cup size
10-11	AA
12-13	A
14-15	B
16-17	C
18-19	D
20-21	E
22-23	F
24-25	G
26-27	H
28-29	I
30-31	J
32-33	K

Sister Bra Sizes

Did you know that bra sizes can vary slightly from brand to brand? This is where sister sizes come into play. Sister sizes are alternative bra sizes with the same cup volume but a different band size. For example, if you wear a 34C, you might also fit into a 32D or a 36B.

What Are Sister Sizes?

Sister sizes allow you to experiment with different band sizes while keeping the cup size consistent. This can be helpful if you’re in between sizes or can’t find your exact size.

How to Find Your Sister Size

To find your sister size, try going up or down a band size while adjusting the cup size in the opposite direction. If you need a tighter band, go down a size and increase the cup size. If you need a looser band, go up a size and decrease the cup size.

Tips for Finding the Perfect Bra

Finding the right bra involves more than just the correct size. Here are a few tips to ensure the best fit:

The Band

The band should be snug around your ribcage without feeling too tight. When buying a new bra, it’s best to fasten it on the loosest hook so that you can tighten it as the bra stretches over time.

The Straps

Adjust the straps so they rest comfortably on your shoulders without digging in. The straps should provide minimal support, as most of the bra’s support comes from the band.

The Cups

Make sure the cups fully encompass your breast tissue. If there’s any gaping or spillage, you might need to try a different style or size. Different bra styles (like full coverage, demi, or plunge) fit differently depending on breast shape.

International Bra Size Differences

If you’re shopping for bras internationally, keep in mind that sizing can differ across regions. Here’s how some of the main regions compare:

UK vs US Bra Sizes

The UK sizing system is considered more accurate, especially for larger cup sizes, compared to the US, which often stops at DD cups. In the UK, cup sizes can go much higher, catering to a broader range of sizes.

European vs Asian Bra Sizes

European sizes tend to be similar to UK sizes, while Asian sizes may run smaller in both band and cup measurements. It’s important to always refer to size conversion charts when shopping across borders.

FAQ: Common Questions About Bra Sizes

If you’re unsure about anything, here are a few common questions I’ve come across:

How Often Should I Measure My Bra Size?

Your bra size can change over time due to factors like weight fluctuations, pregnancy, or hormonal changes. I recommend measuring your size every six months to ensure the best fit.

What Are the Signs of an Ill-Fitting Bra?

If your bra straps are constantly falling down, your band is riding up, or you have gaping cups, it’s time for a new size. These are telltale signs that your current bra no longer fits properly.

Can I Use a Bra Size Calculator for Sports Bras?

Yes, the same measurements apply, though sports bras can vary in style (compression vs encapsulation). Knowing your exact size will help you choose the right sports bra for maximum support.

Bra Size Calculator