USA | CAN | INTL

Get help shopping! 1-855-521-4244 (Toll-free US & CAN)


How to measure your bra size

A woman can go through as much as six different size changes throughout her life. These changes may be due to fluctuations in pregnancy, weight, use of birth control pills, menopause, stress and other reasons. In my experience, close to 90% of women wear the wrong bra size! Here is your guide to measuring your bra size with a measuring tape.

To find the perfect bra it is important to know your size or approximate size and to estimate what style bra is most convenient for you (not sure? Just ask me!). It is equally important to consider that sizing standards from one manufacturer is not the same standard as another, and sizes may not be exactly the same depending on the brand; for example, European brands make sizes that often run smaller than their equivalent American and Canadian sizes. Also, some bras (even in the same brand) may be made smaller than others, even in the same size; sizing may vary depending on factors like the elasticity of the fabric used, the width of the underwire, the style of the bra, etc. So as you read below, keep in mind that this is not a complete fix to finding your bra size (i.e. may not be 100% accurate), just how to measure your size based on several North American companies' sizing guidelines. Read below for the steps on measuring.

Still need bra fitting help? Contact me with your specific bra fitting problems or questions and I can help by explaining how to fix them.

Your band size is numerical and represents the circumference of your rib cage. The numbers 30, 32, 34 and so on are known as the underbust measurement because it is taken from underneath your bust and around your rib cage.

Your cup size is represented by a letter which in turn represents the "depth" of your bust. (However, you may find that you don't necessarily have a "deep" or "full" breast, but that your breast is wide and necessitates a style with a wider underwire to accommodate this. For some styles/brands this may translate to needing to take a D cup bra instead of a C cup bra (as long as there are no gaps between your breasts and the bra cups' fabric.) The letters A,B,C and so on are obtained from the difference between your overbust measurement, which is taken around the fullest part of the bust,and the underbust measurement.

Step One - Measuring Your Band Size

This may be helpful to do with a friend, your mom or your sister - or just in front of the mirror.

With a properly fitting bra on (try to avoid excessive padding), use a standard dressmaker's measuring tape. Measure snugly around your rib cage (your "underbust"; below your shoulder blades in back) while keeping the tape as straight as possible.

This may be helpful to do with a friend, Add 5 to that number. Once you add the 5, if the number is even then that is your Band Size. If the number is odd round up to one. If, let's say, it's 31, then add 1 to make it even, and it becomes 32. The best idea is to measure in inches, since that's the North American industry standard.

Ribcage Add 5" Imperial Size Metric Size
27" +5" 32" 70cm
29" +5" 34" 75cm
31" +5" 36" 80cm
33" +5" 38" 85cm
35" +5" 40" 90cm
37" +5" 42" 95cm
39" +5" 44" 100cm

Step Two - Cup Size

Still using the same tape measure and with your bra still on,place the tape measure under your arms and around the fullest part of your bust (typically below the level of your nipples, or at your nipples).

Subtract the final number obtained from Step 1 above (your rib cage measurement), from the number you just obtained here in Step 2. E.X. Step 1 = 38, Step 2 = 42. 42 - 38 = 4 (a number equivalent to a cup size).

Take a look at the chart below to show you the equivalent conversion. For example, 4 Converts to D cup.

Note that in the table below there IS some minor ambiguity. For example, if the difference (between your rib cage measurement and the fullest part of your bust) is exactly 1", then you may fall into either the A or the B cup categories. When this is the case, the sizes are (mostly) interchangeable - you are probably right between an A or B cup. Always go up a size when you`re right between like the case here, otherwise the bra cup risks being too small around your breasts. As mentioned before, this is not a 100% foolproof way to fit a bra, especially since all bras fit differently, and two women measured at a 36C may not be the same shape or require the same type of bra.

Difference 0" TO 1/2" 1/2" TO 1" 1" TO 2 1/2" 2 1/2" TO 3 1/2" 3 1/2" TO 4 1/2" 4 1/2" TO 6" 6" TO 7" 7" TO 8" 8" TO 9" 9" TO 10" Over 10"
Cup Size AA A B C D DD & E E & F G H I J and Up

Of course, if you're still having trouble fitting your bras, contact me for quick and confidential help any time!

International Bra Band Size Conversions
USA UK Euro/Jap Fr/Belg/Spain Italy/Czech Australia
30 30 65 80 0 8
32 32 70 85 1 10
34 34 75 90 2 12
36 36 80 95 3 14
38 38 85 100 4 16
40 40 90 105 5 18
42 42 95 110 6 20
44 44 100 115 7 22
46 46 105 120 8 23
48 48 110 125 9 24
50 50 115 130 10 26
52 52 120 135 11 28
54 54 125 140 12 30
56 56 130 145 13 32

International Bra Cup Size Conversions
USA UK Euro/Jap Fr/Belg/Spain Italy/Czech Australia
AA AA AA - - -
A A A A A A
B B B B B B
C C C C C C
D D D D D D
DD / E DD E E DD DD
F F - - F -
G G - - - -
H H - - - -
I I - - - -
J J - - - -

International Panties, Clothing and Swimwear Size Conversions
  USA UK Euro/Jap Fr/Belg/Spain Italy/Czech Australia
x-Small 4 8 34 36 40 8
Small 6 10 36 38 42 10
Medium 8 12 38 40 44 12
Large 10 14 40 42 46 14
x-Large 12 16 42 44 48 16
xx-Large 14 18 44 46 50 18
xxx-Large 16 20 46 48 52 20

Note: European sizing tend to run slightly smaller than American sizes. The following size chart is a guideline to approximate you size.


International Panties, Clothing and Swimwear Size Conversions
Size Bust Cup Size Waist Hips Dress Size
x-Small 30-32 A 21-23 32-34 2-4
Small 32-34 A-B 23-25 34-36 4-6
Medium 34-37 B-C 25-28 36-39 6-8
Large 37-40 C 28-31 39-41 8-10
x-Large 40-42 C-D 31-34 41-44 10-14
1xl 42-43 D 31-34 41-44 16-18
2xl 43-45 D-DD 34-37 44-47 20-22

International Dress Size Converter
US / Canada UK Australia Austria / Switz / Ger / Neth / Swe Bel / Spain / Fr / Portugal Italy Russia Japan
2 4 4 30 32 36 38 5
4 6 6 32 34 38 40 7
6 8 8 34 36 40 42 9
8 10 10 36 38 42 44 11
10 12 12 38 40 44 46 13
12 14 14 40 42 46 48 15
14 16 16 42 44 48 50 17
16 18 18 44 46 50 52 19
18 20 20 46 48 52 54 21
20 22 22 48 50 54 56 23

Free Shipping details: Valid through 11:59pm EST December 24, 2014. HOW TO REDEEM: Add qualifying items totaling $79 or more to your shopping bag. Shipping & handling, taxes, and gift cards do not qualify towards the minimum purchase. Enter offer code HOLIDAY at checkout. Shipping & handling charges will automatically be deducted for eligible orders after offer code is applied. EXCLUSIONS: Not valid on previous purchases. Cannot be combined with any other shipping offers or offers that provide discounts on your entire order. Limit 1 per customer. ADDITIONAL INFO: Valid for free standard shipping & handling anywhere in the United States and Canada. International (outside North America) customers will receive a $10.99 shipping credit. If international fees exceed $10.99, or the package exceeds a total weight of 250 grams, you will be sent an email link for payment for the balance of the shipping cost, which must be paid prior to shipping your order. Offer subject to full or partial adjustment due to returns, cancellations and exchanges.

If you have questions about our sale or need help shopping, contact us by emailing celine@nowthatslingerie.com.

Shopping Help

Contact Us

Vlogs & Videos

About NTL

Returns & Exchanges

Shipping & Handling

Privacy & Security

Popular Brands

Bra Doctor

Montelle Intimates

Calvin Klein

Dreamgirl

Papillon Blanc

Shop By Brand

Our Departments

Women's

Men's

Lingerie

Apparel

Accessories

Swimwear

Connect With Us