Updated: 80% Of Women Wear The Wrong Bra Size, Here’s How to Get The Right Fit

It’s true. A full 80% of women aren’t wearing the right bra size. (We know, we couldn’t believe it either!) You would think given we’ve been walking around with these things since our teen years, we’d know what bra size to wear. Alas, many of us have been ill-fitted for years. Yikes! Thanks to Her Room, we now know exactly what to do to get the right fit. So here is a handy three step guide and infographic on getting the proper bra size –finally!

Updated: We’ve added the latest infograph from Her Room on how to find the best bra for your breast type as well. Now you have a thorough guide to getting the best fit in every way possible!

How to measure and fit a bra in three easy steps

Warning! After a 38 band size, the band size should be the closest higher even number to your actual measurement.  So 41.5″ is a 42 band. A 41″ measurement is a 42 band.

STEP 1: Measure for band size:

Keeping the measuring tape parallel with the ground, measure around your bra directly under your bust after expelling all air from your lungs – you want this measurement to be as small as possible. Round all fractional measurements to the nearest whole number.
Band Size Chart


After a 38 band size, the band size should be the closest higher even number to your actual measurement So, 41.5″ is a 42 band. A 41″ measurement is a 42 band.

STEP 2: Measure for cup size:

Standing straight, with your arms at your side, measure at the fullest part of your bust (while wearing a non-padded bra) making sure the measuring tape is parallel with the ground and not binding.Round all fractional measurements to the nearest whole number.

STEP 3: *Calculate your bra size:

Subtract your band measurement (step 1) from your cup measurement (step 2). Generally, for each inch in difference, the cup goes up by one size. See the cup size conversion chart below.


Step 1: 34″ under measurement = 36″ band size

Step 2: 39″ over measurement

Step 3: 39″ – 36″ = 3″ or C Cup Size

Your Size is probably a 36C

The cup size calculation starts falling apart at 4 inches larger than your band size, and if you have droopy or pendulous breasts, your measurement will not be accurate.

If The Difference Is: Your Standard Cup Size Is: Your *Universal Cup Size™ Is:
0″ to 1/2″ (1.3cm) AA
1/2″- 1″ (2.6 cm) A
2″ (5.1 cm) B
3″ (7.6 cm) C
3″ (7.6 cm) C
4″ (10.2 cm) D D1
5″ (12.7 cm) DD * or E * D2
6″ (15.2 cm) DDD * or F * D3
7″ (17.8 cm) G * D4
8″ (20.3 cm) H * D5
9″ (22.9 cm) I * D6
10″ (25.4 cm) J * D7
Universal Cup Sizing™ * Cup sizes larger than a D are called different letters by different brands (a DDD cup size in one brand can be called an E or F in other brands). So know your Universal Cup Size and you can find your correct size in any brand at HerRoom. Learn how to find your Universal Cup Size™

*Important Note: this measuring system tends to become less accurate as the cup sizes go above a D. Additionally, some manufacturers name larger cup sizes differently. “Th

Click to Enlarge

Bra Measuring - Infographic
How to Measure and Fit A Bra. Bras at Herroom.

Click to Enlarge
Her Room Infographic

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