How to Measure

The key to a great fit is to know your bra size

How to find your

Correct Bra size!

Measure your Full Bust


With arms relaxed down at your sides, measure the fullest part of your bust (no push up or sports bras). Keep the tape parallel to the floor.

Measure your Under Bust


Measure without a bra on under your bust against your ribcage.

Do a little Subtraction


Now that you have your two measurements you can find your bra size.

1. Your Band = your underbust measurement. i.e. 35.5”

2. Your Cup Size = the differnce when you subtract your
FULL BUST minus your UNDERBUST. i.e.

Full bust of 40 inches - Underbust of 35.5 inches = 4“
difference. Using the chart

Beside you can look up your cup size - 4 inch
difference is a D cup. 1” per cup size.

3. Your bra size is 35.5 D - most people with this band
size would wear a 36” band in other bra brands.


What is the math behind cup size?
Inches Bust - Under - Bust = 
A cup
B cup
C cup
4"D cup


DD cup
DDD/E cup

Under Bust should be the band size you are comfortable wearing. I measure as a 32, but feel much better in a 34. Use this under bust.

How to measure for

Bottoms and Dresses

If you are not sure what size bottom you should order or if you would like to check the fit of the dress on your waist and hips, there are two more measurements that will help you select your correct size.

Measure your Waist


Measure around your natural waistline, smallest area of your waist or do a side bend and the crease of the bend is your waist.

Measure your Full Hip


Stand with your feet together, measure around the fullest part of your butt/hips keeping the tape parallel to the floor.

Use the Shebird Master Size Chart


Now that you have your Bust, Underbust, Cup, Waist and Hip measurements you can check your measurements against the size chart below to see what SheBird size you should wear and how that compares against the US Standard clothing sizes.


Shebird Size US Standard Bust Under Bust Cup Waist Hip

0-2 32-33 30-32 A-B-C 25-26 35-36

4 34-35 30-34 A-B-C 27 37-38
S/M 6 36-37 32-36 A-B-C-D-DD 28 39

8 38-39
34-38 B-C-D-DD 29-30 40-41
M/L 10 40-40 36-40 B-C-D-DD 31 42

 12 42-43 38-42 B-C-D-DD
32-35 43-46
XL  14-16 44-46 40-43 B-C-D-DD
36-39 47-50
2XL 18-20 47-50 41-45 C-D-DD-E
40-43 51-55
3XL 22-24 51-54 43-47 C-D-DD-E
44-47 56-60

Still not sure? Please set up a Fit Expert call or email us


I know my size and I’m ready to shop.