For women with softer breast tissue that doesn’t tend to stay in place, we recommend that you measure yourself with a sleep bra on. This will help you to achieve the most accurate measurement. If you have firmer breast tissue that doesn’t squish or wiggle very much, try measuring without a bra.
If you are not sure which method will provide the most accurate results for you, measure both ways!
STEP 2. MEASURE YOUR RIBCAGE
Your ribcage measurement is going to determine your band size.
Using soft measuring tape, measure right underneath your breasts, where your bra will comfortably sit. Keep the tape parallel to the ground pull firmly.
For maximum band support, exhale deeply to get the smallest band size possible. Remember, 80% of your bra’s support should come from the band, and only 20% from the straps.
Round your measurement to the nearest inch. If your measurement is at or below the ½ inch mark, round down to preserve the elasticity of your bra and make it last longer. NEVER ADD INCHES.
STEP 3. MEASURE YOUR BUST LINE
Measure across your nipples at the widest part of your breasts. Make sure the measuring tape is parallel to the ground. Never measure under your armpits or over the tops of your breasts.
Pull until the measuring tape is snug, but not tight. You will need enough room in the cup so that your breast tissue does not overflow. If you land between two numbers, round up.
STEP 4. CALCULATE YOUR SIZE
Subtract your band measurement (Step 2) from your bust measurement (Step 3). Then use the chart below to determine your cup size.
Difference in Sizes |
US Cup Size |
UK Cup Size |
EU Cup Size |
1" |
A |
A |
A |
2" |
B |
B |
B |
3" |
C |
C |
C |
4" |
D |
D |
D |
5" |
DD or E |
DD |
E |
6" |
DDD or F |
E |
F |
7" |
G |
F |
G |
8" |
H |
FF |
H |
9" |
I |
G |
I |
10" |
J |
GG |
J |
11" |
K |
H |
K |
12" |
L |
HH |
L |
13" |
M |
J |
M |
14" |
N |
JJ |
N |
15" |
O |
K |
O |
16" |
P |
K |
P |