Bra Cup Size International Conversion Chart
The chart below covers US cup sizes from AAA to O, showing equivalents across UK, Europe, Australia, Japan, and China, based on bust-underbust measurement differences in inches and centimeters.
|
Bust-Underbust Difference
|
US
|
UK
|
Europe
|
Australia
|
Japan
|
China
|
|---|---|---|---|---|---|---|
|
<0.5 in (<1.27 cm)
|
AAA
|
—
|
—
|
—
|
—
|
—
|
|
0.5–1 in (1.27–2.54 cm)
|
AA
|
AA
|
AA
|
AA
|
AA
|
AA
|
|
1–2 in (2.54–5.08 cm)
|
A
|
A
|
A
|
A
|
A
|
A
|
|
2–3 in (5.08–7.62 cm)
|
B
|
B
|
B
|
B
|
B
|
B
|
|
3–4 in (7.62–10.16 cm)
|
C
|
C
|
C
|
C
|
C
|
C
|
|
4–5 in (10.16–12.7 cm)
|
D
|
D
|
D
|
D
|
D
|
D
|
|
5–6 in (12.7–15.24 cm)
|
DD/E
|
DD
|
E
|
DD
|
E
|
E
|
|
6–7 in (15.24–17.78 cm)
|
DDD or F
|
E
|
F
|
E
|
F
|
F
|
|
7–8 in (17.78–20.32 cm)
|
DDDD or G
|
F
|
G
|
F
|
G
|
G
|
|
8–9 in (20.32–22.86 cm)
|
H
|
FF
|
H
|
FF
|
H
|
H
|
|
9–10 in (22.86–25.4 cm)
|
I
|
G
|
I
|
G
|
I
|
I
|
|
10–11 in (25.4–27.94 cm)
|
J
|
GG
|
J
|
GG
|
J
|
J
|
|
11–12 in (27.94–30.48 cm)
|
K
|
H
|
K
|
H
|
K
|
K
|
|
12–13 in (30.48–33.02 cm)
|
L
|
HH
|
L
|
HH
|
L
|
L
|
|
13–14 in (33.02–35.56 cm)
|
M
|
J
|
M
|
J
|
M
|
M
|
|
14–15 in (35.56–38.1 cm)
|
N
|
JJ
|
N
|
JJ
|
N
|
N
|
|
15–16 in (38.1–40.64 cm)
|
O
|
K
|
O
|
K
|
O
|
O
|
Overview of Cup Size Systems
-
Cup Size Basis: Cup sizes are determined by the difference between the bust (fullest point) and underbust (snug) measurements. Generally, each 1-inch (2.54 cm) difference corresponds to one cup size (e.g., 1 inch = A, 2 inches = B).
-
Regional Variations:
-
US: Uses AAA, AA, A, B, C, D, DD, DDD/F, G, H, I, J, K, L, M, N, O, with some brands varying (e.g., DDD vs. F).
-
UK: Uses AA, A, B, C, D, DD, E, F, FF, G, GG, H, HH, J, JJ, K, with double letters after D.
-
Europe: Uses AA, A, B, C, D, E, F, G, H, I, J, K, L, M, N, with band sizes in centimeters.
-
Australia: Aligns closely with UK sizing (AA, A, B, C, D, DD, E, F, FF, etc.).
-
Japan: Uses AA, A, B, C, D, E, F, G, H, I, J, K, L, M, N, with band sizes in centimeters.
-
China: Similar to Japan, uses AA, A, B, C, D, E, F, etc., with local band size conventions.
-
Notes on the Chart
-
AAA Cup: The AAA cup (US) is for differences less than 0.5 inches, rare in most systems outside the US. Other regions typically start at AA or A.
-
Measurement Precision: Differences are approximate; brands may round up or down (e.g., a 5.5-inch difference might be DD or DDD depending on the brand).
-
US Variations: US sizing uses DD, DDD (sometimes F), and single letters beyond (G, H, I, etc.). Some brands label DDD as F or E.
-
UK Double Letters: UK sizing introduces double letters (DD, FF, GG, HH, JJ) after D, which shifts equivalencies (e.g., UK E = US DDD/F).
-
Europe and Japan: Use single letters and align closely, with band sizes in centimeters (e.g., 70, 75, 80). Japan extends to larger cups (N, O) in some brands.
-
Australia: Mirrors UK sizing but may vary slightly by brand.
-
China: Aligns with Japan/Europe for cup sizes, but band sizes may follow local conventions.
-
Fit Caveats: Cup size equivalencies assume consistent band sizes, but fit varies by bra style, brand, and body shape.
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