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1. How to Measure Your Cup Size

Japanese method recommended

We recommend measuring with the Japanese method — it's how our bras are designed, and it gives you the most accurate starting size. Japanese sizing uses your underbust measurement for the band and the difference between your bust and underbust to find the cup.

Once you have your measurements, use our size chart or calculator below to find your closest match.

What you'll need

  • A soft measuring tape
  • A mirror, if you have one
  • A comfortable, lightly lined bra

*Avoid measuring over a compression sports bra or a heavily padded push-up bra — both can shift the result.

Step 1: Band measurement

Wrap the tape snugly around your ribcage, directly under your bust — this is where your bra band sits.

Keep it level all the way around. It should feel secure against your body, not tight enough to press in.

Write down this measurement in centimeters or inches.

Step 2: Bust measurement

Measure around the fullest part of your bust.

Keep the tape level and comfortably fitted — not pulling, not loose. It should rest against your body without changing your shape.

Write down this measurement in centimeters or inches.

Step 3: Cup size

Subtract your band measurement from your bust measurement. That difference is your cup size.

Example:
Bust: 85 cm
Band: 70 cm
Difference: 15 cm
Starting size: C70
Use the cup size chart below to find your starting size.

How to measure your size
— we recommend measuring in a lightly lined bra for the most accurate fit.
How to measure your size
— we recommend measuring in a lightly lined bra for the most accurate fit.

2. Bra Size Calculator

Not sure about your size?

Enter your bust and band measurements below and we'll calculate your starting size in seconds.

Bra size calculator

Select your underbust and bust measurements, and we’ll calculate your starting size.

3. CUP SIZE CHART

Wired Bras (A–H Cups). Follow the two steps below to find your size.

Step 1 — Find Your Band Size

Band
(Underbust)
63–67 cm
24.8–26.4 in
68–72 cm
26.8–28.3 in
73–77 cm
28.7–30.3 in
78–82 cm
30.7–32.3 in
83–87 cm
32.7–34.3 in
88–92 cm
34.6–36.2 in
Band Size 65 70 75 80 85 90
Band Size 65
Underbust 63–67 cm
24.8–26.4 in
Band Size 70
Underbust 68–72 cm
26.8–28.3 in
Band Size 75
Underbust 73–77 cm
28.7–30.3 in
Band Size 80
Underbust 78–82 cm
30.7–32.3 in
Band Size 85
Underbust 83–87 cm
32.7–34.3 in
Band Size 90
Underbust 88–92 cm
34.6–36.2 in

Step 2 — Find Your Cup Size

Find your cup size by subtracting your band measurement from your bust measurement.

Difference
(Bust − Band)
Cup
10–12.5 cm
3.9–4.9 in
A
12.5–15 cm
4.9–5.9 in
B
15–17.5 cm
5.9–6.9 in
C
17.5–20 cm
6.9–7.9 in
D
20–22.5 cm
7.9–8.9 in
E
22.5–25 cm
8.9–9.8 in
F
25–27.5 cm
9.8–10.8 in
G
27.5–30 cm
10.8–11.8 in
H

Cup progression follows Japanese sizing standards (D, E, F, G, H).

Wireless & Sleep Bra (A–E Cups Range)

JP Size S
(Small)
M
(Medium)
L
(Large)
XL
(Extra Large)
US Size XS S M L
Bust 72–80 cm
28.3–31.4 in
79–87 cm
31.1–34.2 in
86–94 cm
33.8–37.0 in
93–101 cm
36.6–39.7 in
Band
(Underbust)
62–68 cm
24.4–26.8 in
67–73 cm
26.4–28.7 in
72–78 cm
28.3–30.7 in
77–83 cm
30.3–32.7 in
JP Size S (Small)
US Size XS
Bust 72–80 cm
28.3–31.4 in
Band 62–68 cm
24.4–26.8 in
JP Size M (Medium)
US Size S
Bust 79–87 cm
31.1–34.2 in
Band 67–73 cm
26.4–28.7 in
JP Size L (Large)
US Size M
Bust 86–94 cm
33.8–37.0 in
Band 72–78 cm
28.3–30.7 in
JP Size XL (Extra Large)
US Size L
Bust 93–101 cm
36.6–39.7 in
Band 77–83 cm
30.3–32.7 in

Wireless & Sleep Bra (F–H Cups Range)

JP Size S
(Small)
M
(Medium)
L
(Large)
XL
(Extra Large)
US Size XS S M L
Bust 82–90 cm
32.2–35.4 in
89–97 cm
35.0–38.1 in
96–104 cm
37.7–40.9 in
103–111 cm
40.5–43.7 in
Band
(Underbust)
62–68 cm
24.4–26.8 in
67–73 cm
26.4–28.7 in
72–78 cm
28.3–30.7 in
77–83 cm
30.3–32.7 in
JP Size S (Small)
US Size XS
Bust 82–90 cm
32.2–35.4 in
Band 62–68 cm
24.4–26.8 in
JP Size M (Medium)
US Size S
Bust 89–97 cm
35.0–38.1 in
Band 67–73 cm
26.4–28.7 in
JP Size L (Large)
US Size M
Bust 96–104 cm
37.7–40.9 in
Band 72–78 cm
28.3–30.7 in
JP Size XL (Extra Large)
US Size L
Bust 103–111 cm
40.5–43.7 in
Band 77–83 cm
30.3–32.7 in

※ G = Japanese Glamour Size (F–H+ cups); product tag may show a different label.

4. INTERNATIONAL CONVERSION

Japanese sizes with their US, UK, and AUS equivalents.

Band 65 cm

Japan US UK AUS
A65 30A 30A 8A
B65 30B 30B 8B
C65 30C 30C 8C
D65 30D 30D 8D
E65 30DD (E) 30DD 8DD
F65 30DDD (F) 30E 8E
G65 30G 30F 8F
H65 30H 30FF 8FF

Band 70 cm

Japan US UK AUS
A70 32A 32A 10A
B70 32B 32B 10B
C70 32C 32C 10C
D70 32D 32D 10D
E70 32E (32DD) 32DD 10DD
F70 32F (32DDD) 32E 10E
G70 32G 32F 10F
H70 32H 32FF 10FF

Band 75 cm

Japan US UK AUS
A75 34A 34A 12A
B75 34B 34B 12B
C75 34C 34C 12C
D75 34D 34D 12D
E75 34E (34DD) 34DD 12DD
F75 34F (34DDD) 34E 12E
G75 34G 34F 12F
H75 34H 34FF 12FF

Band 80 cm

Japan US UK AUS
A80 36A 36A 14A
B80 36B 36B 14B
C80 36C 36C 14C
D80 36D 36D 14D
E80 36E (36DD) 36DD 14DD
F80 36F (36DDD) 36E 14E
G80 36G 36F 14F
H80 36H 36FF 14FF

Band 85 cm

Japan US UK AUS
A85 38A 38A 16A
B85 38B 38B 16B
C85 38C 38C 16C
D85 38D 38D 16D
E85 38E (38DD) 38DD 16DD
F85 38F (38DDD) 38E 16E
G85 38G 38F 16F
H85 38H 38FF 16FF
5. PANTY SIZE GUIDE

Women’s Panty

JP Size M
(Medium)
L
(Large)
XL
(Extra Large)
US Size S M L
Hip 87–95 cm
34–37 in
92–100 cm
36–39 in
97–105 cm
38–41 in
JP Size M (Medium)
US Size S
Hip 87–95 cm
34–37 in
JP Size L (Large)
US Size M
Hip 92–100 cm
36–39 in
JP Size XL (Extra Large)
US Size L
Hip 97–105 cm
38–41 in

Men’s Panty

JP Size S
(Small)
M
(Medium)
L
(Large)
XL
(Extra Large)
US Size XS S M L
Waist 68–76 cm
27–30 in
76–84 cm
30–33 in
84–94 cm
33–37 in
94–104 cm
37–41 in
JP Size S (Small)
US Size XS
Waist 68–76 cm
27–30 in
JP Size M (Medium)
US Size S
Waist 76–84 cm
30–33 in
JP Size L (Large)
US Size M
Waist 84–94 cm
33–37 in
JP Size XL (Extra Large)
US Size L
Waist 94–104 cm
37–41 in
6. LOUNGEWEAR SIZE GUIDE
JP Size S
(Small)
M
(Medium)
L
(Large)
XL
(Extra Large)
US Size XS S M L
Bust 72–80 cm
28.3–31.5 in
79–87 cm
31.1–34.3 in
86–94 cm
33.9–37.0 in
93–101 cm
36.6–39.8 in
Waist 58–64 cm
22.8–25.2 in
64–70 cm
25.2–27.6 in
69–77 cm
27.2–30.3 in
77–85 cm
30.3–33.5 in
Hip 82–90 cm
32.3–35.4 in
87–95 cm
34.3–37.4 in
92–100 cm
36.2–39.4 in
97–105 cm
38.2–41.3 in
JP Size S (Small)
US Size XS
Bust 72–80 cm
28.3–31.5 in
Waist 58–64 cm
22.8–25.2 in
Hip 82–90 cm
32.3–35.4 in
JP Size M (Medium)
US Size S
Bust 79–87 cm
31.1–34.3 in
Waist 64–70 cm
25.2–27.6 in
Hip 87–95 cm
34.3–37.4 in
JP Size L (Large)
US Size M
Bust 86–94 cm
33.9–37.0 in
Waist 69–77 cm
27.2–30.3 in
Hip 92–100 cm
36.2–39.4 in
JP Size XL (Extra Large)
US Size L
Bust 93–101 cm
36.6–39.8 in
Waist 77–85 cm
30.3–33.5 in
Hip 97–105 cm
38.2–41.3 in

Need help choosing your size?

Bra sizing is personal, and Japanese sizing can feel a little different at first.

Send us your bust and band measurements, your usual bra size, and the aimerfeel style you’re looking at. If you already have a size in mind, include that too — we’ll help you find a good starting point before you order.

Sister size

A sister size shares the same cup volume with a different band. If C70 feels tight in the band, try B75 — same cup volume, wider band. If it feels too loose, try D65.

Sister sizing helps when the cup feels close but the band doesn't. It won't fix the fit if the issue is cup shape, padding, or lift level — in that case, go up or down a cup instead.

7.FAQ