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.