Bra Size Chart: Cup & Band
Band 34 ≈ EU 75 · 36 ≈ EU 80. Look up cup and band across US, UK, EU—then use sister sizes when you need a nearby fit.
Bra size calculator →Quick answers: band 32–38 & common sizes
Common bands are 32, 34, 36, and 38. A size like 34B pairs the band with a cup letter. Numbers match the conversion chart; brand cuts still vary.
- US/UK 32 band≈ EU 70 · JP 70Common smaller band
- US/UK 34 band≈ EU 75 · JP 75Very common US band
- US/UK 36 band≈ EU 80 · JP 80Often ≈ EU 80
- US/UK 38 band≈ EU 85 · JP 85Larger everyday band
Common sizes (US → UK / EU)
- 32BUK 32B · EU 70BSisters: 30C, 34A
- 34BUK 34B · EU 75BSisters: 32C, 36A
- 36CUK 36C · EU 80CSisters: 34D, 38B
- 38DUK 38D · EU 85DSisters: 36DD, 40C
Bra size calculator →How to measure →Full bra chart →US ↔ UK cups →
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Bra Sister Size Chart
Sister sizes keep roughly the same cup volume while changing the band. Go down a band and up a cup (or up a band and down a cup). Brands still vary—use this as a starting point.
| Your size (US) | Common sister sizes |
|---|---|
| 32A | 30B · 34AA |
| 32B | 30C · 34A |
| 34B | 32C · 36A |
| 34C | 32D · 36B |
| 34DD | 32E · 36D |
| 36C | 34D · 38B |
| 38D | 36DD · 40C |
Example: 34C ≈ 32D ≈ 36B. If the band rides up, try a tighter sister; if cups gap, try a smaller cup sister on a nearby band.
Calculate your starting size with the bra size calculator, or learn how to measure for bra size.
What this bra size chart covers
Convert US, UK, European, and Japanese band and cup labels. Use it with your measurements—or the calculator—as a starting point. Brand cuts still vary.
For step-by-step measuring, see how to measure with a tape. For plus apparel sizing after you know your bra size, see the plus size clothing chart.
How to Use This Chart
Step 1: Take Measurements
- • Measure your underbust snugly
- • Measure your bust while standing straight
- • Measure your bust while leaning forward 90°
- • Use our calculator for weighted average
Step 2: Find Your Size
- • Look up your measurements in the chart
- • Find the corresponding size in your preferred standard
- • Consider sister sizes for better fit
- • Try on different styles and brands
Frequently Asked Questions
What is a bra cup size?
Cup size is the letter (A, B, C, D, DD…) based on how much larger your bust is than your underbust. The same letter on a different band is not the same volume—use sister sizes when you change the band.
What is bra band size?
Band size is the number (32, 34, 36, 38…) from your underbust measurement. A snug, level band should provide most of the support.
What is a bra size conversion chart?
A bra size conversion chart maps the same fit across US, UK, and EU labels—for example US/UK 36 band ≈ EU 80. Cup letters after D can diverge by region; confirm on the brand chart.
What is a bra sister size chart?
A sister size chart lists band/cup pairs with similar cup volume—for example 34C, 32D, and 36B. Use it when the cup fits but the band does not (or the reverse).
What does 34B bra size mean?
34B usually means a US band around 34 with a B cup. Common sister sizes include 32C and 36A. Confirm with measurements and the brand chart.
What is 32B bra size?
32B is a US/UK size with a 32 band and B cup. Sister sizes often include 30C and 34A. Measure underbust and bust to confirm.
What is 36B bra size in cm?
A US/UK 36 band often pairs with about an 80 cm EU underbust label. Bust cm for a B cup depends on your measurements—use the calculator rather than guessing from the letter alone.
What is 36DD bra size equivalent?
36DD is a 36 band with a DD cup on many US charts. Sister sizes with similar volume often include 34DDD and 38D (brand ladders vary). UK labeling after D can differ—compare charts.
What is 75B bra size in US?
EU-style 75B often maps roughly to a US 34B starting point. Exact conversions vary by brand—check the calculator and try sister sizes if needed.
What is 80B bra size in US?
EU-style 80B often maps near a US/UK 36B starting point. Confirm with measurements; brand stretch still changes fit.
What is the smallest or biggest bra size?
Retail ranges vary. Many charts start near AA cups and bands in the high 20s/30s, and go well past DD on larger bands. “Smallest” and “biggest” are brand limits—not a single universal size.
Why do I need to measure both standing and leaning?
Measuring both positions helps account for different breast shapes and provides a more accurate cup size calculation. Our calculator uses a weighted average (70% standing + 30% leaning).