Calvin Klein Bra Size Chart & Size Converter
Calvin Klein uses conventional band-and-cup sizes for many structured bras and alpha sizing for bralettes. This guide separates those systems, converts common bra sizes into CK bralette sizes, explains the brand’s published measuring method, and shows how current Calvin Klein styles differ in support and fit.
Calvin Klein sells structured bras in standard band-and-cup sizes and many bralettes in alpha sizes. On its bralette chart, 34C is M, 36C is L, 34D is L and 36DD is XL. If a bra is already sold as 34C or 36D, buy that size; use the alpha chart only for XS–XL bralettes.
- Calvin Klein publishes separate standard (XS–XL) and plus-size (1X–3X) bralette tables.
- Alpha sizes depend on band and cup, so a 34 band can be S, M or L.
- Sizes the chart does not list should not be rounded into the nearest alpha size.
- Structured styles such as Perfectly Fit use band-and-cup sizing, so keep your regular size.
- Product-page fit notes vary by style and override any blanket “runs small” rule.
Calvin Klein size converter: 3 tools in one
1. Bra size to Calvin Klein bralette size
2. Calvin Klein size to bra sizes
3. Measurements to Calvin Klein grid size
Calvin Klein bralette size chart
The standard CK bralette chart does not behave like a clothing chart where every 34 band maps to the same alpha size. Cup volume changes the recommendation. A 34A is listed under S, while 34B and 34C are listed under M and 34D is listed under L.
| Calvin Klein size | US bra sizes listed in the current bralette chart | What that means |
|---|---|---|
| XS | 32A, 30B | Small-band / lower-volume combinations |
| S | 34A, 32B, 30C | One step more cup volume or band circumference |
| M | 36A, 34B, 32C, 36B, 34C | Multiple sister-size-like combinations grouped together |
| L | 38B, 36C, 34D | Higher cup volume in the standard alpha range |
| XL | 40C, 38D, 36DD | Largest combinations shown in the standard bralette table |
Fast conversions people search most often
What Calvin Klein bralette size is 34C?
The standard Calvin Klein bralette chart places 34C in M. If the bra is sold as 34C rather than S/M/L, keep the band-and-cup size instead.
What Calvin Klein bralette size is 36C?
The standard CK chart places 36C in L. This illustrates why band size alone is not enough to choose a bralette size.
What Calvin Klein bralette size is 34D?
The current standard bralette table places 34D in L.
What Calvin Klein bralette size is 36DD?
The current table places 36DD in XL. For more structured support, a band-and-cup style can give a more precise fit.
Calvin Klein band-and-cup size chart
For conventional Calvin Klein bras, the brand publishes a bust-and-underbust grid rather than converting everything to alpha sizes. The current US guide shows common sizes from 32A through 38DDD within its core measurement table.
| Full bust | Underbust 27″ | Underbust 28–29″ | Underbust 30–31″ | Underbust 32–34″ |
|---|---|---|---|---|
| 33″ | 32A | — | — | — |
| 34″ | 32B | 34A | — | — |
| 35″ | 32C | 34B | 36A | — |
| 36″ | 32D | 34C | 36B | 38A |
| 37″ | 32DD | 34D | 36C | 38B |
| 38″ | 32DDD | 34DD | 36D | 38C |
| 39″ | — | 34DDD | 36DD | 38D |
| 40″ | — | — | 36DDD | 38DD |
| 41″ | — | — | — | 38DDD |
Calvin Klein plus-size bralette chart
Calvin Klein also publishes a separate plus-size bra conversion table. That matters because forcing 40–48 bands into the XS–XL standard chart would create false conversions.
| Cup | 38 | 40 | 42 | 44 | 46 | 48 |
|---|---|---|---|---|---|---|
| B | — | — | 1X | 2X | 2X | 3X |
| C | — | 1X | 1X | 2X | 2X | 3X |
| D | — | 1X | 2X | 2X | 3X | 3X |
| DD | 1X | 1X | 2X | 3X | 3X | — |
How Calvin Klein says to measure for a bra
Calvin Klein’s current US guide uses a traditional two-step measuring method. First, it tells shoppers to measure snugly around the ribcage directly under the breasts. The published instructions then add 5 inches to an odd underbust measurement or 4 inches to an even underbust measurement to establish band size. Second, it instructs shoppers to measure the fullest part of the bust loosely with the tape parallel to the floor, then use the difference from the band to determine cup size.
If you do not know your current bra size, use our bra size calculator or follow the full how to measure bra size guide. Once you have a starting size, come back to this page to choose between CK bralette alpha sizing and a conventional band-and-cup style.
Calvin Klein bralette vs structured bra sizing
Choose a bralette if…
You want stretch, light support and simplified alpha sizing. Icon Cotton and Invisibles bralettes are good examples of this comfort-led approach.
Choose band & cup if…
You want more exact volume, shaping, separation and band tension. Perfectly Fit bras are a better example of precision sizing.
Does Calvin Klein run small?
There is no reliable one-rule answer across every Calvin Klein bra. Calvin Klein describes some Icon Cotton bralettes as true to size, while other product pages advise sizing up for more coverage and a more relaxed fit. Product-specific fit notes matter more than a generic “Calvin Klein runs small” claim.
How to check the fit once the bra arrives
Good fit signs
- The band sits level around your ribcage instead of riding upward.
- Breast tissue stays inside the cups without obvious cutting in.
- There is no major empty space or collapsing at the top of a molded cup.
- Straps stay in place without carrying the entire weight of the bust.
- You can breathe, reach and sit comfortably.
Try another size or shape if…
- The back band climbs upward after a few minutes of wear.
- The cup edge creates visible spill at the top or sides.
- The cup gaps even after the straps are adjusted.
- The center or wire sits painfully on breast tissue.
- You want more lift than an alpha-size bralette is designed to provide.
Shop Calvin Klein bras on Amazon
Amazon inventory changes frequently, so these buttons use exact product-family searches. Check your size from the converter above before you order.
Calvin Klein Icon Cotton Bralettes
Search current Calvin Klein cotton-logo-band bralette listings.
Check Amazon
Calvin Klein Invisibles Bralettes
Search current Calvin Klein Invisibles seamless bralette options.
Check Amazon
Calvin Klein Perfectly Fit Bras
Search structured Calvin Klein Perfectly Fit bras in band-and-cup sizes.
Check AmazonAffiliate disclosure: Amazon links on this page are affiliate links. As an Amazon Associate, Bra-Calculator.com may earn from qualifying purchases. This does not change your purchase price.
Calvin Klein sister sizes
Sister sizes keep roughly similar cup volume while changing the band. For example, 34C has the familiar sister sizes 32D and 36B. This can be useful in a structured Calvin Klein bra when the cup volume feels correct but the band is too tight or too loose.
| Your size | Tighter-band sister | Looser-band sister | CK bralette note |
|---|---|---|---|
| 32C | 30D | 34B | 32C and 34B both appear under M |
| 34C | 32D | 36B | 34C and 36B appear under M; 32D is not explicitly listed |
| 34D | 32DD | 36C | 34D and 36C appear under L |
| 38D | 36DD | 40C | 38D, 36DD and 40C are listed under XL |
For more combinations, use our sister size calculator. Sister sizing changes strap position, cup spacing and wire width, so it is an adjustment—not an identical bra.
Common Calvin Klein sizing mistakes
1. Using clothing size as bra size
Your Calvin Klein T-shirt size does not tell you enough about ribcage circumference and breast volume.
2. Assuming every M is equivalent
The official bralette chart groups specific bra sizes under M. A size that is not listed should not automatically be squeezed into M.
3. Converting structured bras back to alpha sizes
If a bra is already sold in 34C or 36D, that information is more precise than S/M/L.
4. Ignoring product fit notes
Calvin Klein gives different fit guidance across products. Read the exact product note after using the general chart.
Worked examples: Calvin Klein sizing in practice
| If you wear | Bralette (S–XL) | Structured bra | What to do |
|---|---|---|---|
| 34C | M | 34C | Listed in the standard chart; buy M in bralettes, 34C in structured styles. |
| 36C | L | 36C | Same band as 34C but a different alpha size, because the band changes the result. |
| 32D | Not listed | 32D | Skip alpha sizing. Use a band-and-cup style, or check the sister 34C (listed as M) on the exact product page. |
| 40D | Plus table: 1X | Check product range | The plus-size table lists 40D under 1X. The grid above stops at 38DDD. |
The 3-check method before you order
- Identify the sizing system. If the product page shows 34C or 36D, it is band-and-cup. If it shows XS–XL or 1X–3X, it is alpha.
- Match only listed combinations. Use the converter above. If your size is not on a chart, do not round to the closest letter.
- Read the product’s own fit note. Calvin Klein describes some styles as true to size and advises sizing up on others, so the page for your exact bra decides the final choice.
Calvin Klein fit problems and fixes
| Problem | Likely cause | Try this |
|---|---|---|
| Band rides up the back | Band too loose, or alpha size too large for your ribcage | Go down one band and up one cup (sister size), or move to a band-and-cup style. |
| Cup spills at the top or sides | Cup volume too small for the style | Go up one cup, or the next alpha size where your combination is listed. |
| Cup gaps or wrinkles | Cup too large or wrong shape for your breast shape | Go down one cup or try a lightly lined molded style such as Perfectly Fit. |
| Straps dig in | Band not doing enough of the support | Tighten the band fit first, then re-adjust the straps. |
| Not enough lift in a bralette | Alpha-size bralettes are designed for light support | Compare a lift-padded style such as Invisibles Lift or a structured bra. |
Calvin Klein US size vs UK, EU, French and Australian bra sizes
Calvin Klein’s published guide is US-based. If you shop with a UK, EU, French or Australian size, convert the band first, then match the cup on this page. Cup letters past D differ by region, so confirm the exact product page.
| US / UK band | EU band | French band | Australian band |
|---|---|---|---|
| 30 | 65 | 80 | 8 |
| 32 | 70 | 85 | 10 |
| 34 | 75 | 90 | 12 |
| 36 | 80 | 95 | 14 |
| 38 | 85 | 100 | 16 |
| 40 | 90 | 105 | 18 |
For other brands, compare our SKIMS bra size chart, Aerie bra size chart and Target (Auden) bra size chart, or browse every brand in our bra size charts by brand hub.
How this guide was checked
Chart data was reproduced from Calvin Klein’s current US size guide and checked against the converter logic on this page, so the tables and tools return the same combinations. Where Calvin Klein does not publish a combination, this guide says so instead of estimating.
Calvin Klein bra size FAQs
What Calvin Klein bralette size is 34C?
The current standard Calvin Klein bralette chart lists 34C under M. If the product is sold in band-and-cup sizing instead of S/M/L, begin with 34C.
What Calvin Klein bralette size is 36C?
The official standard bralette table lists 36C under L.
What Calvin Klein bralette size is 34D?
The current CK bralette chart lists 34D under L.
What Calvin Klein bralette size is 36DD?
The standard bralette table places 36DD under XL.
What bra sizes are a Calvin Klein medium?
In the current standard chart, Calvin Klein M covers 36A, 34B, 32C, 36B and 34C. Sizes outside that list, such as 32D, are not explicitly assigned to M, so check the product page or choose a band-and-cup style.
What bra sizes are a Calvin Klein large?
Calvin Klein L covers 38B, 36C and 34D in the current standard bralette chart. Combinations not listed there should not be guessed into L.
What bra sizes are a Calvin Klein small?
Calvin Klein S covers 34A, 32B and 30C in the current standard bralette chart.
What bra sizes are a Calvin Klein XL?
The standard Calvin Klein XL covers 40C, 38D and 36DD. Larger band sizes are handled by the separate plus-size 1X–3X table.
Does Calvin Klein run small?
Not consistently across every bra. Current product guidance varies by style, so product-specific notes are more useful than a blanket rule.
Does Calvin Klein use band and cup sizes?
Yes. Structured Calvin Klein bras such as Perfectly Fit styles use conventional band-and-cup sizing, while many bralettes use alpha sizing.
What is the largest Calvin Klein bralette size?
The brand publishes separate standard and plus-size conversion tables. Its plus-size table includes 1X, 2X and 3X for selected combinations up to a 48 band.
How does Calvin Klein tell you to measure band size?
The current US guide says to measure snugly under the breasts and add 5 inches to an odd measurement or 4 inches to an even measurement. That is Calvin Klein’s published method, not a universal bra-fitting rule.
What if my bra size is not on the Calvin Klein bralette chart?
Do not round it into the nearest alpha size. Check the exact product’s size guide, look at a listed sister size, or choose a structured Calvin Klein bra sold in your band-and-cup size.
Can I use sister sizes with Calvin Klein?
Yes, as an adjustment. A sister size keeps similar cup volume on a different band, for example 34C and 32D. It changes strap position and wire width, so it is not an identical bra.
Reviewed by Amelia
Amelia reviews Bra-Calculator.com brand size guides for measurement logic, practical fit usefulness and clarity. Brand charts are treated as brand-specific references, while real-world fit is judged by band stability, cup containment, support and comfort.
Last reviewed: 2026. Product availability, prices and size ranges can change. Confirm the current size guide on the exact product page before ordering.
