What you thought about bra sizes is wrong! - How to choose the correct bra cup size when changing bra band

Click HERE for to scroll down to our popular conversion table.

Bra cup sizes and their actual volume
Picture: Bra cup and their actual, corresponding size (volume)

WERE YOU ALSO MISTAKEN? The size of bra cups depends on the bra band size. Without the bra band size, a cup size means nothing. Most women don't know about this. It's time to learn this once and for all! =)

Popular bras today. Scroll down to continue reading this article.

(We highly recommend reading our amazing article The perfect bra size? - Start with the bra band, not the bra cups!)

There are multiple bra sizing standards. We will mostly discuss US and EU (also know as International).

 

Take this as an example: The D-cup in US 30D (EU 75D) and US 36D (EU 90D) does not have the same size (volume). A bra in US 36D (EU 90D) can fit a larger bust than a bra in US 30D (EU 75D).

The size designation of a bra cup (B, C, D etc) does not state the volume of the cups. This part about bra sizes is a bit counter-intuitive and misunderstood. This results in many women choosing the wrong bra size. Read on and we'll explain.

A cup in US 30G (EU 65G) has about the same size (volume) as in US 38C (EU 85C). How can this be?

A bra cup size refers to the difference between the measure under the bust (the bra band) and the measure over the bust where the bust is the biggest. A cup size does NOT say how big of a bust that will fit in the bra cup. The cup size refers only to the difference between a band size and a cup size. The cup size is a comparison to the bra band size. It's relative.

Is the bra band size also a comparison? No! The bra band size (US 34, 36, 38 or EU 75, 80, 85 etc) is easier in the sense that it's based on your under bust measurement alone, and is not a comparison to something else.

Okay, so how does this help me? Adjust the bra cup size when changing the band size!

Change the cup size when changing the band size

The most common mistake women make is buying bras with too large bra bands. The support and lift should come mainly from the bra band. The weight of the bust should be carried by the band, not by the shoulder straps. If the bra band is too big, it will not provide proper support. (More about this in our article on how to choose bra band.)

If the cups fit your bust but the bra band size has to be changed, you will also need to change the cup size. For example, if you change from US 36D (EU 80D) to US 34D (EU 75D) then the cup will feel smaller (since a D-cup in 75D is smaller than a D-cup in 80D). Too small cups can be mistaken for the bra band being too small. This is import and worth repeating: You can incorrectly believe that the bra band is too small even though it's the cups that are too small.

"Sister sizes" - A rule of thumb

When you go down a size in bra band then go up a cup size, e.g. from US 36D (EU 80D) to US 34DD (EU 75E). When you go up a size in bra band, go down a cup size, e.g. from US 36D (EU 80D) to US 38C (EU 85C). This rule of thumb is generally referred to as "Sister sizes". Use our table below to ensure that you are making this conversion correctly.

Conversion tables for choosing the correct bra cup size when changing bra band

Click a bra size standard to scroll down to the corresponding table:

US bra size conversion table for bra band size changes

US-sizes
If the bra band
is too big,
choose size:
Your current
US bra size:
If the bra band
is too small,
choose size:
26B28A30AA
26C28B30A
26D28C30B
26DD/E28D30C
26DDD/F28DD/E30D
26DDDD/G28DDD/F30DD/E
26H28DDDD/G30DDD/F
26I28H30DDDD/G
26J28I30H
26K28J30I
26L28K30J
26M28L30K
26N28M30L
26O28N30M
26P28O30N
26R28P30O
26S28R30P
26T28S30R
If the bra band
is too big,
choose size:
Your current
US bra size:
If the bra band
is too small,
choose size:
28B30A32AA
28C30B32A
28D30C32B
28DD/E30D32C
28DDD/F30DD/E32D
28DDDD/G30DDD/F32DD/E
28H30DDDD/G32DDD/F
28I30H32DDDD/G
28J30I32H
28K30J32I
28L30K32J
28M30L32K
28N30M32L
28O30N32M
28P30O32N
28R30P32O
28S30R32P
28T30S32R
If the bra band
is too big,
choose size:
Your current
US bra size:
If the bra band
is too small,
choose size:
30B32A34AA
30C32B34A
30D32C34B
30DD/E32D34C
30DDD/F32DD/E34D
30DDDD/G32DDD/F34DD/E
30H32DDDD/G34DDD/F
30I32H34DDDD/G
30J32I34H
30K32J34I
30L32K34J
30M32L34K
30N32M34L
30O32N34M
30P32O34N
30R32P34O
30S32R34P
30T32S34R
If the bra band
is too big,
choose size:
Your current
US bra size:
If the bra band
is too small,
choose size:
32B34A36AA
32C34B36A
32D34C36B
32DD/E34D36C
32DDD/F34DD/E36D
32DDDD/G34DDD/F36DD/E
32H34DDDD/G36DDD/F
32I34H36DDDD/G
32J34I36H
32K34J36I
32L34K36J
32M34L36K
32N34M36L
32O34N36M
32P34O36N
32R34P36O
32S34R36P
32T34S36R
If the bra band
is too big,
choose size:
Your current
US bra size:
If the bra band
is too small,
choose size:
34B36A38AA
34C36B38A
34D36C38B
34DD/E36D38C
34DDD/F36DD/E38D
34DDDD/G36DDD/F38DD/E
34H36DDDD/G38DDD/F
34I36H38DDDD/G
34J36I38H
34K36J38I
34L36K38J
34M36L38K
34N36M38L
34O36N38M
34P36O38N
34R36P38O
34S36R38P
34T36S38R
If the bra band
is too big,
choose size:
Your current
US bra size:
If the bra band
is too small,
choose size:
36B38A40AA
36C38B40A
36D38C40B
36DD/E38D40C
36DDD/F38DD/E40D
36DDDD/G38DDD/F40DD/E
36H38DDDD/G40DDD/F
36I38H40DDDD/G
36J38I40H
36K38J40I
36L38K40J
36M38L40K
36N38M40L
36O38N40M
36P38O40N
36R38P40O
36S38R40P
36T38S40R
If the bra band
is too big,
choose size:
Your current
US bra size:
If the bra band
is too small,
choose size:
38B40A42AA
38C40B42A
38D40C42B
38DD/E40D42C
38DDD/F40DD/E42D
38DDDD/G40DDD/F42DD/E
38H40DDDD/G42DDD/F
38I40H42DDDD/G
38J40I42H
38K40J42I
38L40K42J
38M40L42K
38N40M42L
38O40N42M
38P40O42N
38R40P42O
38S40R42P
38T40S42R
If the bra band
is too big,
choose size:
Your current
US bra size:
If the bra band
is too small,
choose size:
40B42A44AA
40C42B44A
40D42C44B
40DD/E42D44C
40DDD/F42DD/E44D
40DDDD/G42DDD/F44DD/E
40H42DDDD/G44DDD/F
40I42H44DDDD/G
40J42I44H
40K42J44I
40L42K44J
40M42L44K
40N42M44L
40O42N44M
40P42O44N
40R42P44O
40S42R44P
40T42S44R
If the bra band
is too big,
choose size:
Your current
US bra size:
If the bra band
is too small,
choose size:
42B44A46AA
42C44B46A
42D44C46B
42DD/E44D46C
42DDD/F44DD/E46D
42DDDD/G44DDD/F46DD/E
42H44DDDD/G46DDD/F
42I44H46DDDD/G
42J44I46H
42K44J46I
42L44K46J
42M44L46K
42N44M46L
42O44N46M
42P44O46N
42R44P46O
42S44R46P
42T44S46R
If the bra band
is too big,
choose size:
Your current
US bra size:
If the bra band
is too small,
choose size:
44B46A48AA
44C46B48A
44D46C48B
44DD/E46D48C
44DDD/F46DD/E48D
44DDDD/G46DDD/F48DD/E
44H46DDDD/G48DDD/F
44I46H48DDDD/G
44J46I48H
44K46J48I
44L46K48J
44M46L48K
44N46M48L
44O46N48M
44P46O48N
44R46P48O
44S46R48P
44T46S48R
If the bra band
is too big,
choose size:
Your current
US bra size:
If the bra band
is too small,
choose size:
46B48A50AA
46C48B50A
46D48C50B
46DD/E48D50C
46DDD/F48DD/E50D
46DDDD/G48DDD/F50DD/E
46H48DDDD/G50DDD/F
46I48H50DDDD/G
46J48I50H
46K48J50I
46L48K50J
46M48L50K
46N48M50L
46O48N50M
46P48O50N
46R48P50O
46S48R50P
46T48S50R
If the bra band
is too big,
choose size:
Your current
US bra size:
If the bra band
is too small,
choose size:
48B50A52AA
48C50B52A
48D50C52B
48DD/E50D52C
48DDD/F50DD/E52D
48DDDD/G50DDD/F52DD/E
48H50DDDD/G52DDD/F
48I50H52DDDD/G
48J50I52H
48K50J52I
48L50K52J
48M50L52K
48N50M52L
48O50N52M
48P50O52N
48R50P52O
48S50R52P
48T50S52R
If the bra band
is too big,
choose size:
Your current
US bra size:
If the bra band
is too small,
choose size:
50B52A54AA
50C52B54A
50D52C54B
50DD/E52D54C
50DDD/F52DD/E54D
50DDDD/G52DDD/F54DD/E
50H52DDDD/G54DDD/F
50I52H54DDDD/G
50J52I54H
50K52J54I
50L52K54J
50M52L54K
50N52M54L
50O52N54M
50P52O54N
50R52P54O
50S52R54P
50T52S54R
If the bra band
is too big,
choose size:
Your current
US bra size:
If the bra band
is too small,
choose size:
52B54A56AA
52C54B56A
52D54C56B
52DD/E54D56C
52DDD/F54DD/E56D
52DDDD/G54DDD/F56DD/E
52H54DDDD/G56DDD/F
52I54H56DDDD/G
52J54I56H
52K54J56I
52L54K56J
52M54L56K
52N54M56L
52O54N56M
52P54O56N
52R54P56O
52S54R56P
52T54S56R
If the bra band
is too big,
choose size:
Your current
US bra size:
If the bra band
is too small,
choose size:
54B56A58AA
54C56B58A
54D56C58B
54DD/E56D58C
54DDD/F56DD/E58D
54DDDD/G56DDD/F58DD/E
54H56DDDD/G58DDD/F
54I56H58DDDD/G
54J56I58H
54K56J58I
54L56K58J
54M56L58K
54N56M58L
54O56N58M
54P56O58N
54R56P58O
54S56R58P
54T56S58R
If the bra band
is too big,
choose size:
Your current
US bra size:
If the bra band
is too small,
choose size:
56B58A60AA
56C58B60A
56D58C60B
56DD/E58D60C
56DDD/F58DD/E60D
56DDDD/G58DDD/F60DD/E
56H58DDDD/G60DDD/F
56I58H60DDDD/G
56J58I60H
56K58J60I
56L58K60J
56M58L60K
56N58M60L
56O58N60M
56P58O60N
56R58P60O
56S58R60P
56T58S60R
If the bra band
is too big,
choose size:
Your current
US bra size:
If the bra band
is too small,
choose size:
58B60A62AA
58C60B62A
58D60C62B
58DD/E60D62C
58DDD/F60DD/E62D
58DDDD/G60DDD/F62DD/E
58H60DDDD/G62DDD/F
58I60H62DDDD/G
58J60I62H
58K60J62I
58L60K62J
58M60L62K
58N60M62L
58O60N62M
58P60O62N
58R60P62O
58S60R62P
58T60S62R
If the bra band
is too big,
choose size:
Your current
US bra size:
If the bra band
is too small,
choose size:
60B62A64AA
60C62B64A
60D62C64B
60DD/E62D64C
60DDD/F62DD/E64D
60DDDD/G62DDD/F64DD/E
60H62DDDD/G64DDD/F
60I62H64DDDD/G
60J62I64H
60K62J64I
60L62K64J
60M62L64K
60N62M64L
60O62N64M
60P62O64N
60R62P64O
60S62R64P
60T62S64R
If the bra band
is too big,
choose size:
Your current
US bra size:
If the bra band
is too small,
choose size:
62B64A66AA
62C64B66A
62D64C66B
62DD/E64D66C
62DDD/F64DD/E66D
62DDDD/G64DDD/F66DD/E
62H64DDDD/G66DDD/F
62I64H66DDDD/G
62J64I66H
62K64J66I
62L64K66J
62M64L66K
62N64M66L
62O64N66M
62P64O66N
62R64P66O
62S64R66P
62T64S66R

EU bra size conversion table for bra band size changes

EU-sizes / International
If the bra band
is too big,
choose size:
Your current
EU bra size:
If the bra band
is too small,
choose size:
55B60A65AA
55C60B65A
55D60C65B
55E60D65C
55F60E65D
55G60F65E
55H60G65F
55I60H65G
55J60I65H
55K60J65I
55L60K65J
55M60L65K
55N60M65L
55O60N65M
55P60O65N
55Q60P65O
55S60R65Q
55T60S65R
If the bra band
is too big,
choose size:
Your current
EU bra size:
If the bra band
is too small,
choose size:
60B65A70AA
60C65B70A
60D65C70B
60E65D70C
60F65E70D
60G65F70E
60H65G70F
60I65H70G
60J65I70H
60K65J70I
60L65K70J
60M65L70K
60N65M70L
60O65N70M
60P65O70N
60Q65P70O
60S65R70Q
60T65S70R
If the bra band
is too big,
choose size:
Your current
EU bra size:
If the bra band
is too small,
choose size:
65B70A75AA
65C70B75A
65D70C75B
65E70D75C
65F70E75D
65G70F75E
65H70G75F
65I70H75G
65J70I75H
65K70J75I
65L70K75J
65M70L75K
65N70M75L
65O70N75M
65P70O75N
65Q70P75O
65S70R75Q
65T70S75R
If the bra band
is too big,
choose size:
Your current
EU bra size:
If the bra band
is too small,
choose size:
70B75A80AA
70C75B80A
70D75C80B
70E75D80C
70F75E80D
70G75F80E
70H75G80F
70I75H80G
70J75I80H
70K75J80I
70L75K80J
70M75L80K
70N75M80L
70O75N80M
70P75O80N
70Q75P80O
70S75R80Q
70T75S80R
If the bra band
is too big,
choose size:
Your current
EU bra size:
If the bra band
is too small,
choose size:
75B80A85AA
75C80B85A
75D80C85B
75E80D85C
75F80E85D
75G80F85E
75H80G85F
75I80H85G
75J80I85H
75K80J85I
75L80K85J
75M80L85K
75N80M85L
75O80N85M
75P80O85N
75Q80P85O
75S80R85Q
75T80S85R
If the bra band
is too big,
choose size:
Your current
EU bra size:
If the bra band
is too small,
choose size:
80B85A90AA
80C85B90A
80D85C90B
80E85D90C
80F85E90D
80G85F90E
80H85G90F
80I85H90G
80J85I90H
80K85J90I
80L85K90J
80M85L90K
80N85M90L
80O85N90M
80P85O90N
80Q85P90O
80S85R90Q
80T85S90R
If the bra band
is too big,
choose size:
Your current
EU bra size:
If the bra band
is too small,
choose size:
85B90A95AA
85C90B95A
85D90C95B
85E90D95C
85F90E95D
85G90F95E
85H90G95F
85I90H95G
85J90I95H
85K90J95I
85L90K95J
85M90L95K
85N90M95L
85O90N95M
85P90O95N
85Q90P95O
85S90R95Q
85T90S95R
If the bra band
is too big,
choose size:
Your current
EU bra size:
If the bra band
is too small,
choose size:
90B95A100AA
90C95B100A
90D95C100B
90E95D100C
90F95E100D
90G95F100E
90H95G100F
90I95H100G
90J95I100H
90K95J100I
90L95K100J
90M95L100K
90N95M100L
90O95N100M
90P95O100N
90Q95P100O
90S95R100Q
90T95S100R
If the bra band
is too big,
choose size:
Your current
EU bra size:
If the bra band
is too small,
choose size:
95B100A105AA
95C100B105A
95D100C105B
95E100D105C
95F100E105D
95G100F105E
95H100G105F
95I100H105G
95J100I105H
95K100J105I
95L100K105J
95M100L105K
95N100M105L
95O100N105M
95P100O105N
95Q100P105O
95S100R105Q
95T100S105R
If the bra band
is too big,
choose size:
Your current
EU bra size:
If the bra band
is too small,
choose size:
100B105A110AA
100C105B110A
100D105C110B
100E105D110C
100F105E110D
100G105F110E
100H105G110F
100I105H110G
100J105I110H
100K105J110I
100L105K110J
100M105L110K
100N105M110L
100O105N110M
100P105O110N
100Q105P110O
100S105R110Q
100T105S110R
If the bra band
is too big,
choose size:
Your current
EU bra size:
If the bra band
is too small,
choose size:
105B110A115AA
105C110B115A
105D110C115B
105E110D115C
105F110E115D
105G110F115E
105H110G115F
105I110H115G
105J110I115H
105K110J115I
105L110K115J
105M110L115K
105N110M115L
105O110N115M
105P110O115N
105Q110P115O
105S110R115Q
105T110S115R
If the bra band
is too big,
choose size:
Your current
EU bra size:
If the bra band
is too small,
choose size:
110B115A120AA
110C115B120A
110D115C120B
110E115D120C
110F115E120D
110G115F120E
110H115G120F
110I115H120G
110J115I120H
110K115J120I
110L115K120J
110M115L120K
110N115M120L
110O115N120M
110P115O120N
110Q115P120O
110S115R120Q
110T115S120R
If the bra band
is too big,
choose size:
Your current
EU bra size:
If the bra band
is too small,
choose size:
115B120A125AA
115C120B125A
115D120C125B
115E120D125C
115F120E125D
115G120F125E
115H120G125F
115I120H125G
115J120I125H
115K120J125I
115L120K125J
115M120L125K
115N120M125L
115O120N125M
115P120O125N
115Q120P125O
115S120R125Q
115T120S125R
If the bra band
is too big,
choose size:
Your current
EU bra size:
If the bra band
is too small,
choose size:
120B125A130AA
120C125B130A
120D125C130B
120E125D130C
120F125E130D
120G125F130E
120H125G130F
120I125H130G
120J125I130H
120K125J130I
120L125K130J
120M125L130K
120N125M130L
120O125N130M
120P125O130N
120Q125P130O
120S125R130Q
120T125S130R
If the bra band
is too big,
choose size:
Your current
EU bra size:
If the bra band
is too small,
choose size:
125B130A135AA
125C130B135A
125D130C135B
125E130D135C
125F130E135D
125G130F135E
125H130G135F
125I130H135G
125J130I135H
125K130J135I
125L130K135J
125M130L135K
125N130M135L
125O130N135M
125P130O135N
125Q130P135O
125S130R135Q
125T130S135R
If the bra band
is too big,
choose size:
Your current
EU bra size:
If the bra band
is too small,
choose size:
130B135A140AA
130C135B140A
130D135C140B
130E135D140C
130F135E140D
130G135F140E
130H135G140F
130I135H140G
130J135I140H
130K135J140I
130L135K140J
130M135L140K
130N135M140L
130O135N140M
130P135O140N
130Q135P140O
130S135R140Q
130T135S140R
If the bra band
is too big,
choose size:
Your current
EU bra size:
If the bra band
is too small,
choose size:
135B140A145AA
135C140B145A
135D140C145B
135E140D145C
135F140E145D
135G140F145E
135H140G145F
135I140H145G
135J140I145H
135K140J145I
135L140K145J
135M140L145K
135N140M145L
135O140N145M
135P140O145N
135Q140P145O
135S140R145Q
135T140S145R
If the bra band
is too big,
choose size:
Your current
EU bra size:
If the bra band
is too small,
choose size:
140B145A150AA
140C145B150A
140D145C150B
140E145D150C
140F145E150D
140G145F150E
140H145G150F
140I145H150G
140J145I150H
140K145J150I
140L145K150J
140M145L150K
140N145M150L
140O145N150M
140P145O150N
140Q145P150O
140S145R150Q
140T145S150R
If the bra band
is too big,
choose size:
Your current
EU bra size:
If the bra band
is too small,
choose size:
145B150A155AA
145C150B155A
145D150C155B
145E150D155C
145F150E155D
145G150F155E
145H150G155F
145I150H155G
145J150I155H
145K150J155I
145L150K155J
145M150L155K
145N150M155L
145O150N155M
145P150O155N
145Q150P155O
145S150R155Q
145T150S155R

Click here to see our bra selection.