Size chart

UK bra size chart

The tables behind our calculator: which underbust gives which band, which bust gives which cup, in inches and centimetres.

Sources checked 17 October 2026

A white tape measure with inch markings on a pale background — Photo: Gabriel Mihalcea (opens in a new tab) on Unsplash

Bust measurements for each cup

Pick a UK band to see which bust measurement gives each cup on that band.

UK band

UK band 28: bust measurement for each cup
Size	Bust (inches)	Bust (cm)
28A	28.5 to under 29.5	72.4 to under 74.9
28B	29.5 to under 30.5	74.9 to under 77.5
28C	30.5 to under 31.5	77.5 to under 80
28D	31.5 to under 32.5	80 to under 82.6
28DD	32.5 to under 33.5	82.6 to under 85.1
28E	33.5 to under 34.5	85.1 to under 87.6
28F	34.5 to under 35.5	87.6 to under 90.2
28FF	35.5 to under 36.5	90.2 to under 92.7
28G	36.5 to under 37.5	92.7 to under 95.3
28GG	37.5 to under 38.5	95.3 to under 97.8
28H	38.5 to under 39.5	97.8 to under 100.3
28HH	39.5 to under 40.5	100.3 to under 102.9
28J	40.5 to under 41.5	102.9 to under 105.4
28JJ	41.5 to under 42.5	105.4 to under 108
28K	42.5 to under 43.5	108 to under 110.5

UK band 30: bust measurement for each cup
Size	Bust (inches)	Bust (cm)
30A	30.5 to under 31.5	77.5 to under 80
30B	31.5 to under 32.5	80 to under 82.6
30C	32.5 to under 33.5	82.6 to under 85.1
30D	33.5 to under 34.5	85.1 to under 87.6
30DD	34.5 to under 35.5	87.6 to under 90.2
30E	35.5 to under 36.5	90.2 to under 92.7
30F	36.5 to under 37.5	92.7 to under 95.3
30FF	37.5 to under 38.5	95.3 to under 97.8
30G	38.5 to under 39.5	97.8 to under 100.3
30GG	39.5 to under 40.5	100.3 to under 102.9
30H	40.5 to under 41.5	102.9 to under 105.4
30HH	41.5 to under 42.5	105.4 to under 108
30J	42.5 to under 43.5	108 to under 110.5
30JJ	43.5 to under 44.5	110.5 to under 113
30K	44.5 to under 45.5	113 to under 115.6

UK band 32: bust measurement for each cup
Size	Bust (inches)	Bust (cm)
32A	32.5 to under 33.5	82.6 to under 85.1
32B	33.5 to under 34.5	85.1 to under 87.6
32C	34.5 to under 35.5	87.6 to under 90.2
32D	35.5 to under 36.5	90.2 to under 92.7
32DD	36.5 to under 37.5	92.7 to under 95.3
32E	37.5 to under 38.5	95.3 to under 97.8
32F	38.5 to under 39.5	97.8 to under 100.3
32FF	39.5 to under 40.5	100.3 to under 102.9
32G	40.5 to under 41.5	102.9 to under 105.4
32GG	41.5 to under 42.5	105.4 to under 108
32H	42.5 to under 43.5	108 to under 110.5
32HH	43.5 to under 44.5	110.5 to under 113
32J	44.5 to under 45.5	113 to under 115.6
32JJ	45.5 to under 46.5	115.6 to under 118.1
32K	46.5 to under 47.5	118.1 to under 120.7

UK band 34: bust measurement for each cup
Size	Bust (inches)	Bust (cm)
34A	34.5 to under 35.5	87.6 to under 90.2
34B	35.5 to under 36.5	90.2 to under 92.7
34C	36.5 to under 37.5	92.7 to under 95.3
34D	37.5 to under 38.5	95.3 to under 97.8
34DD	38.5 to under 39.5	97.8 to under 100.3
34E	39.5 to under 40.5	100.3 to under 102.9
34F	40.5 to under 41.5	102.9 to under 105.4
34FF	41.5 to under 42.5	105.4 to under 108
34G	42.5 to under 43.5	108 to under 110.5
34GG	43.5 to under 44.5	110.5 to under 113
34H	44.5 to under 45.5	113 to under 115.6
34HH	45.5 to under 46.5	115.6 to under 118.1
34J	46.5 to under 47.5	118.1 to under 120.7
34JJ	47.5 to under 48.5	120.7 to under 123.2
34K	48.5 to under 49.5	123.2 to under 125.7

UK band 36: bust measurement for each cup
Size	Bust (inches)	Bust (cm)
36A	36.5 to under 37.5	92.7 to under 95.3
36B	37.5 to under 38.5	95.3 to under 97.8
36C	38.5 to under 39.5	97.8 to under 100.3
36D	39.5 to under 40.5	100.3 to under 102.9
36DD	40.5 to under 41.5	102.9 to under 105.4
36E	41.5 to under 42.5	105.4 to under 108
36F	42.5 to under 43.5	108 to under 110.5
36FF	43.5 to under 44.5	110.5 to under 113
36G	44.5 to under 45.5	113 to under 115.6
36GG	45.5 to under 46.5	115.6 to under 118.1
36H	46.5 to under 47.5	118.1 to under 120.7
36HH	47.5 to under 48.5	120.7 to under 123.2
36J	48.5 to under 49.5	123.2 to under 125.7
36JJ	49.5 to under 50.5	125.7 to under 128.3
36K	50.5 to under 51.5	128.3 to under 130.8

UK band 38: bust measurement for each cup
Size	Bust (inches)	Bust (cm)
38A	38.5 to under 39.5	97.8 to under 100.3
38B	39.5 to under 40.5	100.3 to under 102.9
38C	40.5 to under 41.5	102.9 to under 105.4
38D	41.5 to under 42.5	105.4 to under 108
38DD	42.5 to under 43.5	108 to under 110.5
38E	43.5 to under 44.5	110.5 to under 113
38F	44.5 to under 45.5	113 to under 115.6
38FF	45.5 to under 46.5	115.6 to under 118.1
38G	46.5 to under 47.5	118.1 to under 120.7
38GG	47.5 to under 48.5	120.7 to under 123.2
38H	48.5 to under 49.5	123.2 to under 125.7
38HH	49.5 to under 50.5	125.7 to under 128.3
38J	50.5 to under 51.5	128.3 to under 130.8
38JJ	51.5 to under 52.5	130.8 to under 133.4
38K	52.5 to under 53.5	133.4 to under 135.9

UK band 40: bust measurement for each cup
Size	Bust (inches)	Bust (cm)
40A	40.5 to under 41.5	102.9 to under 105.4
40B	41.5 to under 42.5	105.4 to under 108
40C	42.5 to under 43.5	108 to under 110.5
40D	43.5 to under 44.5	110.5 to under 113
40DD	44.5 to under 45.5	113 to under 115.6
40E	45.5 to under 46.5	115.6 to under 118.1
40F	46.5 to under 47.5	118.1 to under 120.7
40FF	47.5 to under 48.5	120.7 to under 123.2
40G	48.5 to under 49.5	123.2 to under 125.7
40GG	49.5 to under 50.5	125.7 to under 128.3
40H	50.5 to under 51.5	128.3 to under 130.8
40HH	51.5 to under 52.5	130.8 to under 133.4
40J	52.5 to under 53.5	133.4 to under 135.9
40JJ	53.5 to under 54.5	135.9 to under 138.4
40K	54.5 to under 55.5	138.4 to under 141

UK band 42: bust measurement for each cup
Size	Bust (inches)	Bust (cm)
42A	42.5 to under 43.5	108 to under 110.5
42B	43.5 to under 44.5	110.5 to under 113
42C	44.5 to under 45.5	113 to under 115.6
42D	45.5 to under 46.5	115.6 to under 118.1
42DD	46.5 to under 47.5	118.1 to under 120.7
42E	47.5 to under 48.5	120.7 to under 123.2
42F	48.5 to under 49.5	123.2 to under 125.7
42FF	49.5 to under 50.5	125.7 to under 128.3
42G	50.5 to under 51.5	128.3 to under 130.8
42GG	51.5 to under 52.5	130.8 to under 133.4
42H	52.5 to under 53.5	133.4 to under 135.9
42HH	53.5 to under 54.5	135.9 to under 138.4
42J	54.5 to under 55.5	138.4 to under 141
42JJ	55.5 to under 56.5	141 to under 143.5
42K	56.5 to under 57.5	143.5 to under 146.1

UK band 44: bust measurement for each cup
Size	Bust (inches)	Bust (cm)
44A	44.5 to under 45.5	113 to under 115.6
44B	45.5 to under 46.5	115.6 to under 118.1
44C	46.5 to under 47.5	118.1 to under 120.7
44D	47.5 to under 48.5	120.7 to under 123.2
44DD	48.5 to under 49.5	123.2 to under 125.7
44E	49.5 to under 50.5	125.7 to under 128.3
44F	50.5 to under 51.5	128.3 to under 130.8
44FF	51.5 to under 52.5	130.8 to under 133.4
44G	52.5 to under 53.5	133.4 to under 135.9
44GG	53.5 to under 54.5	135.9 to under 138.4
44H	54.5 to under 55.5	138.4 to under 141
44HH	55.5 to under 56.5	141 to under 143.5
44J	56.5 to under 57.5	143.5 to under 146.1
44JJ	57.5 to under 58.5	146.1 to under 148.6
44K	58.5 to under 59.5	148.6 to under 151.1

UK band 46: bust measurement for each cup
Size	Bust (inches)	Bust (cm)
46A	46.5 to under 47.5	118.1 to under 120.7
46B	47.5 to under 48.5	120.7 to under 123.2
46C	48.5 to under 49.5	123.2 to under 125.7
46D	49.5 to under 50.5	125.7 to under 128.3
46DD	50.5 to under 51.5	128.3 to under 130.8
46E	51.5 to under 52.5	130.8 to under 133.4
46F	52.5 to under 53.5	133.4 to under 135.9
46FF	53.5 to under 54.5	135.9 to under 138.4
46G	54.5 to under 55.5	138.4 to under 141
46GG	55.5 to under 56.5	141 to under 143.5
46H	56.5 to under 57.5	143.5 to under 146.1
46HH	57.5 to under 58.5	146.1 to under 148.6
46J	58.5 to under 59.5	148.6 to under 151.1
46JJ	59.5 to under 60.5	151.1 to under 153.7
46K	60.5 to under 61.5	153.7 to under 156.2

UK band 48: bust measurement for each cup
Size	Bust (inches)	Bust (cm)
48A	48.5 to under 49.5	123.2 to under 125.7
48B	49.5 to under 50.5	125.7 to under 128.3
48C	50.5 to under 51.5	128.3 to under 130.8
48D	51.5 to under 52.5	130.8 to under 133.4
48DD	52.5 to under 53.5	133.4 to under 135.9
48E	53.5 to under 54.5	135.9 to under 138.4
48F	54.5 to under 55.5	138.4 to under 141
48FF	55.5 to under 56.5	141 to under 143.5
48G	56.5 to under 57.5	143.5 to under 146.1
48GG	57.5 to under 58.5	146.1 to under 148.6
48H	58.5 to under 59.5	148.6 to under 151.1
48HH	59.5 to under 60.5	151.1 to under 153.7
48J	60.5 to under 61.5	153.7 to under 156.2
48JJ	61.5 to under 62.5	156.2 to under 158.8
48K	62.5 to under 63.5	158.8 to under 161.3

The bust is rounded to the nearest inch (halves round up), so each cup covers one inch of bust measurement. Cups above K are not in the published table; see the note below the cup table.

Underbust to band

Round the underbust up to a whole inch, then up to an even number. Nothing is added.

Underbust measurement to UK band
UK band	Underbust (inches)	Underbust (cm)
28	over 26 up to 28	over 66 up to 71.1
30	over 28 up to 30	over 71.1 up to 76.2
32	over 30 up to 32	over 76.2 up to 81.3
34	over 32 up to 34	over 81.3 up to 86.4
36	over 34 up to 36	over 86.4 up to 91.4
38	over 36 up to 38	over 91.4 up to 96.5
40	over 38 up to 40	over 96.5 up to 101.6
42	over 40 up to 42	over 101.6 up to 106.7
44	over 42 up to 44	over 106.7 up to 111.8
46	over 44 up to 46	over 111.8 up to 116.8
48	over 46 up to 48	over 116.8 up to 121.9

Difference to cup

Rounded bust minus band, in inches. One inch is one cup step.

Inches of difference to UK cup
Difference	UK cup
1 in	A
2 in	B
3 in	C
4 in	D
5 in	DD
6 in	E
7 in	F
8 in	FF
9 in	G
10 in	GG
11 in	H
12 in	HH
13 in	J
14 in	JJ
15 in	K

This is Brastop’s published table (1 inch to 15 inches). Our calculator continues the UK cup order to KK (16) and L (17) and says when it has done so. A difference of 0 or less has no published rule.

The UK cup order

UK cups use double letters from D onwards, and there is no I cup. This is the order every UK brand table we checked follows.

34: the band: Your underbust in inches, rounded up to an even number. When the bra is on, the band should sit firm and level around your ribcage.
DD: the cup: How much larger your bust is than the band, at roughly one cup step per inch. UK cups use double letters: D, DD, E, F, FF, G, GG, H and so on.

UK bands on other labels

Band labels are consistent across every brand chart we checked. Cup letters are not, so use the bra size converter for full sizes.

UK band and its US, EU, French and Australian label
UK	US	EU	French	AU/NZ
28	28	60	75	6
30	30	65	80	8
32	32	70	85	10
34	34	75	90	12
36	36	80	95	14
38	38	85	100	16
40	40	90	105	18
42	42	95	110	20
44	44	100	115	22
46	46	105	120	24
48	48	110	125	26

Sources

Checked 17 October 2026. Brands change their charts, so check the retailer’s own size guide before you buy.

S1 Brastop: How to measure your bra size (opens in a new tab) Tape method; inches-to-cup table (A to K); rounding rules
S4 Boux Avenue: How to measure bra size (opens in a new tab) Tape method; worked example 39 − 34 = 5 (DD); sister sizes; limits of measuring
S2 Brastop: Bra fitting size charts (opens in a new tab) UK, US, EU, French and Australian band and cup conversion
S9 Freya: Size guide (UK) (opens in a new tab) International conversion; UK sizing statement; size range
S5 Curvy Kate: Bra fitting size guide (opens in a new tab) Conversion table; EU labels that skip the letter I
S12 Elomi: Elomi size guide (UK) (opens in a new tab) Conversion up to KK; size range
S18 Bravissimo: Bra sizing explained (US site, conversion charts) (opens in a new tab) UK to US, EU and French conversion up to L

UK	US	EU	French	AU/NZ
28	28	60	75	6
30	30	65	80	8
32	32	70	85	10
34	34	75	90	12
36	36	80	95	14
38	38	85	100	16
40	40	90	105	18
42	42	95	110	20
44	44	100	115	22
46	46	105	120	24
48	48	110	125	26

UK	US	EU	French	AU/NZ
28	28	60	75	6
30	30	65	80	8
32	32	70	85	10
34	34	75	90	12
36	36	80	95	14
38	38	85	100	16
40	40	90	105	18
42	42	95	110	20
44	44	100	115	22
46	46	105	120	24
48	48	110	125	26