Cup guide

HH Cup Size (UK)

An HH cup is a UK cup letter for a bust measurement 12 inches larger than the band. It sits between H and J on the UK ladder, past the end of the standard US alphabet, and it is an EU L.

What it means

What is an HH cup?

Quick answer

A HH cup in UK sizing means the fullest bust measurement is 12 inches (≈ 30 cm) larger than the underbust band. In US sizing the same 12-inch difference is labelled beyond K (some brands L); in EU sizing L. It is not a fixed volume: what the cup holds grows with the band it sits on.

HH cup on every bandTap a size

Same letter, nine volumes. A 28HH and a 44HH are both “HH cups”: the second holds several times the volume of the first.

By band

Every HH-cup size

The same 12-inch difference on each band. Read across for measurements, sister sizes and the EU / FR / AU labels; tap a size for its full guide.

Size	Underbust	Bust	Sister sizes	EU · FR · AU
28HH	27–28″ · 69–71 cm	40″ · 102 cm	— · 30H	60L · 75L · 6HH
30HH	29–30″ · 74–76 cm	42″ · 107 cm	28J · 32H	65L · 80L · 8HH
32HH	31–32″ · 79–81 cm	44″ · 112 cm	30J · 34H	70L · 85L · 10HH
34HH	33–34″ · 84–86 cm	46″ · 117 cm	32J · 36H	75L · 90L · 12HH
36HH	35–36″ · 89–91 cm	48″ · 122 cm	34J · 38H	80L · 95L · 14HH
38HH	37–38″ · 94–97 cm	50″ · 127 cm	36J · 40H	85L · 100L · 16HH
40HH	39–40″ · 99–102 cm	52″ · 132 cm	38J · 42H	90L · 105L · 18HH
42HH	41–42″ · 104–107 cm	54″ · 137 cm	40J · 44H	95L · 110L · 20HH
44HH	43–44″ · 109–112 cm	56″ · 142 cm	42J · —	100L · 115L · 22HH

At a glance

The HH cup, in numbers

Bust − band12″ · 30 cm

US letterbeyond K (some brands L)

EU · FR · IT · DEL

AU / NZ letterHH

Cup step12 of 15 (AA–K, UK)

Mainstream stockSpecialist, select styles

Volume is the pairing, not the letter. At 12 inches of difference the cup is beyond the range the clinical weight studies covered, so this site does not print a weight; on a 34 band its sisters are 32J and 36H.

Context

Is an HH cup big?

Twelve inches of difference is beyond the range the clinical weight studies covered, so this site does not print a weight for it; it is heavier than any K in US letters and belongs entirely to specialist manufacture. Fit at this depth is engineering: band, wire width and cup seaming carry the day.

HH has no clean US equivalent; US brands that reach it extend their alphabet their own way (some print L, some M), so a US letter here is a brand label, not a system.

Key takeaway: “HH cup” describes a 12-inch difference in UK letters. Volume depends on the band; convert by position, never by letter.

Myths and fit

What people get wrong about HH cups

The myth“HH is the largest cup.”The realityHH is the twelfth UK position; J, JJ and K follow. It is large, and it is not the top.

The myth“You must have measured wrong.”The realityTwelve inches of difference on a 30 band is unusual and real; it is the size the add-four rule turns into a 34G. Re-measure to check the tape was level, then trust the number.

Method check

Wearing an HH cup on a band that rides up?

The old +4 rule inflates the band by four inches and understates the cup by two letters. If a chart gave you a HH cup on a loose band, the snug-measure equivalent is two bands down and two cups up: the same volume, carried by the band.

If a +4 chart said	Snug-measure size is likely	Same volume?
32HH	28JJ	Yes: the band supports instead of the straps
34HH	30JJ	Yes: the band supports instead of the straps
36HH	32JJ	Yes: the band supports instead of the straps
38HH	34JJ	Yes: the band supports instead of the straps
40HH	36JJ	Yes: the band supports instead of the straps

Equivalents

HH cup in US, EU and other systems

USD

4″ difference. Matches UK and EU letters.

UKD

Identical to US. Full-bust specialists (Panache, Freya, Curvy Kate) label in UK letters.

EUD

Identical to US. FR, IT, DE and JP use EU cup letters.

Convert any exact size with the size converter.

Construction

Bra styles that fit an HH cup

Only seamed, side-supported full cups on wide, firm bands hold at this depth. Moulded and plunge cups are effectively unavailable, and strapless means a longline or bustier.

1On a small band (28–30)

Frame like a 28 band, also look for narrower wires and shorter straps The same HH cup is deeper and narrower here.

2On an average band (32–36)

The widest choice of styles at this cup. Molded for a smooth line, seamed for shape and lift.

3On a larger band (38–44)

The HH cup is wider and shallower; prioritise a firm, wide band and a wire that fully encloses the root. Longline and three-hook styles help.

Shape matters as much as size: see the fit guide for the five breast shapes and the constructions that suit each.

Answered

HH cup: answered

How big is an HH cup?

An HH cup is a bust 12 inches (30 cm) larger than the band, the twelfth UK cup letter. It is beyond the standard US alphabet (K is the eleventh position) and equivalent to an EU L.

What is an HH cup in US sizes?

There is no standard US letter; K is the last US position at eleven inches. US brands that cut this depth extend their alphabet individually, most often to L. Convert by position, then check the brand’s own chart.

Is HH bigger than J?

No: in UK sizing HH is the twelfth cup and J the thirteenth, one inch deeper.

What are the sister sizes of a 32HH?

A 30J and a 34H in UK letters hold the same volume as a 32HH.

Which brands make HH cups?

A subset of UK full-bust specialists on select styles; the brand dossiers record where each range ends. Above this, made-to-order makers begin.

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