Double Cup Bra Sizes Explained – What DD, FF, GG & HH Mean
Bra cup sizes can be confusing, especially when double letters such as DD, FF, GG and HH appear in the sizing system. Many shoppers assume these sizes represent unusual or specialist measurements, but they are simply part of the standard UK bra size progression.
This guide explains what double cup bra sizes mean, why some brands use them, and how they fit into the wider UK cup size sequence used by fuller-bust lingerie brands.
If you are unsure of your starting size, begin with our Bra Size Calculator before exploring the cup size guides below.
What Are Double Cup Bra Sizes?
Double cup sizes are simply additional steps within the UK bra sizing sequence. Each cup size represents a 1 inch increase in the difference between the underband measurement and the fullest bust measurement.
Rather than jumping directly between some cup letters, the UK system sometimes inserts an additional step using a double letter such as FF, GG or HH.
This allows brands to offer a more gradual size progression and improves the chances of finding a comfortable fit.
UK Bra Cup Size Order and Measurement Chart
UK bra cup sizes follow a structured progression where each step represents a 1 inch increase in the difference between the bra band size and the fullest bust measurement.
Double-letter cups such as DD, FF, GG and HH are simply additional steps within the UK sizing sequence. They are not half cup sizes — each represents the same 1 inch increase as every other step.
Many lingerie brands follow the UK sizing system, which includes double-letter cups. You can also review independent sizing explanations from organisations such as Bratabase .
The full UK cup sequence used by specialist lingerie brands typically runs:
AA → A → B → C → D → DD → E → F → FF → G → GG → H → HH → J → JJ → K → KK → L → LL
You can explore detailed guides for each cup size in our UK bra cup size guides , including explanations of fit, band combinations and brand availability.
The most commonly recognised double cup size is DD, but UK bra sizing includes several double-letter cups such as FF, GG, HH, JJ and KK.
Understanding double cup bra sizes can make bra sizing much easier, especially when comparing brands that use the extended UK cup sequence.
The table below shows how UK bra cup sizes increase as the difference between the band size and the fullest bust measurement increases.
| Difference Between Band Size and Bust | UK Cup Size |
|---|---|
| 0 inches | AA |
| 1 inch | A |
| 2 inches | B |
| 3 inches | C |
| 4 inches | D |
| 5 inches | DD |
| 6 inches | E |
| 7 inches | F |
| 8 inches | FF |
| 9 inches | G |
| 10 inches | GG |
| 11 inches | H |
| 12 inches | HH |
| 13 inches | J |
| 14 inches | JJ |
| 15 inches | K |
| 16 inches | KK |
| 17 inches | L |
| 18 inches | LL |
Remember that cup size always works together with band size. For example, a 30GG, 36GG and 44GG are all different volumes even though the cup letter is the same. This is why bra sizing should always be considered as a combination of both band and cup size.
Many people ask which cup size comes next in the UK sequence. The table below shows how some common cup sizes progress.
| Cup Size | Next Cup Size |
|---|---|
| D | DD |
| DD | E |
| E | F |
| F | FF |
| FF | G |
| G | GG |
| GG | H |
| H | HH |
Understanding double cup bra sizes becomes easier when you look at individual cup guides. Explore our explanations for F cup bras, FF cup bras, GG cup bras and H cup bras.
Common Questions About Double Cup Sizes
Many people are confused by double cup letters in UK bra sizing. Here are some of the most common comparisons:
Yes. In the UK bra sizing sequence, FF comes after F. Each step represents the next cup size in the progression.
Yes. GG is the next size after G in the extended UK cup sequence used by many specialist lingerie brands.
Yes. H is the next cup size after GG in the UK bra size sequence.
No. Double letters like FF and GG are simply the next step in the UK cup progression, not half sizes.
Some brands follow a shorter cup progression and move directly between single letters. Fuller-bust specialist brands typically use the extended sequence because it provides more size options.
Double Cups in UK vs US Bra Sizes
Most UK lingerie brands use the extended cup sequence with double letters such as FF, GG and HH. Some US brands follow a slightly different progression, which can create confusion when comparing sizes internationally.
To understand how the systems relate, see our UK vs US bra size comparison guide .