UK Bra Cup Size Chart – Cup Sizes in Order, How They Work & What They Mean
Bra sizing can feel confusing — especially when you're trying to figure out where you sit in the cup size sequence. This guide breaks down how UK bra cup sizes work, how they progress in order, and how to use the difference between your band and bust measurement to find your cup size.
If you haven't measured yet, start with our Bra Size Calculator — our bras are made to our own unique patterns and don't follow standard high street sizing, so measuring before you order is always the best place to start.
The Quick Answer: What Is a Bra Cup Size?
In the UK bra sizing system, your cup size is determined by the difference between your bra band size and your fullest bust measurement. Each cup size represents roughly a one-inch increase in that difference.
So if your bust measures 5 inches more than your band size, you're a DD cup. If it's 6 inches more, you're an E cup — and so on up the sequence.
UK Bra Cup Sizes in Order
The full UK cup size sequence runs:
AA → A → B → C → D → DD → E → F → FF → G → GG → H → HH → J → JJ → K → KK → L → LL → M → MM → N → NN → O
You'll notice the UK system uses double-letter cup sizes — DD, FF, GG, HH and so on. These aren't half sizes or unusual sizes; they're simply additional steps in the sequence that create a more gradual progression between volumes. Most UK lingerie brands use this extended system, and it's one of the reasons UK sizing tends to offer a more precise fit than some international systems.
At Designed by Debz, we size all the way from 3XS to 10XL and A to O cup — because we believe every body deserves a bra that actually fits.
UK Bra Cup Size Chart – Band vs Bust Difference
The table below shows how each UK cup size corresponds to the difference between your bra band size and your fullest bust measurement.
| Difference Between Band & 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 |
| 19 inches | M |
| 20 inches | MM |
| 21 inches | N |
| 22 inches | NN |
| 23 inches | O |
Cup Size and Band Size Work Together
One of the most important things to understand about bra sizing is that cup letters don't represent a fixed volume on their own. A 30GG and a 40GG are both GG cups — but they have very different bust volumes, because the cup size always works in relation to the band.
This is why we always recommend measuring both your underband and your fullest bust before ordering. Our bras are made to our own patterns across an inclusive size range — from 3XS to 10XL and A to O cup — so getting your measurements right makes all the difference.
Use our Bra Size Calculator to find your starting size.
How Cup Volume Changes Across Band Sizes
To give you a sense of how cup size and band size interact, here's how the bust measurement changes for the same cup letters across different band sizes:
| Band Size | F Cup | FF Cup | G Cup | GG Cup |
|---|---|---|---|---|
| 32 | 39" | 40" | 41" | 42" |
| 34 | 41" | 42" | 43" | 44" |
| 36 | 43" | 44" | 45" | 46" |
| 38 | 45" | 46" | 47" | 48" |
Common Cup Size Questions
What cup size comes after DD?
In the UK system, the cup size after DD is E. The sequence continues: E → F → FF → G → GG → H and so on, all the way up to O.
Are double cup sizes (DD, FF, GG) half sizes?
No — double cup sizes are full steps in the UK cup sequence. Each one represents the same one-inch increase in the difference between band and bust as any other cup size. They're not in-between sizes; they're simply part of how the UK system creates a more gradual, precise progression.
Is FF bigger than F?
Yes. FF is one cup size larger than F in the UK sequence.
Is GG bigger than G?
Yes. GG follows G in the UK cup size order.
What is the largest cup size?
The UK cup size sequence extends all the way to O cup and beyond in specialist sizing. At Designed by Debz, we make bras up to O cup — handmade in the UK to our own patterns, so every size gets the same care and attention as the rest of the range.
Does the same cup letter mean the same size in every brand?
Not always. Most UK lingerie brands use the extended UK cup sequence, but international brands sometimes use different progressions. If you're comparing sizes across brands, it's always worth checking the specific brand's size guide.
💜Find Your Designed by Debz Bra Size💜
Our bras are handmade in the UK to our own unique patterns — which means they don't follow standard high street sizing. We size inclusively across a wide range, from A to O cup, and we want every customer to find a fit that actually works for their body.
Start with our Bra Size Calculator to find your measurements, then browse our handmade bra collection to find your perfect fit.
