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30C Bras: A Standard C Cup — the Same in US, UK and EU
A 30C is a straightforward size to shop across borders. The band is a 30 in every system, and a C cup is written C in US, UK and EU sizing alike — the systems don't diverge until well above the D range.
Below: exactly what 30C converts to across US, UK and EU, where the systems agree, how to measure to be sure, your sister sizes, and the styles that suit a C cup.
What is a 30C bra size?
A 30C bra has a 30-inch underband and a C cup — and a C is written the same across systems. A UK 30C, US 30C and EU 65C all describe the same size: a bust roughly 3 inches larger than the band (around 33 inches around the fullest point). A, B and C sit well inside the range where US and UK sizing agree — they don't split until DDD/E — so it's an easy size to buy internationally. Sister sizes, holding the same cup volume, are 28D and 32B. Shop 30C bras in t-shirt, plunge, balconette, bralette, strapless and sports styles.
How to choose a bra at 30C
A C cup is well-served by most standard bras — but these five checks still decide whether it fits cleanly or shifts through the day.
| What to check | What good looks like | Why it matters |
|---|---|---|
| Band fit | Level all the way around, snug on the loosest hook, two fingers under it and no more | The band carries most of the support at any cup — a band that rides up shifts the load onto your shoulders |
| Cup shape | Moulded for a smooth line, or a bralette for softness — both work well at a C | A C is served by almost every construction; pick by the shape you want under clothes, not by necessity |
| Underwire | Wires that sit flat on the ribcage and encircle the breast without poking the underarm — or skip the wire entirely | A C is light enough that wire-free styles hold their shape, so comfort is a free choice here |
| Straps | Adjustable, comfortable, staying put without being cranked tight | At a C, standard straps are plenty; if they dig, the band is likely too loose |
| Gore & wings | Centre gore flat to the breastbone; wings smooth against the side | A floating gore means the cup is too small; smooth wings stop any side spillage |
30C in US, UK, EU and beyond
The same body, seven labels — and at a C cup the letter doesn't move. The band number changes system to system; the cup stays C.
| System | Size | How it's written |
|---|---|---|
| UK | 30C | The size on this page — the same letter everywhere |
| US | 30C | US and UK both write a 3-inch cup as C |
| EU | 65C | Band in centimetres; US 30 = EU 65. Cup still C |
| France / Spain | 80C | EU band plus 15 — same C cup, bigger number |
| Italy | — | Italian bands start at IT 1 (EU 70 / US 32) — no standard number this small |
| Australia / NZ | 8C | Numeric band (US 30 = AU 8), same C cup |
| Japan | 65C | EU band; Japanese cups run small, so size up one cup |
So is a US C the same as a UK C? Yes — at a C cup they're identical, both meaning a bust about 3 inches larger than the band. The systems only split much higher up: a UK DD is still a US DD, but a UK E is a US DDD, and a UK F is a US G. A C is nowhere near that split. See our full bra size conversion guide.
Find your 30C bra
Pick the card that matches what you need it for — then tap through to shop.
Everyday, under everything
A moulded t-shirt bra: smooth under knit, rounded shape, no seam showing through.
Shop t-shirt bras →Shape and lift
A plunge or balconette adds shape and opens the neckline — the going-out pick at this cup.
Shop all bras →Running, lifting, moving
A C is well covered by compression or lightly encapsulated sports bras. Pick by impact level.
Shop sports bras →Strapless that stays
A C is very wearable strapless — look for a firm band and silicone grip and it holds.
Shop strapless →Soft and wire-free
At a C, a bralette holds its shape — the easy comfortable option for low-key days.
Shop bralettes →Not sure it's your size?
If your current 30C gapes or the gore floats, the conversion or your measurements may be off. Start here.
Convert my size →The band does the lifting; the straps only steady it. A C cup is easy to fit well once the band is right — the gaping, the ride-up and the digging usually trace back to the band, not the cup.
The HauteFlair StandardThe complete 30C sizing guide
Measuring, where the systems agree, sister sizes, the fit tells and the vocabulary.
01How to measure for a 30C at home+
Two measurements, taken in a soft unpadded bra or none at all, tape level:
- Band: snug around the ribcage directly under the bust. A 30 band comes from an underbust near 29–31 inches.
- Bust: around the fullest point, tape parallel to the floor, not pulled tight. At 30C that lands around 33 inches.
- Cup: subtract band from bust. A 3-inch difference is a C; B and D are a cup either side.
The result is a starting size, not a verdict. Cut varies mill to mill, so let the fit checks below decide — and if you're on the line between letters, try the size plus its sister sizes.
02Where US and UK sizing agree — and where they split+
A C is safely inside the zone where both systems match. Here's the ladder:
- They agree through DD: A, B, C, D, DD read the same in US and UK. A 30C is a 30C in both.
- They split at DDD: above DD the US stacks another D (DDD) while the UK moves to E — so a UK E is a US DDD.
- From there they diverge: UK F is a US G, UK FF is a US H, and so on up the alphabet.
So a C cup is one you never have to convert. It's only above the D range that you need to check whether a chart is UK or US before trusting the letter.
03Sister sizes: 28D, 30C, 32B+
Cup volume moves with the band, so 30C has neighbours holding roughly the same cup:
- Down a band, up a cup: 28D — for a firmer band that feels tighter.
- Up a band, down a cup: 32B — for a looser band with the same cup room.
Reach for a sister size when the cup fits but the band doesn't, or when your exact size is out of stock in a style you want. What you should never do is loosen the band to fix the cup — that hands the support to your shoulders. The full logic is in our sister sizes guide.
04The five fit tells at a C cup+
Stand at a mirror. In order of usefulness:
- Band riding up at the back — band too loose. Go down a band, up a cup (your sister size).
- Gore floating off the breastbone — cup too small, or the wire is too narrow for you.
- Spillage at the top, underarm or under the wire — cup too small. Not a shape problem.
- Wrinkling or gaping at the top of the cup — cup too big, or the wrong style for your shape.
- Straps digging — you've tightened them to cover for a loose band. Fix the band first.
Check on the loosest hook when the bra is new; you move to the tighter hooks as the elastic relaxes over time.
0530C, C cup, 65C: the vocabulary+
- 30C — a 30 band with a C cup; the same in US and UK sizing.
- EU 65C — the same body; 65 is the band in centimetres, and the cup is still C.
- Standard cup — A, B and C are the everyday cups, stocked across nearly every style and brand.
- Sister size — a different band-and-cup pairing holding the same cup volume; 30C's are 28D and 32B.
- The split — above DD, US and UK letters diverge (UK E = US DDD). A C is well below it.
30C bras FAQ
The questions shoppers ask most, answered straight.
What is a 30C bra size?
A 30C has a 30-inch underband and a C cup. In US, UK and EU sizing a C cup is written the same way — it's a bust about 3 inches larger than the band (around 33 inches around the fullest point), which makes 30C a US 30C, a UK 30C and an EU 65C. It's a standard, widely stocked cup, well inside the range where the sizing systems agree.
Is 30C a big or small bra size?
A C is one of the standard everyday cups, on the smaller-to-middle side of the range, but the letter alone doesn't settle it. Cup volume is measured against the band, so a 30C holds more than a 28C (smaller band) and less than a 32C (larger band) even though all three read C. The band is half the size.
Is 30C a UK or US size?
Either — at a C cup it's the same. US and UK sizing agree all the way up to DD, and a C is well below that, so a UK 30C and a US 30C are identical. The two systems only split much higher up: a UK E is a US DDD, and a UK F is a US G.
What is a 30C in US sizing?
Also 30C. A 3-inch difference between bust and band is a C cup in both US and UK sizing, so the letter doesn't change. Only the larger UK cups (FF, GG) get rewritten in US letters — a C stays a C.
What is a 30C in EU sizing?
A 30C is an EU 65C. The band converts from inches to centimetres (30 inches = EU 65), but the cup letter stays C — A, B and C land on the same letter in US, UK and EU sizing. In France or Spain the same size reads 80C.
Is a 30C bigger than a 30B?
Yes, by one cup. On the same 30 band, each step up the alphabet adds cup volume, so a 30C is one cup larger than a 30B and one cup smaller than a 30D. If a B gapes at the top or a D spills over, C is the size in between.
What's the difference between 30C and 30D?
One cup. A D holds about an inch more projection than a C on the same band. If your 30C cup cuts in, spills over the top or the underarm, the next size up is 30D — not a bigger band.
What are the sister sizes for 30C?
28D and 32B — the same cup volume on a different band. Drop to 28D for a firmer band, move up to 32B for a looser one. Use a sister size when the cup fits but the band doesn't, or when your size is sold out in the style you want.
How do I measure for a 30C at home?
Measure snugly around your ribcage under the bust for the band, then around the fullest point with the tape level. Subtract the first from the second: a 3-inch difference on a 30 band points to a C cup. Treat it as a starting size and let the fit checks decide.
What bra styles work best for a 30C?
Most styles — a C is a well-served cup, so t-shirt, plunge, balconette, bralette, strapless and sports styles all come in it. A moulded t-shirt bra works smoothly under knits, a plunge or balconette shapes and lifts, and a wire-free bralette is an easy comfortable option at this cup.
Sizing guidance here is general. Bra sizing is not standardised — cup labelling, wire shape and band firmness vary by brand and style, so conversions are a starting point, not a guarantee. Always check the individual brand's size chart and treat any measurement as a place to begin. Size availability reflects current stock. Last reviewed August 2026.
Shop 30C bras
A C cup that reads the same in US, UK and EU — in t-shirt, plunge, balconette, bralette, strapless and sports styles, with bands that fit and cups that hold their shape.
