How do I find my Wacoal bra size?

Use our bra size calculator above. Enter your bust and underbust measurements, and we'll find your Wacoal size in US, UK, EU, and AU systems. You can also convert from another brand if you already know your size.

What is a Wacoal 34C in UK size?

A Wacoal 34C in US is typically a 34C in UK sizing as well — the cup sizes align up through D. Use our size chart table above for the complete conversion, or try our interactive calculator for personalized results.

Do Wacoal bras run small or large?

Wacoal bras run true to size in both band and cup. If you wear a 36DD elsewhere, start with a 36DD in Wacoal. The exception is the Red Carpet strapless line, which has a tighter band by design — order your measured size, don't size down.

How does Wacoal sizing compare to ThirdLove?

Wacoal and ThirdLove use the same US sizing system, so a 34C is the same starting point in both brands. The differences are construction and range. Wacoal's full-figure cups (D+) are shaped fuller and offer more uplift than ThirdLove. ThirdLove offers half-cup sizes (34B½) that Wacoal doesn't — useful if you fall between standard cups.

Does the Wacoal minimizer change my size?

No — a Wacoal minimizer reduces projection by about one cup size of visual appearance, but you order your true measured size. A 36DD minimizer makes a 36DD bust look more like a 36D under clothing without changing the bra you buy. Don't size down for a minimizer.

Wacoal Bra Size Chart

Wacoal bra size chart for full-figure, minimizer, and plus-size bras. Convert Wacoal sizes between US, UK, EU, and AU. Trusted for support in larger cups.

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How to Measure for Wacoal

Illustration showing where to measure bust and underbust for bra sizing

Band (underbust) Bust (fullest point)

Measure your bust

Wrap a tape around the fullest part of your bust. Keep it level and not too tight.

Measure your underbust

Wrap the tape snugly around your ribcage, just below your breasts. Keep it level.

Enter your measurements

Use our calculator to get your size in US, UK, EU, and AU systems with sister sizes.

Wacoal Size Chart

Data verified Mar 2026 · Official size guide · See an error? Report it

Filter by band:

US	UK	EU	AU	Bust (cm)	Underbust (cm)
28A	28A	60A	6A	73	58
28B	28B	60B	6B	75	58
28C	28C	60C	6C	78	58
28D	28D	60D	6D	80	58
28DD	28DD	60E	6DD	83	58
28DDD	28E	60F	6E	85	58
28G	28F	60G	6F	88	58
28H	28FF	60H	6FF	90	58
30A	30A	65A	8A	78	63
30B	30B	65B	8B	80	63
30C	30C	65C	8C	83	63
30D	30D	65D	8D	85	63
30DD	30DD	65E	8DD	88	63
30DDD	30E	65F	8E	90	63
30G	30F	65G	8F	93	63
30H	30FF	65H	8FF	95	63
30I	30G	65I	8G	98	63
32A	32A	70A	10A	83	68
32B	32B	70B	10B	85	68
32C	32C	70C	10C	88	68
32D	32D	70D	10D	90	68
32DD	32DD	70E	10DD	93	68
32DDD	32E	70F	10E	95	68
32G	32F	70G	10F	98	68
32H	32FF	70H	10FF	100	68
32I	32G	70I	10G	103	68
34A	34A	75A	12A	88	73
34B	34B	75B	12B	90	73
34C	34C	75C	12C	93	73
34D	34D	75D	12D	95	73
34DD	34DD	75E	12DD	98	73
34DDD	34E	75F	12E	100	73
34G	34F	75G	12F	103	73
34H	34FF	75H	12FF	105	73
34I	34G	75I	12G	108	73
36A	36A	80A	14A	93	78
36B	36B	80B	14B	95	78
36C	36C	80C	14C	98	78
36D	36D	80D	14D	100	78
36DD	36DD	80E	14DD	103	78
36DDD	36E	80F	14E	105	78
36G	36F	80G	14F	108	78
36H	36FF	80H	14FF	110	78
36I	36G	80I	14G	113	78
38A	38A	85A	16A	98	83
38B	38B	85B	16B	100	83
38C	38C	85C	16C	103	83
38D	38D	85D	16D	105	83
38DD	38DD	85E	16DD	108	83
38DDD	38E	85F	16E	110	83
38G	38F	85G	16F	113	83
38H	38FF	85H	16FF	115	83
38I	38G	85I	16G	118	83
40A	40A	90A	18A	103	88
40B	40B	90B	18B	105	88
40C	40C	90C	18C	108	88
40D	40D	90D	18D	110	88
40DD	40DD	90E	18DD	113	88
40DDD	40E	90F	18E	115	88
40G	40F	90G	18F	118	88
40H	40FF	90H	18FF	120	88
40I	40G	90I	18G	123	88
42B	42B	95B	20B	110	93
42C	42C	95C	20C	113	93
42D	42D	95D	20D	115	93
42DD	42DD	95E	20DD	118	93
42DDD	42E	95F	20E	120	93
42G	42F	95G	20F	123	93
42H	42FF	95H	20FF	125	93
42I	42G	95I	20G	128	93
44B	44B	100B	22B	115	98
44C	44C	100C	22C	118	98
44D	44D	100D	22D	120	98
44DD	44DD	100E	22DD	123	98
44DDD	44E	100F	22E	125	98
44G	44F	100G	22F	128	98
44H	44FF	100H	22FF	130	98
44I	44G	100I	22G	133	98

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Sizes shown are based on standard US bra sizing. Wacoal may vary slightly — check Wacoal's official size chart for exact measurements.

What is the Wacoal sister size for 34C?

The Wacoal sister sizes for 34C are 32D (snugger band, same cup volume) and 36B (looser band, same cup volume). Wacoal follows the standard sister-size rule: go up one band size and down one cup, or down one band and up one cup, to hold the same cup volume.

Starting size: 34C
Snugger band, same volume: 32D
Looser band, same volume: 36B

How Wacoal Sizing Compares

If you wear a 34C in Wacoal, here's your likely size in other popular brands:

Brand	US Size	UK Size	EU Size	Fit
Wacoal	34C	34C	75C	true to size
Victoria's Secret	34C	34C	75C	true to size
Calvin Klein	34C	34C	75C	true to size
ThirdLove	34C	34C	75C	true to size
Savage x Fenty	34C	34C	75C	true to size
Aerie	34C	34C	75C	true to size

Sizes shown use standard charts. Actual fit may vary by style — always check the brand's specific size guide.

Wacoal Sizing & Fit Guide

Wacoal bras run true to size and are known for excellent support in larger cup sizes. Their minimizer bras reduce projection by about one cup size. Full-figure styles offer a secure, comfortable fit.

View Wacoal's official size guide

Do Wacoal Bras Run True to Size?

Wacoal bras run true to size in both band and cup across their core full-figure and minimizer lines. Their fit philosophy is built around long-haul comfort for cup sizes D and above, so the cups are shaped fuller and the bands sit firmly without digging. If you wear a 36DD in another brand, a Wacoal 36DD will be the same starting size — but you may notice the cup feels more supportive because of the seam construction. Minimizer styles like the Awareness Underwire reduce projection by roughly one cup size, which is a feel difference, not a sizing difference. If you're between sizes, Wacoal recommends sizing up in the cup before sizing up in the band — keep the band snug and let the cup carry the volume.

Wacoal Sister Sizes Explained

A sister size is a band/cup pair that holds the same cup volume but at a different band width. For Wacoal, the standard sister-size rule applies: go up one band and down one cup, or down one band and up one cup. So if 34C is your starting size, the sister sizes are 32D (snugger band, same volume) and 36B (looser band, same volume). The summary table above this guide lists the most common Wacoal sister-size pairings for a 34C starting size. Use a sister size when your measured band feels right but the cup gapes or digs, or when the band is too tight but the cup actually fits.

Wacoal Bra Lines and How Sizing Differs

Wacoal carries several distinct lines, each with a slightly different fit feel. Awareness Underwire is their bestselling full-coverage style and fits true to size — it's the safest starting point. Halo Lace runs the same on the band but has slightly fuller cups (good if you've spilled out of a similar bra elsewhere). Red Carpet is a strapless line with a tighter band by design — order true to size, don't size down. iPant shapewear-bra hybrids use band/cup sizing in the chest plus a separate hip size. The Basic Beauty seamless line runs true to size and tends to last longer than the lacy styles because there's less elasticity loss.

Wacoal Size Range

Wacoal carries bands from 30 to 44 and cups from A through I, with the densest selection in 32D-40H. This is one of the deepest full-bust ranges in mainstream lingerie — wider than Victoria's Secret (32-40, A-DDD) and matching specialty brands like Elomi. If you wear a 28 band, Wacoal doesn't have your size and you'll need a specialty fitter. For cups above DDD/F, Wacoal is one of the few brands with widespread retail availability.

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