How do I find my ThirdLove bra size?

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

What is a ThirdLove 34C in UK size?

A ThirdLove 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.

What are ThirdLove half-cup sizes?

ThirdLove offers half-cup sizes like 34B½ that sit between standard cup sizes. If a 34B feels slightly small but a 34C is too big, a 34B½ may be your perfect fit. No other major brand offers this level of precision.

How does ThirdLove sizing compare to Victoria's Secret?

ThirdLove and Victoria's Secret use the same US sizing, so a 34C should be the same in both. ThirdLove offers a wider range (up to 48H) and half-cup sizes for a more precise fit. ThirdLove bras also tend to have more consistent sizing across styles since they use less padding variation than VS.

Is ThirdLove true to size?

Yes, ThirdLove bras run true to size. Their Fit Finder quiz helps you find your exact size, including half-cups. If you know your size in another brand, it should translate directly to ThirdLove — then try a half-cup up or down if the fit isn't perfect.

ThirdLove Bra Size Chart

ThirdLove bra size chart with half-cup sizes for a more precise fit. Convert ThirdLove sizes between US, UK, EU, and AU. Find your perfect ThirdLove bra.

Size range: 30A–48H

Find my ThirdLove size

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How to Measure for ThirdLove

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.

ThirdLove Size Chart

Data verified Apr 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. ThirdLove may vary slightly — check ThirdLove's official size chart for exact measurements.

What is the ThirdLove sister size for 32B?

The ThirdLove sister sizes for 32B are 30C (snugger band, same cup volume) and 34A (looser band, same cup volume). ThirdLove also offers half-cup sizes (32A½, 32B½) between standard cups, so if 32B feels slightly big and 30C is too snug, try 32A½ or 32B½ — half-cups are unique to ThirdLove among major brands.

Starting size: 32B
Snugger band, same volume: 30C
Looser band, same volume: 34A
Half-cup options: 32A½, 32B½

How ThirdLove Sizing Compares

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

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

ThirdLove Sizing & Fit Guide

ThirdLove is known for their half-cup sizes (e.g., 34.5B) which provide a more precise fit between standard cup sizes. Their bras tend to run true to size with a focus on comfort.

View ThirdLove's official size guide

ThirdLove Half-Cup Sizes Explained

ThirdLove is the only major bra brand offering half-cup sizes, designed for women who fall between standard cup sizes. If a 34B feels slightly too small but a 34C has gaps at the top, ThirdLove's 34B½ bridges that gap. Half-cup sizes are available across most of their range and in their most popular styles including the 24/7 Classic T-Shirt Bra and Fit Finder Bra. This precision sizing means fewer women need to compromise on fit — ThirdLove estimates that nearly half of women wear a half-cup size.

How ThirdLove Sizing Compares to Other Brands

ThirdLove uses standard US bra sizing for band and cup, so a 34C in ThirdLove is the same starting point as a 34C in Victoria's Secret, Calvin Klein, or any other US brand. Where ThirdLove differs is range and precision: they go up to 48H (wider than most brands) and offer half-cups between every whole size. Their bras also have more consistent sizing across styles — unlike brands where a push-up 34C fits differently from a T-shirt bra 34C, ThirdLove designs all styles to fit the same within a given size.

ThirdLove Size Range and Inclusivity

ThirdLove offers one of the widest size ranges of any direct-to-consumer bra brand: bands from 30 to 48 and cups from A through H, plus half-cup sizes throughout. This covers an estimated 80+ unique sizes when including half-cups. By comparison, Victoria's Secret tops out around 40DDD and Calvin Klein at 38DD. If you're outside the range of most mainstream brands, ThirdLove is worth trying — particularly for cup sizes above DD or band sizes above 40.

Compare ThirdLove Sizing

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Find my ThirdLove size

How to Measure for ThirdLove

ThirdLove Size Chart

Own a ThirdLove bra? Tell us how it fit.

What is the ThirdLove sister size for 32B?

How ThirdLove Sizing Compares

ThirdLove Sizing & Fit Guide

ThirdLove Half-Cup Sizes Explained

How ThirdLove Sizing Compares to Other Brands

ThirdLove Size Range and Inclusivity

Compare ThirdLove Sizing

Related Bra Size Charts

Frequently Asked Questions