Size conversion
What Is a 30M in Other Brands?
Bra sizes are not standardized: the same label means different things brand to brand, so your 30M is a starting point, not a fixed size. A US 30M usually needs a 30N in Victoria’s Secret, maps to a 30J in a true-to-size UK brand like Panache, and stays a 30M in Wacoal.
Your 30M in Victoria's Secret
30N
Cups run a full cup small, so size up
Your 30M in Panache
30J
True-to-size UK sizing
Your 30M in Wacoal
30M
True to size, year after year
Every brand we track
Your 30M, brand by brand
Grouped by the sizing system each brand labels its cups in. Brands we stock link to their full lineup.
US
US-sized brands
| Brand | How it runs | Your 30M → |
|---|---|---|
| ThirdLovein stock | cups run generous | 30M |
| Wacoalin stock | true to size | 30M |
| Glamorisein stock | true to size | 30M |
| SHEFITin stock | - | Adjustable XS-6Luxe sizing rather than standard band/cup; size by the brand chart. |
| b.tempt'din stock | true to size | 30M |
| Kindred Bravelyin stock | - | Uses XS-XXL nursing/maternity sizing rather than band/cup; size by the brand chart. |
| ENELLin stock | - | Uses numeric high-impact sizing (00-8) rather than band/cup; size by the brand chart. |
| Natori | cups run small | 30M |
| Bali | band runs large | 28M |
| Playtex | band runs large | 28M |
| Maidenform | true to size | 30M |
| Vanity Fair | band runs large | 30M |
| Calvin Klein | band runs small | 30M |
| Victoria's Secret | cups run small | 30N |
| Brooks | band runs small | 30M |
| Under Armour | - | Compression fit runs generous; XS-XL sizing rather than band/cup; size by the brand chart. |
| Nike | - | Generous fit; XS-XL sizing rather than band/cup; size by the brand chart. |
| Cacique | band runs large | 30M |
| Torrid | band runs large | 30M |
UK
UK-sized brands (cups run D, DD, E, F, FF, G...)
EU
EU-sized brands
| Brand | How it runs | Your 30M → |
|---|---|---|
| Chantelle | cups run small | 30M |
| Simone Perele | cups run small | 30M |
| PrimaDonna | true to size | 30M |
| Marie Jo | true to size | 30M |
| Triumph | band runs large | 30M |
| Anita | true to size | 30M |
Translations are guidance from cross-brand fit data, not a guarantee - fit also depends on breast shape and style. Cross-brand offset data v1-2026-05-28.
In stock now
Shop 30M now
Real bras we track in stock in 30M, with live prices.
Freya
Offbeat Side Support Bra: Rosehip
$68.00View →
Freya
Starlight Side Support Balcony Bra (J - O Cup): Caramel
$66.00View →
Freya
Starlight Side Support Balcony Bra (J - O Cup): Black
$66.00View →
Freya
Viva Side Support Bra: Lace Natural Beige
$66.00View →
Freya
Offbeat Side Support Bra: Natural Beige
$68.00View →
Freya
Offbeat Side Support Bra: Black
$68.00View →
Freya
Freya Fancies Balcony Bra (GG - K Cup): White
$64.00View →
Freya
Freya Fancies Balcony Bra (GG - K Cup): Natural Beige
$64.00View →
30M sister sizes
Sister sizes hold the same cup volume on a different band. If the 30M cup fits but the band doesn’t, try:
Interactive
Try your own size
Not a 30M? Enter any size to see it in every brand. Your size never leaves your browser.
Brand Size Translator
Find your size across different brands
30M
Why sizes vary: Each brand uses different patterns, materials, and fit philosophies. A 34DD in Victoria's Secret fits differently than a 34DD in Panache.
ThirdLove
US
Half-cup sizing available; cups run slightly generous.
30M
Wacoal
US
True to size; consistent fit across decades.
30M
Panache
UK
UK sizing; true to size, consistent year over year.
30J
Freya
UK
UK sizing; bands run snug.
30J
Elomi
UK
UK plus-size full-bust; cups run generous.
30J
Glamorise
US
US full-figure; true to size.
30M
SHEFIT
US
Adjustable XS-6Luxe sizing rather than standard band/cup; size by the brand chart.
30M
b.tempt'd
US
Wacoal-family fit DNA; runs true to US sizing, lighter construction.
30M
Kindred Bravely
US
Uses XS-XXL nursing/maternity sizing rather than band/cup; size by the brand chart.
30M
ENELL
US
Uses numeric high-impact sizing (00-8) rather than band/cup; size by the brand chart.
30M
Natori
US
Cups run small; consider sizing up.
30M
Chantelle
EU
French sizing; cups run small.
30M
Bali
US
Bands run loose; consider sizing down.
28M
Playtex
US
Bands run large; size down in band.
28M
Maidenform
US
Generally true to size.
30M
Vanity Fair
US
Bands run slightly loose.
30M
Calvin Klein
US
Bands run slightly snug.
30M
Victoria's Secret
US
Cups run very small; size up a full cup.
30N
Fantasie
UK
UK sizing; consistent fit.
30J
Curvy Kate
UK
UK sizing; bands run firm.
30J
Gossard
UK
UK sizing; classic fit.
30J
Pour Moi
UK
UK sizing; budget-friendly.
30J
Simone Perele
EU
French luxury; cups run small.
30M
PrimaDonna
EU
Belgian luxury; true EU sizing.
30M
Marie Jo
EU
Belgian; consistent fit.
30M
Triumph
EU
German; bands slightly generous.
30M
Anita
EU
German; strong post-surgery range.
30M
Brooks
US
Compression sports style; may run snug.
30M
Under Armour
US
Compression fit runs generous; XS-XL sizing rather than band/cup; size by the brand chart.
30M
Nike
US
Generous fit; XS-XL sizing rather than band/cup; size by the brand chart.
30M
Goddess
UK
UK sizing; strong plus-size range.
30J
Cacique
US
Lane Bryant's brand; bands run generous.
30M
Torrid
US
Plus-focused; bands run large.
30M
Common questions
30M conversion questions
- What is a 30M in Victoria's Secret?
- Victoria's Secret cups run about a full cup small, so a standard US 30M usually needs a 30N there. If you already wear a 30M in Victoria's Secret, your size in a true-to-size brand is likely a cup smaller.
- Which brands keep a 30M the same?
- In true-to-size brands a US 30M stays a 30M: Wacoal, Panache, Glamorise, b.tempt'd, Maidenform, Fantasie, Gossard, Pour Moi, PrimaDonna, Marie Jo, Anita, Goddess. Fit can still vary by style, so treat the label as the starting point.
- Do UK brands size a 30M differently from US brands?
- UK brands label cups in a different sequence above D (D, DD, E, F, FF, G), so the same letters can mean different volumes. In a true-to-size UK brand like Panache, a US 30M is a 30J; the band number stays the same.
- What size replaces a 30M in brands that don't use cup sizes?
- SHEFIT, Kindred Bravely, ENELL, Under Armour, Nike size by their own charts (XS-XL or numeric) instead of band/cup, so a 30M doesn't carry over directly. Start from each brand's chart with your underbust and bust measurements.