The Best Bras for 40K
A 40K is a selective size: 12 of the 49 brands we chart genuinely cut it, and most of them are specialists rather than accidents. The table below is computed from their published charts, shows each brand's own notation, and flags who carries it deep in their range versus at the edge.
40K in every system
Cup letters diverge above D, so the letter changes even though the bra does not. Convert by position, and match the printed tag in the table below.
Strong first tries at 40K
These are chosen by rule, not payment: your size sits inside each chart, away from its edges. The complete computed list follows.
The complete list: who makes 40K
| Brand | System | Their label for it | Range position | Interactive chart |
|---|---|---|---|---|
| Curvy Kate | UK | 40H | well in range | chart → |
| Elomi | UK | 40H | well in range | chart → |
| Fantasie | UK | 40H | well in range | chart → |
| Panache | UK | 40H | well in range | chart → |
| Anita | EU | 90K | at chart edge | chart → |
| Berlei | AU | 18H | at chart edge | chart → |
| Bravissimo | UK | 40H | at chart edge | chart → |
| Cacique | US | 40J | at chart edge | chart → |
| Freya | UK | 40H | at chart edge | chart → |
| M&S | UK | 40H | at chart edge | chart → |
| Pour Moi | UK | 40H | at chart edge | chart → |
| Shock Absorber | UK | 40H | at chart edge | chart → |
Of the 12: 4 carry 40K well inside their chart, 8 at its edge. Well in range means the size sits inside the brand's chart, cut from a block graded around it. At chart edge means it is the first or last size they make, which is real but drafted at the limit of their grading. Your measured size guide: the universal 40K page.
Is 40K actually your size?
Same published math as the calculator: snug measure, no added inches.
How to choose at 40K
40K sits where the two hard problems meet: a long band that must not fold and a deep cup that must not collapse, and a garment that solves both is structural in a way the rest of the market never needs to be. Three-column closures, side boning, wide cushioned straps and multi-part seamed cups are not premium extras at this size; they are the minimum architecture that works.
Prefer ranges built outward from a fuller-figure block rather than graded up from a mainstream one: the difference shows in wing height, closure width and how the cup seams distribute projection. The houses that treat this range as home, several of them below, cut it with a fit model at the center of it, and the wear difference is measurable by lunchtime.
Front-close and longline constructions earn genuine consideration here, not as compromises but as better physics: more torso contact means less migration, and a closure at the front removes the reach-and-twist that fatigues both wearer and band.
Care economics compound at this size: these bras cost more, so the rotation-and-hand-wash math from the money guides pays back fastest exactly here. Three rotated bras at this size outlast and outperform five worn carelessly.
Watch for: A band that folds or a wire that shifts here is an architecture failure before it is a size failure. Run the band tests on the loosest hook, and if a size passes them yet fails by afternoon, the construction, not the number, is what to change.
Constructions that work for a fuller band carrying serious depth, where band and cup engineering both peak
Each guide explains the construction, who it flatters and its honest trade-offs.
Sister sizes for 40K
A sister size keeps identical cup volume on a different band. If the 40K band rides up or digs in while the cup fits, the sister is the fix.
40K bras, answered
Which brands make a 40K bra?
Of the 49 brands whose published size charts we track, 12 cut a 40K. The strongest first tries: Elomi, Fantasie, Panache, Curvy Kate. The full table on this page lists every one in the brand's own notation, converted by chart position.
What is 40K in other sizing systems?
US: 40K. UK: 40H. EU / DE: 90K. FR / ES: 105K. AU / NZ: 18H. IT: 6ªK. JP: L90. Letters diverge above D, so always convert by position, not by letter.
What styles work best for 40K?
For a fuller band carrying serious depth, where band and cup engineering both peak: Side-support and full cup, Front-close, Longline, Minimizer, High-impact sports. A band that folds or a wire that shifts here is an architecture failure before it is a size failure. Run the band tests on the loosest hook, and if a size passes them yet fails by afternoon, the construction, not the number, is what to change.
Multi-brand retailers with deep size ranges
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HauteFlair labels cups in UK letters, so these links already convert your size by position (a US DDD lands on a UK E, a US G on a UK F). HauteFlair is owned by the same company as Brasize.ai; that relationship never changes the sizing math, charts, or fit advice on this page. How this site makes money.
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