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US

40B

=
Italy

5B

Also: UK 40BEU 90BFR 105BAU 18BJP 90B

Nearby Sizes

US40AA→IT5AAUS40A→IT5A
US40B=IT5B
US40C→IT5CUS40D→IT5D

Try Another Size

Type a size to convert

Full Size Chart

US UK EU FR IT AU JP
30A30A65A80A0A8A65A
30AA30AA65AA80AA0AA8AA65AA
30B30B65B80B0B8B65B
30C30C65C80C0C8C65C
30D30D65D80D0D8D65D
30DD30DD65E80E0E8DD65E
30DDD30E65F80F0F8E65F
30G30F65G80G0G8F65G
30H30FF65H80H0H8FF65H
30I30G65I80I0I8G65I
30J30GG65J80J0J8GG65J
30K30H65K80K0K8H65K
32A32A70A85A1A10A70A
32AA32AA70AA85AA1AA10AA70AA
32B32B70B85B1B10B70B
32C32C70C85C1C10C70C
32D32D70D85D1D10D70D
32DD32DD70E85E1E10DD70E
32DDD32E70F85F1F10E70F
32G32F70G85G1G10F70G
32H32FF70H85H1H10FF70H
32I32G70I85I1I10G70I
32J32GG70J85J1J10GG70J
32K32H70K85K1K10H70K
34A34A75A90A2A12A75A
34AA34AA75AA90AA2AA12AA75AA
34B34B75B90B2B12B75B
34C34C75C90C2C12C75C
34D34D75D90D2D12D75D
34DD34DD75E90E2E12DD75E
34DDD34E75F90F2F12E75F
34G34F75G90G2G12F75G
34H34FF75H90H2H12FF75H
34I34G75I90I2I12G75I
34J34GG75J90J2J12GG75J
34K34H75K90K2K12H75K
36A36A80A95A3A14A80A
36AA36AA80AA95AA3AA14AA80AA
36B36B80B95B3B14B80B
36C36C80C95C3C14C80C
36D36D80D95D3D14D80D
36DD36DD80E95E3E14DD80E
36DDD36E80F95F3F14E80F
36G36F80G95G3G14F80G
36H36FF80H95H3H14FF80H
36I36G80I95I3I14G80I
36J36GG80J95J3J14GG80J
36K36H80K95K3K14H80K
38A38A85A100A4A16A85A
38AA38AA85AA100AA4AA16AA85AA
38B38B85B100B4B16B85B
38C38C85C100C4C16C85C
38D38D85D100D4D16D85D
38DD38DD85E100E4E16DD85E
38DDD38E85F100F4F16E85F
38G38F85G100G4G16F85G
38H38FF85H100H4H16FF85H
38I38G85I100I4I16G85I
38J38GG85J100J4J16GG85J
38K38H85K100K4K16H85K
40A40A90A105A5A18A90A
40AA40AA90AA105AA5AA18AA90AA
40B40B90B105B5B18B90B
40C40C90C105C5C18C90C
40D40D90D105D5D18D90D
40DD40DD90E105E5E18DD90E
40DDD40E90F105F5F18E90F
40G40F90G105G5G18F90G
40H40FF90H105H5H18FF90H
40I40G90I105I5I18G90I
40J40GG90J105J5J18GG90J
40K40H90K105K5K18H90K
42A42A95A110A6A20A95A
42AA42AA95AA110AA6AA20AA95AA
42B42B95B110B6B20B95B
42C42C95C110C6C20C95C
42D42D95D110D6D20D95D
42DD42DD95E110E6E20DD95E
42DDD42E95F110F6F20E95F
42G42F95G110G6G20F95G
42H42FF95H110H6H20FF95H
42I42G95I110I6I20G95I
42J42GG95J110J6J20GG95J
42K42H95K110K6K20H95K
44A44A100A115A7A22A100A
44AA44AA100AA115AA7AA22AA100AA
44B44B100B115B7B22B100B
44C44C100C115C7C22C100C
44D44D100D115D7D22D100D
44DD44DD100E115E7E22DD100E
44DDD44E100F115F7F22E100F
44G44F100G115G7G22F100G
44H44FF100H115H7H22FF100H
44I44G100I115I7I22G100I
44J44GG100J115J7J22GG100J
44K44H100K115K7K22H100K

Convert US 40B to Other Systems

UK40BEU90BFR105BAU18BJP90B

Looking for the IT equivalent of US 40B? In standard women's bra sizing, it converts to IT 5B. These conversions are based on industry-standard measurements. Individual brands may have minor sizing differences, so checking the brand's own sizing guide alongside this conversion can help ensure a perfect fit.

Frequently Asked Questions

What is US 40B in IT women's bra?
US size 40B in women's bra is equivalent to IT size 5B. This conversion is based on standard international sizing charts and is widely accepted across brands and retailers.
What is US 40B in other sizing systems?
US size 40B in women's bra converts to: UK 40B, EU 90B, FR 105B. Use our converter above to see all available systems.
Is US 40B the same as IT 5B?
Yes, US 40B is equivalent to IT 5B in standard women's bra sizing. However, fit can vary between brands, so trying on items or checking brand-specific size charts is always recommended.
How accurate are bra size conversions?
Our size conversions are based on international standards and verified against multiple authoritative sources. They represent the most widely accepted equivalents. However, individual brands may size slightly differently, so we recommend trying items on when possible or checking the brand's own size guide.

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Need help? Read our How to Measure Bra Size guide.