How does the Bra Size Calculator work?

Band (US/UK): round under-bust up to nearest even inch Then: Cup: 1" diff = A, 2" = B, 3" = C, 4" = D, 5" = DD Then: Sister sizes share same cup volume (34C = 32D = 36B) Then: Measure bra-less at end of day.

Can you give an example of how to use the Bra Size Calculator?

Example: Input Under-bust 34", full bust 38" gives a result of Band 34; cup D → 34D.

Is the Bra Size Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Bra Size Calculator?

Our Bra Size Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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Bra Size Calculator

Band (under-bust) (in)

Bust (fullest part) (in)

Bra sizing uses under-bust for band size and bust-minus-band difference for cup. Studies suggest ~80% of women wear an incorrect size.

Symbol	Name	Unit	Description
UnderbustIn	Underbust circumference	Inches	—
OverbustIn	Overbust circumference	Inches	—
Diff	Overbust − Underbust	Inches (cup size)	—

Difference	Cup size
1"	A
2"	B
3"	C
4"	D
5"	DD/E
6"	DDD/F

References

›Bra fitting — ThirdLove

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Bra Size Calculator