Bra Band Size
Measure underbust and overbust into a bra band and cup size.
About Bra Band Size
The underbust rounds to the nearest even band, and the difference from the overbust sets the cup letter. An ill-fitting band carries most of the support, so a correct number prevents straps and discomfort.
Formula
Bra Band Size
Band = underbust rounded to even; cup = overbust - band
- underbust
- Tight ribcage measure under the bust
Worked example
With the default values below, Bra Band Size returns Band Size of 32. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Underbustminimum 24 in
- 32 in
- Overbustminimum 26 in
- 35 in
Results
- Band Size
- 32
- Cup Size
- C
- Full Size
- 32C
- Band (cm)
- 81 cm
Step by step
- 1Values used
- 2Bra Band Size
- 3Band Size= 32
- 4Cup Size= C
- 5Full Size= 32C
- 6Band (cm)= 81 cm
Assumptions and limits
- The result is derived only from the 2 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
- Figures are rounded for display to whole numbers, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
Frequently Asked Questions
How is Bra Band Size calculated?
Band = underbust rounded to even; cup = overbust - band The underbust rounds to the nearest even band, and the difference from the overbust sets the cup letter.
Why does Bra Band Size matter?
An ill-fitting band carries most of the support, so a correct number prevents straps and discomfort.
What values do I need to enter?
This calculator takes 2 inputs: Underbust, Overbust. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.