Conversion / Browser calculator

Bra Size Calculator

Bra Size Calculator works from the inputs you provide and returns approximate band (inches), illustrative uk cup. Use the calculation panel to explore a scenario, then check the formula and limitations before applying the result.

Free to useBrowser-based calculationFormula & example ↓

Your inputs

Minimum: 1e-06
Minimum: 1e-06

Your results

Enter your values and calculate to see the result.

Formula and calculation method

Illustrative UK band = nearest even inch to underbust. Cup step = nearest inch difference between bust and band.

A fitting starting point only. Brand fit, measurement methods and country cup labels differ.

How to use bra size calculator

  1. Set Underbust (cm). The example below uses 80.
  2. Set Bust (cm). The example below uses 95.
  3. Select Calculate to update the result. Reset restores the illustrated inputs. Copy, print or download your own result if you need a record.

Worked example

Example inputs
Underbust (cm)
80
Bust (cm)
95
Approximate band (inches)
32
Illustrative UK cup
DD

Factors affecting your result

A fitting starting point only. Brand fit, measurement methods and country cup labels differ.

Changing underbust (cm) changes the scenario being evaluated. Adjust one input at a time when comparing results, keep a copy of the assumptions, and compare values using the same unit and period. A precise arithmetic result does not make an uncertain assumption precise.

Frequently asked questions

How does the bra size calculator work?

Illustrative UK band = nearest even inch to underbust. Cup step = nearest inch difference between bust and band.

What inputs does Bra Size Calculator need?

Enter underbust (cm), bust (cm). Choose values that correspond to the same situation and measurement convention.

How should I interpret the bra size calculator result?

A fitting starting point only. Brand fit, measurement methods and country cup labels differ.

Are my bra size calculator inputs uploaded?

No. The calculation runs in this browser. Favorites, recent tool names, theme and formatting preferences may be saved locally, but calculation inputs are not sent to a calculation server or stored by this website. Shared links do not include entered values.

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