Worked example: Bra Size Calculator
34 band, 38 bust. This fixed reference example shows one complete scenario; the interactive results above use your current inputs.
View the example inputs
- Chosen UK band size
- 34 in
- Full bust circumference
- 38 in
| Calculated quantity | Example result |
|---|---|
| Starting UK size estimate | 34D |
| Rounded cup difference | 4 in |
Understand the inputs, method and result
Interpret this calculation in its stated scope
Estimate a UK cup letter from a chosen band size and full-bust measurement.
Choose a comfortable, correctly fitted even-numbered UK band first. This tool does not automatically add inches to an underbust measurement. Brand patterns and cup sequences vary; this is a starting estimate for trying on.
Compare inputs and results consistently
Begin with the quantity named by this calculator and the format required by each field. The example below records a complete set of inputs and the corresponding calculated output. Change one input at a time to see which part of the result depends on it.
Use the formula notes to check units, rounding and supported operations. A reference result validates the stated calculation; it does not add information that was never entered. Any limits or entertainment-only purpose are described on this page.
Formula and calculation method
Uses a stated one-inch cup-difference convention: rounded(bust−chosen band), with 1=A, 2=B, 3=C, 4=D, 5=DD, 6=E, 7=F, 8=FF, 9=G, 10=GG, 11=H, 12=HH, 13=J, 14=JJ, 15=K.
Choose a comfortable, correctly fitted even-numbered UK band first. This tool does not automatically add inches to an underbust measurement. Brand patterns and cup sequences vary; this is a starting estimate for trying on.
Frequently asked questions
How does this calculator work?
Uses a stated one-inch cup-difference convention: rounded(bust−chosen band), with 1=A, 2=B, 3=C, 4=D, 5=DD, 6=E, 7=F, 8=FF, 9=G, 10=GG, 11=H, 12=HH, 13=J, 14=JJ, 15=K.
What assumptions should I check?
Choose a comfortable, correctly fitted even-numbered UK band first. This tool does not automatically add inches to an underbust measurement. Brand patterns and cup sequences vary; this is a starting estimate for trying on.
Can I save or print this calculation?
Use Copy link with inputs to reproduce the scenario, Download results for a text record, or Print. Where a schedule is shown, its CSV download includes every row.