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Measure your underbust and fullest bust to estimate a practical starting bra size, compare international equivalents, and find nearby sister sizes.
32 in underbust · 36 in bust
Bra sizing is not perfectly standardized between brands and styles. Try the calculated size first, then use the sister-size suggestions if the band or cups need adjustment.
Use the two guide lines below to place the measuring tape consistently before entering your measurements.
Keep the tape level around the fullest point. It should touch the body without flattening or compressing the tissue.
Measure directly beneath the breast tissue. Keep the tape snug and horizontal around the rib cage.
Use a mirror or ask someone to confirm the tape is parallel to the floor, especially across your back.
Take both measurements while standing naturally. A non-padded bra can help when measuring the fullest bust.
Wrap the tape snugly around your rib cage directly beneath the bust. Keep the tape horizontal and record the measurement.
Wrap the tape around the fullest part of the bust. Keep it level and comfortably loose enough that it does not compress the tissue.
Enter both measurements, select inches or centimeters, and use the recommended size plus international and sister-size equivalents as fitting starting points.
Already know your bra size? Convert a US, UK, EU, French/Belgian/Spanish or Australian/New Zealand size to common international equivalents.
International conversions are common equivalents, not a guarantee of identical fit. Brand grading, cup shape and band stretch can vary.
The calculator converts your measurements to inches, rounds the underbust to a practical even band size, and uses the difference between the fullest bust and band size to estimate the cup. International sizes are then shown as common equivalents. Because brands use different grading and shapes, treat the result and conversions as fitting starting points rather than guaranteed matches.
A useful fit usually has a level band that feels secure without digging in, cups that contain the breast tissue without spilling or gaping, and a center gore that sits comfortably where the bra design allows. If only the band feels wrong, try the sister-size options shown with your result before changing cup volume.
About 1 inch of difference corresponds to an A cup, 2 inches to B, 3 inches to C, and so on. Cup lettering differs between sizing systems after D/DD.
Quick answers to the questions people most often ask about this calculator.
No. It is a starting size. Brand patterns, fabric, cup shape, breast shape and personal comfort can change which size fits best.
Sister sizes keep a similar cup volume while changing the band. Going down one band usually means going up one cup; going up one band usually means going down one cup.
They match through some smaller cup sizes but diverge in larger cup lettering, so use the international equivalents shown by the calculator rather than assuming the letters are identical.
Either is fine. Select the unit you used and the calculator converts internally before estimating the size.
There is no single universal fit standard across all manufacturers. Band stretch, cup depth, wire width and design can all change the fit.
We review calculator logic, labels, examples, and supporting information before publication. Results should still be checked against an appropriate professional or authoritative source when the decision is important.