Bra Size Conversion Table
Convert bra band and cup sizes between Taiwan, US/UK, Europe, and Japan sizing systems.
Data last maintained
Bra Size Conversion Table
Convert bra band and cup sizes between Taiwan, US/UK, Europe, and Japan sizing systems.
Data last maintained
About Bra Size Conversion Table
Band, cup, and regional notation
The table separates band size from cup difference so Taiwan, US, UK, Europe, France, Japan, and Australia notations can be compared without mixing two measurement systems. Use the band tab for underbust ranges and the cup tab for bust-minus-underbust differences.
Measurement helper and sister sizes
Enter underbust and bust measurements to highlight the closest band and cup rows, then use the measurement reminders and sister-size examples to discuss nearby sizes. The helper is meant to reduce lookup friction, not to replace trying on a garment.
Retail reference, not a fitting diagnosis
Bra sizing varies by brand, cup shape, fabric, wire, and personal comfort. Do not use this page for medical concerns, breast-health decisions, posture advice, or a guaranteed brand-specific fit; confirm with the retailer or a professional fitter when fit matters.
FAQ
Common questions and answers about this topic.
Will weight changes affect bra size?
Weight changes usually move the underbust and bust together, so the difference (and therefore the cup letter) can shift. After a noticeable change of around 3 kg or more, re-measure both numbers and compare against the table again.
Should I pick the same size for wired and wireless bras?
The numerical band and cup are usually the same, but wireless designs rely more on band tension. Some brands suggest going one band tighter for the wireless version; let actual try-on stability decide.
How do I pick the right bra size when shopping online?
Re-measure your underbust and bust first, then convert the seller's regional label using this table. Keep a sister size as backup, and prefer sellers that publish actual garment measurements and accept exchanges.
Does this chart apply to sports bras and swimwear?
The underbust and cup logic is the same, but sports bras often use S/M/L tags and swimwear sometimes uses one-piece sizing. Treat this table as a baseline reference and always cross-check the brand's own size chart.
What is Bra Size Conversion Table?
Compare bra band sizes and cup measurements across Taiwan, US/UK, Europe, and Japan with optional filters.
Is Bra Size Conversion Table free to use?
Yes, Bra Size Conversion Table is completely free to use.
Data Sources
This tool's data is compiled from the authoritative sources below.
Data last maintained