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How Ireland Sizing Actually Works
Irish band sizes are measured in inches with the UK-style extended cup ladder, identical in structure to what’s sold across the UK.
Because so many UK retailers ship directly to Ireland or operate stores there, sizing stays consistent without much need for conversion between the two markets.
Convert Your Size
Use the calculator above to see your size across all 7 systems this site supports, Ireland included. If you already know your size in another system, enter it into the Global Bra Size Converter instead of doing the math by hand.
Getting an Accurate Starting Point
Getting this right starts with the measurement, not the conversion table. See How to Measure for the technique this tool relies on, then check the Sister Size Calculator if the first size feels slightly off.
A Worked Example for Ireland
Say your underbust measures 28 inches and your bust measures 32 inches. A US 28DD.
Converted to Ireland’s system, that becomes roughly 28″ DD using the formula above. Run your own numbers through the calculator on this page rather than eyeballing the conversion. Small rounding differences near a size boundary can shift the result by a full cup letter.
Shopping Locally vs. Importing in Ireland
Irish retailers generally follow UK sizing closely enough that a converted UK size can be used directly, though a small number of imported EU brands will need the separate EU conversion instead.
Common Sizing Mistakes Shoppers Make in Ireland
Irish shoppers sometimes assume every brand sold locally uses UK sizing, when a growing number of EU-imported labels use the separate centimeter-based system instead.
Shoppers also sometimes default to whichever system a UK-based online retailer displays first, without checking whether the specific brand being bought is actually manufactured to the EU chart instead.
A Note on Retail Fitting in Ireland
Irish retailers generally maintain UK-standard fitting services, with most larger stores offering free consultations on request.
Ireland Within the UK-Adjacent System
Ireland’s sizing convention closely follows the UK’s, which makes sense given the shared retail history between the two markets. A size that works at a UK retailer is a reliable starting point for Irish shoppers too.
Strong UK Retail Overlap
Ireland’s retail market has close historical and practical ties to the UK, with many of the same brands and retailers operating across both markets. UK sizing guidance generally applies directly here.
EU Membership Adds a Second Layer of Availability
As an EU member, Ireland also has access to continental European brands using the EU cm-based convention alongside UK-style brands, giving shoppers a genuinely wider mix of sizing systems to sort through than a purely UK-aligned market would.
Dublin Serves as the Primary Retail Hub
Extended and specialty size availability tends to concentrate in Dublin and other larger urban centers, with online ordering bridging the gap for shoppers in smaller towns and rural areas.
