Convertisseur international de taille de soutien-gorge

The Bra Size International Converter translates band and cup sizes across six major sizing systems: US (28-46 band, AA-J cup), UK (28-46 band, AA-H cup with FF/GG/HH double-letter scheme), EU (60-105 band, AA-K cup), French (75-120 band, similar cup to EU but band numbering offset), Australian (6-24 band, AA-K cup), and Japanese (60-105 band, similar to EU). Despite same letter-and-number format appearing in multiple systems, each measures and labels differently — a US 34B is NOT a UK 34B in actual fit, and EU bands don't even use the same base numbers (60 cm vs 28 inches). Bra sizing standards developed independently in different regions during the early 20th century. US sizing emerged from Maidenform and Warner's in the 1930s. UK developed its own cup naming convention preserving traditional letter sequence (DD, DDD then E, F). EU/French uses metric measurements directly (band in cm). Modern Australian uses small integers (6-24) to band sizes. The international bra industry's persistent inability to standardize globally is partly cultural and partly serves marketing — each region's labels become familiar to consumers and create perceived value through brand association. Finding the right size has practical importance because bras affect comfort, support, posture, and clothing fit dramatically. Wacoal and other fitting studies have found 70-80% of women wear the wrong bra size — typically too-large band and too-small cup. Common pattern: someone measuring as 32D actually wears 36B which fits poorly (band too loose so cup pulls upward). Professional fitting is the gold standard, but international shoppers need conversion knowledge for online purchases from UK retailers (Bravissimo, Curvy Kate), US retailers (Victoria's Secret, ThirdLove), French (Chantelle, Simone Pérèle), and others. This calculator helps you convert between major systems for accurate international bra shopping. Enter band size and select system. Enter cup letter and select cup system. Calculator outputs equivalent band+cup sizes across US, UK, EU, French, Australian, and Japanese systems. Key conversion: US uses DD, DDD, E sequence; UK uses DD, E, F, FF, G, GG sequence; EU/French/Japanese use simple A-K sequence without double letters. Knowing these alphabetical differences is critical for international shopping accuracy.

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1. 1Step 1 — Enter Your Known Band Size: Enter the numerical part of your current bra size (28, 30, 32, 34, etc. for US/UK; 60, 65, 70, 75 for EU/JP; 6-24 for Australian). Select which system this is from.
2. 2Step 2 — Enter Your Cup Letter: Enter cup letter from your known size. Note: how cup letters extend differs across systems. US D, DD, DDD, F, G... UK D, DD, E, F, FF... EU D, E, F, G... — significant differences after D cup.
3. 3Step 3 — Calculator Finds Closest Band Match: Calculator uses standard reference tables to match your band number to international equivalents. Each band row contains US, UK, EU, French, Australian, Japanese numbers for same underbust measurement.
4. 4Step 4 — Calculator Maps Cup Across Systems: Uses standardized cup letter mapping. Critical insight: US DD = UK DD = EU E. US DDD = UK E = EU F. The pattern becomes clear with reference table familiarity.
5. 5Step 5 — Review Combined Band+Cup in All Systems: Output displays your size in all 6 major international systems (US, UK, EU, French, Australian, Japanese) combined band+cup format. Use whichever system matches retailer you're shopping.
6. 6Step 6 — Apply Sister Size Knowledge for Better Fit: If converted size doesn't fit, try sister sizes — same cup volume at different band. Sister sizes: 34C = 32D = 36B. Going down a band and up a cup is the most common adjustment when band feels loose.

• !Assuming same number = same band size — US 34 = UK 34 yes, but EU 34 doesn't exist (band starts at 60 cm).
• !Confusing cup conversion across systems — US DD = UK DD = EU E (single letter); US DDD = UK E = EU F.
• !Not getting professionally measured — Wacoal studies show 80% of women wear wrong bra size; self-measurement often inaccurate.
• !Buying based on number alone — fit is the band+cup combination; same number with different letter is dramatically different.
• !Trusting vanity sizing in US fast-fashion brands — true size may be very different from labeled size in these brands.