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Australian Bra Size Calculator
Find your Australian and New Zealand bra size (Dress sizes 6–26) with sister sizes and Berlei/Bonds conversion.
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About Australian Bra Size Calculator
Accurate Australian bra size calculator using official AU/NZ dress size bands (6 to 26) and 2cm cup progressions (A to J). Features sister sizes, fit adjustments for Berlei, Bonds, and Bras N Things, plus international US/UK/EU conversions.
How does Australian and New Zealand bra sizing work?
Unlike the United States and United Kingdom which label bra bands by ribcage inches (e.g. 32, 34, 36), Australia and New Zealand utilize standard women's ready-to-wear dress sizes (Size 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26). A dress size 10 band fits an underbust circumference of 70–74 cm (US/UK 32), while an Australian dress size 12 band fits 75–79 cm (US/UK 34).
Australian Dress Size Band Conversion Table (AU vs US, UK & EU)
↔ Swipe table horizontally to see international band equivalencies
| AU/NZ Dress Band | Snug Underbust (cm) | Snug Underbust (inches) | US & UK Band | European (EU) Band | French (FR) Band |
|---|---|---|---|---|---|
| Size 6 | 58 – 62 cm | 23 – 24.5 in | 28 Band | 60 Band | 75 Band |
| Size 8 | 63 – 67 cm | 25 – 26.5 in | 30 Band | 65 Band | 80 Band |
| Size 10 | 68 – 72 cm | 27 – 28.5 in | 32 Band | 70 Band | 85 Band |
| Size 12 | 73 – 77 cm | 29 – 30.5 in | 34 Band | 75 Band | 90 Band |
| Size 14 | 78 – 82 cm | 31 – 32.5 in | 36 Band | 80 Band | 95 Band |
| Size 16 | 83 – 87 cm | 33 – 34.5 in | 38 Band | 85 Band | 100 Band |
| Size 18 | 88 – 92 cm | 35 – 36.5 in | 40 Band | 90 Band | 105 Band |
| Size 20 | 93 – 97 cm | 37 – 38.5 in | 42 Band | 95 Band | 110 Band |
| Size 22 | 98 – 102 cm | 39 – 40.5 in | 44 Band | 100 Band | 115 Band |
| Size 24 | 103 – 107 cm | 41 – 42.5 in | 46 Band | 105 Band | 120 Band |
| Size 26 | 108 – 112 cm | 43 – 44.5 in | 48 Band | 110 Band | 125 Band |
Australian Cup Progression & Bust Difference Formula
Australian bra cups progress strictly in 2 cm increments of difference between your fullest bust measurement and your firm underbust measurement:
Bust - Underbust Difference: 10 cm = AA Cup 18 cm = D Cup 26 cm = G Cup 12 cm = A Cup 20 cm = DD Cup 28 cm = H Cup 14 cm = B Cup 22 cm = E Cup 30 cm = J Cup 16 cm = C Cup 24 cm = F Cup 32 cm = K Cup
How do Australian sister sizes work?
Sister sizes contain the exact same cup volume with a firmer or looser dress-size band. To sister size in Australia, adjust the dress size by 2 digits and shift the cup by one letter in the opposite direction. For example, if a 12DD feels slightly loose in the band, your firmer sister size is 10E (holding the exact same breast volume). If a 12DD feels uncomfortably tight around the ribs, your looser sister size is 14D.
📐 Methodology & Reference Accuracy:
Calculations, formulas, and conversions execute locally in your web browser. Output models are benchmarked against official reference standards and updated for 2026.
🔒 This tool runs entirely in your browser. Nothing is uploaded or stored.
Background reading: Australian Bra Size Calculator on Wikipedia. More: all calculators.
Frequently Asked Questions about Australian Bra Size Calculator
What is an Australian size 12D in US and UK sizing?
An Australian 12D is equivalent to a US 34D and a UK 34D. In European metric sizing, it is a 75D, and in French sizing, it is a 90D.
What is a 14DD equivalent to?
An Australian 14DD is equivalent to a US 36DD (or 36E), a UK 36DD, and a European 80E.
Why are Berlei sports bra bands firmer?
Berlei sports bras (such as the Shift and Electrify series) utilize high-tensile power-mesh and rigid fabric to restrict breast movement by up to 60%. When buying a Berlei sports bra, many women prefer sister-sizing up one dress size (e.g. 12DD to 14D) for comfortable deep lung breathing during cardio exercise.
How do Bonds bras and bralettes fit compared to underwires?
Bonds bralettes and wireless tees run true to Australian dress sizes (e.g. Small fits 8–10, Medium fits 12–14). For larger cup sizes (DD+), Bonds Full Bust or Berlei wirefree ranges offer reinforced side slings that prevent flattening.
Is New Zealand bra sizing the same as Australia?
Yes. Australia and New Zealand share identical retail sizing standards (Sizes 6–26, cups A–J) across major shared brands including Bendon, Pleasure State, Fayreform, Me.By.Bendon, and Bras N Things.
What is the difference between an Australian D and DD cup?
In Australian sizing, a D cup represents an 18 cm difference between bust and underbust, while a DD cup represents a 20 cm difference. A DD cup holds approximately 150cc to 200cc more breast tissue volume than a D cup on the same band.
How can I tell if my Australian bra band is too big?
If your bra band rides up toward your shoulder blades in the back, or if breast tissue slips out underneath the underwire when you raise your arms, your dress band is too large. Step down one dress size (e.g. from 14D to 12DD).
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