AU to EU Ring Size Conversion – Australian to European Ring Size Chart

AU to EU Ring Size Conversion

Convert Australian ring sizes (A – Z+3) to European (EU) sizes instantly — with diameter in mm, circumference, and US equivalents included

🇦🇺 Australian Sizes A – Z+3 🇪🇺 European (EU) Sizes 📐 mm Measurements 🇺🇸 US Sizes Included 🔄 Instant Converter

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Avg Women's
AU Size

🇪🇺

47.5

EU Women's
Equivalent

📊

Sizes in
This Chart

📐

EU = Inner
Circumference

🔄

AU ↔ EU Ring Size Converter

Select your Australian ring size to instantly find the European (EU) equivalent

European (EU) Ring Size

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Complete AU to EU Conversion Chart

🇦🇺 AU / UK Size	🇪🇺 EU Size	Diameter (mm)	Circumference (mm)	🇺🇸 US Size	Typical Wearer
A	37.8	12.0 mm	37.8 mm	0.5	Child
B	38.5	12.3 mm	38.5 mm	1	Child
C	39.3	12.5 mm	39.3 mm	1.5	Child
D	40.0	12.8 mm	40.0 mm	2	Child
E	40.8	13.0 mm	40.8 mm	2.5	Child
F	41.5	13.2 mm	41.5 mm	3	Child
G	42.3	13.5 mm	42.3 mm	3.5	Small Women
H	43.0	13.7 mm	43.0 mm	4	Small Women
I	43.8	13.9 mm	43.8 mm	4.25	Women
J	44.5	14.2 mm	44.5 mm	4.75	Women
K	45.3	14.4 mm	45.3 mm	5.25	Women
L	46.0	14.6 mm	46.0 mm	5.5	Women
M	46.8	14.9 mm	46.8 mm	6	Popular ♀
N ⭐	47.5	15.1 mm	47.5 mm	6.5	Most Common ♀
O	48.3	15.3 mm	48.3 mm	7	Popular ♀
P	49.0	15.6 mm	49.0 mm	7.5	Women / Men
Q	49.8	15.8 mm	49.8 mm	8	Women / Men
R	50.5	16.1 mm	50.5 mm	8.5	Men
S	51.3	16.3 mm	51.3 mm	9	Men
T ⭐	52.0	16.6 mm	52.0 mm	9.5	Most Common ♂
U	52.8	16.8 mm	52.8 mm	10	Popular ♂
V	53.5	17.0 mm	53.5 mm	10.5	Men
W	54.3	17.3 mm	54.3 mm	11	Men
X	55.0	17.5 mm	55.0 mm	11.5	Large Men
Y	55.8	17.8 mm	55.8 mm	12	Large Men
Z	56.5	18.0 mm	56.5 mm	12.5	Large Men
Z+1	57.3	18.2 mm	57.3 mm	13	XL
Z+2	58.0	18.5 mm	58.0 mm	13.5	XL
Z+3	58.8	18.7 mm	58.8 mm	14	XL

⭐ AU N = EU 47.5 — Most common women's size

⭐ AU T = EU 52.0 — Most common men's size

📐 EU size = inner circumference in mm

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How European Ring Sizing Works

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Australian (AU) Sizing

Uses letters: A, B, C … Z, Z+1, Z+2, Z+3
Same system as UK sizing
Sizes increase by approx. 0.8 mm circumference each step
Widely used in Australia, New Zealand, UK, Ireland, South Africa
Easy to remember — alphabetical order

🇪🇺

European (EU) Sizing

Uses numbers based on inner circumference in mm
EU 47 = 47 mm inner circumference
Used across France, Germany, Spain, Italy, Netherlands
Also called "ISO" or "French" sizing in some countries
Most precise system — directly tied to physical measurement

📐 The Conversion Formula

AU/UK Letter → EU Number

EU Size = Inner Circumference (mm)

Example: AU size N → inner circumference = 47.5 mm → EU size 47.5

EU Number → Diameter (mm)

Diameter (mm) = EU Size ÷ π (3.14159)

Example: EU 47.5 ÷ 3.14159 = 15.1 mm diameter → AU size N

💡

Conversion Tips & Best Practices

🎯EU size = circumference in mm: The EU number directly represents the inner circumference of the ring in millimetres — making it the most accurate system to convert from.
📏Always round up when between sizes: If your measurement falls between two EU sizes (e.g. 47.1 mm), go up to the next size (EU 47.5 / AU N) for a comfortable fit.
🌡️Measure at the right time of day: Fingers are slightly larger in the afternoon and in warm weather. Measure mid-afternoon for the most accurate result.
💍Wide band rings need a larger size: If the EU ring you're buying has a band wider than 4 mm, go up 0.5–1 EU size for comfort.
🛍️Buying from European brands? Major European jewellers (Pandora, Thomas Sabo, Ti Sento) use EU sizing. Use this chart to convert your AU size before ordering.
🔄AU and UK are the same: Australian sizing is identical to UK sizing — so a UK conversion chart works equally well for Australian sizes.

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Frequently Asked Questions

What is AU size N in EU? ▼

AU size N is equivalent to EU size 47.5. This corresponds to an inner circumference of 47.5 mm and a diameter of approximately 15.1 mm. It is the most common women's ring size in Australia.

What is AU size T in EU? ▼

AU size T is equivalent to EU size 52.0. This corresponds to an inner circumference of 52.0 mm and a diameter of approximately 16.6 mm. It is the most common men's ring size in Australia.

Is Australian ring sizing the same as UK? ▼

Yes — Australian ring sizing is identical to UK ring sizing. Both use the same alphabetical letter system (A through Z+3). If you find a UK-to-EU conversion chart, it applies perfectly to Australian sizes as well.

How do I convert EU size to AU size? ▼

The EU size number equals the inner circumference of the ring in mm. Find that circumference value in the chart above to get your AU/UK letter size. For example, EU 49.0 = AU size P (circumference 49.0 mm).

Do Pandora rings use EU sizing? ▼

Yes — Pandora uses EU sizing (S, M, L which roughly correspond to EU 52, 54, 56). Use this chart to find your AU size equivalent before purchasing Pandora or other European jewellery brands online.

What is the difference between EU and US ring sizes? ▼

EU sizes are based on circumference in mm (e.g. EU 47.5), while US sizes use an arbitrary numerical scale (e.g. US 6.5). For reference, EU 47.5 = US 6.5 = AU N. Both columns are included in the chart above for easy cross-referencing.

My ring is EU 51 — what is that in AU? ▼

EU 51 falls between AU size R (EU 50.5) and AU size S (EU 51.3). Since EU 51 is closer to 51.3, AU size S is the best match. When between sizes, always size up for comfort.