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

EU to AU Ring Size Conversion

Convert European ring sizes to Australian ring sizes instantly — complete EU to AU chart with diameter mm, circumference, US, UK and Japan sizes plus reverse AU to EU lookup

🇪🇺 EU Sizes 44 – 72 🇦🇺 AU Letter Sizes F – Z+3 📐 Based on Inner Circumference (mm) 🔄 Instant Calculator 🇺🇸 US · 🇯🇵 Japan Included

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EU Size for
AU Women's Avg (N)

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61.5

EU Size for
AU Men's Avg (T)

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= mm

EU Size equals
Inner Circ. in mm

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44–72

Full EU
Size Range

The EU (European / ISO) ring sizing system is based directly on the inner circumference of the ring in millimetres. EU size 54 means the ring's inner circumference is 54 mm. Australia uses a letter-based system (F through Z+3) that matches the UK standard. Converting between the two is straightforward — simply match the EU number to the circumference (mm) column in the chart below.

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EU ↔ AU Ring Size Calculator

Select conversion direction and enter your size for an instant result

Converted Size

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Complete EU to AU Ring Size Chart

🇪🇺 EU / ISO Size	🇦🇺 AU / UK Size	🇺🇸 US / Canada	🇯🇵 Japan	Diameter (mm)	Circumference (mm)	Typical Wearer
44	F	3	4	14.1 mm	44.3 mm	Child
45	G	3.5	6	14.5 mm	45.6 mm	Child
46	G½	3.75	—	14.7 mm	46.2 mm	Child
47	H	4	7	14.9 mm	46.8 mm	Child
48	I	4.5	8	15.3 mm	48.1 mm	Small Women
48.7	J	4.75	—	15.5 mm	48.7 mm	Small Women
50	K	5.25	10	15.9 mm	50.0 mm	Women
51	L	5.75	11	16.3 mm	51.2 mm	Women
52	M	6.25	12	16.7 mm	52.5 mm	Popular ♀
53	N½	6.5	—	16.9 mm	53.0 mm	Popular ♀
54 ⭐	N	6.75	13	17.1 mm	53.8 mm	Most Common ♀
55	O	7.25	14	17.5 mm	55.0 mm	Popular ♀
56	P	7.75	15	17.9 mm	56.2 mm	Women / Men
57	P½	8	—	18.1 mm	57.0 mm	Women / Men
57.5	Q	8.25	16	18.3 mm	57.5 mm	Women / Men
58	Q½	8.5	17	18.5 mm	58.1 mm	Men
59	R	8.75	18	18.8 mm	59.1 mm	Men
60	S	9.25	19	19.2 mm	60.2 mm	Men
61	S½	9.5	—	19.4 mm	61.0 mm	Men
61.5 ⭐	T	9.75	20	19.6 mm	61.6 mm	Most Common ♂
62	U	10.25	21	20.0 mm	62.8 mm	Popular ♂
63	U½	10.5	22	20.2 mm	63.5 mm	Popular ♂
64	V	10.75	23	20.4 mm	64.0 mm	Men
65	W	11.25	24	20.8 mm	65.3 mm	Large Men
66	W½	11.5	—	21.0 mm	66.0 mm	Large Men
67	X	11.75	—	21.2 mm	66.6 mm	Large Men
68	Y	12.25	26	21.6 mm	67.9 mm	XL
68.5	Z	12.5	—	21.8 mm	68.5 mm	XL
70	Z+1	13	27	22.3 mm	70.0 mm	XL
71	Z+2	13.5	28	22.6 mm	71.0 mm	XL
72	Z+3	14	29	22.9 mm	71.9 mm	XL

⭐ EU 54 = AU N — most common women's size

⭐ EU 61.5 = AU T — most common men's size

📐 EU size = inner circumference in mm

🔼 When between sizes, always size up

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Quick Reference — Most Common Sizes

🇪🇺 EU Size	🇦🇺 AU Size	🇺🇸 US Size	Diameter (mm)	Who Wears This
50	K	5.25	15.9 mm	Petite women
51	L	5.75	16.3 mm	Small women's size
52	M	6.25	16.7 mm	Popular women's size
54 ⭐	N	6.75	17.1 mm	Most common AU women's
55	O	7.25	17.5 mm	Popular women's size
56	P	7.75	17.9 mm	Larger women / unisex
57.5	Q	8.25	18.3 mm	Small men / unisex
59	R	8.75	18.8 mm	Average smaller men
60	S	9.25	19.2 mm	Popular men's size
61.5 ⭐	T	9.75	19.6 mm	Most common AU men's
62	U	10.25	20.0 mm	Popular men's size
64	V	10.75	20.4 mm	Larger men's size

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How the EU Ring Sizing System Works

EU / ISO Size = Inner Circumference in mm

EU size is the circumference directly

Unlike Australian letters or US fractions, the European ISO sizing system uses the ring's inner circumference in millimetres as the size number. EU size 54 means the inner circumference of the ring is exactly 54 mm.

Find your AU equivalent

Measure your finger circumference in mm using a strip of paper or thread, then match that number directly to the EU column above. The corresponding AU letter in the same row is your Australian size.

Verify with diameter

Cross-check by dividing your EU size by 3.14159 to get the inner diameter in mm. Confirm this matches the Diameter (mm) column in the chart for added accuracy before purchasing.

📐 EU Conversion Formulas

EU Size → Diameter (mm)

Diameter = EU Size ÷ π (3.14159)

Example: EU 54 ÷ 3.14159 = 17.2 mm → AU Size N

Diameter (mm) → EU Size

EU Size = Diameter (mm) × π (3.14159)

Example: 19.6 mm × 3.14159 = 61.6 → EU 61.5 → AU Size T

EU Size = Inner Circumference

EU 54 = 54 mm inner circumference = AU N = US 6.75

This makes EU sizing the simplest to use — your finger circumference measurement in mm IS the EU size.

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Ring Size Systems Compared

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EU / ISO (European)

Inner circumference in mm. EU 54 = 54 mm. Used across France, Germany, Spain, Italy, Netherlands, Scandinavia. The most logical system — your measurement IS the size.

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Australian / UK

Letter scale: F, G, H … Z, Z+1, Z+2, Z+3. Identical to the UK and Irish system. Most common sizing format in Australian jewellery stores.

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US / Canada

Fractional numeric: 3, 3½, 4 … 14. Common on international e-commerce platforms like Amazon, Etsy, and Blue Nile. Often listed alongside EU sizes.

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Japan

Whole number scale: 1–30. Used across Japan and some East Asian markets. Japan skips size 7 traditionally, so there is a gap in the sequence.

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Diameter (mm)

Universal reference — inner diameter in millimetres. Accepted by every jeweller worldwide and the safest way to verify size when converting between systems.

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Swiss / German

Numeric based on inner diameter in mm (e.g. Swiss 17 = 17 mm diameter). Slightly different to EU circumference numbers — always cross-check with diameter column.

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Tips for Converting EU to AU Ring Sizes

📐 Your EU size IS your circumference in mm — if you have measured your finger and got 54 mm, your EU size is 54, which equals AU size N. This is the simplest conversion of any system — no formula needed for the first step.
🔍 Always verify with inner diameter — divide your EU size by 3.14159 to get the diameter. Cross-reference the diameter column in the chart above to confirm your AU size before purchasing, especially for expensive rings.
🏪 European brand sizing may vary slightly — luxury European brands such as Pandora, Swarovski, Cartier, and Tiffany may use their own proprietary size increments. Always check their individual size guide rather than relying solely on a general EU conversion chart.
🔼 Always round up when between sizes — EU sizes come in whole and half numbers (e.g. 54, 54.5, 55). If your circumference falls between two values, choose the larger EU size and its AU equivalent. A ring that is slightly loose is always easier to resize than one that is too tight.
📏 Wide EU bands need a larger AU size — EU rings wider than 6 mm will feel tighter than the size suggests. If ordering a wide European band, go half a size up in both EU and AU terms. A 6 mm Pandora-style band at EU 54 would fit more like EU 52–53 due to the extra surface pressure.
☀️ Measure at room temperature in the afternoon — fingers swell in warmth and shrink in cold. Australian summers can cause fingers to be half a size larger than in winter. Measure when your hands are at typical everyday temperature for the most reliable long-term fit.

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Frequently Asked Questions

What is EU ring size 54 in Australian size? ▾

EU ring size 54 is equivalent to Australian size N. EU 54 means an inner circumference of 54 mm, which corresponds to an inner diameter of approximately 17.1 mm. AU N is the most common women's ring size in Australia and equals US size 6.75.

What is EU ring size 60 in Australian size? ▾

EU ring size 60 is equivalent to Australian size S. This corresponds to a circumference of 60.2 mm and an inner diameter of approximately 19.2 mm. AU S is a popular men's size and equals US 9.25.

What does EU ring size mean? ▾

The EU (European / ISO) ring size is simply the inner circumference of the ring in millimetres. EU size 54 means the inner circumference is exactly 54 mm. This makes EU sizing uniquely simple — if you measure your finger circumference in mm, that measurement IS your EU size. No conversion formula is needed for the first step.

What is EU size 52 in Australian ring size? ▾

EU ring size 52 is equivalent to Australian size M (inner diameter 16.7 mm, circumference 52.5 mm, US 6.25). AU M is a popular women's ring size just below the most common average of AU N.

How do I convert an AU ring size to EU? ▾

Use the calculator above and select "Australian → EU." Alternatively, find your AU letter in the chart and read across to the EU column. Common conversions: AU N = EU 54, AU T = EU 61.5, AU P = EU 56. You can also multiply the diameter in mm by 3.14159 to get the EU size directly.

Is EU size 56 the same as AU P? ▾

Yes. EU size 56 is equivalent to Australian size P, which has an inner circumference of 56.2 mm and an inner diameter of 17.9 mm. AU P equals US size 7.75 and Japan size 15. It sits at the unisex range — popular for larger women's sizes and smaller men's sizes.

What Pandora size is AU N? ▾

Pandora uses European ring sizing. AU size N corresponds to approximately Pandora size 54 (EU 54), which is Pandora's most popular size for women. Pandora rings are available in sizes 44, 46, 48, 50, 52, 54, 56, 58, 60, and 62. Always check Pandora's own size guide as their rings are fixed-width and cannot be resized.

Are EU and ISO ring sizes the same? ▾

Yes — EU and ISO ring sizes are the same standard. The ISO 8653 standard defines ring sizes based on inner circumference in millimetres, which is exactly what the European size system uses. You will see this system labelled as "EU", "European", "ISO", or simply listed as a number representing millimetres on jewellery from France, Germany, Spain, Italy, and other European countries.