AU to NZ Ring Size Conversion – Australian to New Zealand Ring Size Chart

AU to NZ Ring Size Conversion

Australian and New Zealand ring sizes use the same alphabetical system — complete conversion chart with US, EU, Japan sizes, diameter in mm, and circumference

🇦🇺 Australian Sizes 🇳🇿 New Zealand Sizes 📏 Sizes A – Z+3 🔄 US · EU · Japan 📐 mm Measurements 🏠 Measure at Home

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Same

AU & NZ use
identical sizes

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Total Sizes
A to Z+3

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Most Common
Women's Size

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Most Common
Men's Size

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Key Conversion Fact

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Australian and New Zealand Ring Sizes Are Identical

Both Australia and New Zealand use the UK alphabetical ring sizing system (A to Z+3). This means an Australian size N is exactly the same as a New Zealand size N — no conversion is needed between AU and NZ. You only need to convert when shopping from the US, EU, or Japan.

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Australia (AU)

Uses the UK Wheatsheaf alphabetical system — sizes run from A (smallest) through Z+3 (largest). Half sizes are available in some ranges (e.g. N½).

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New Zealand (NZ)

Also uses the UK Wheatsheaf alphabetical system — identical to Australian sizing. Sizes run from A through Z+3. NZ jewellers and AU jewellers use the same size chart.

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AU / NZ Ring Size Lookup

Enter your finger measurement to find your AU / NZ ring size instantly

Your AU / NZ Ring Size

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Complete AU / NZ Ring Size Conversion Chart

🇦🇺🇳🇿 AU / NZ Size	Diameter (mm)	Circumference (mm)	🇺🇸 US Size	🇪🇺 EU / ISO Size	🇯🇵 Japan Size	Typical Wearer
A	12.0 mm	37.8 mm	—	38	1	Child
B	12.4 mm	39.1 mm	1	39	2	Child
C	12.9 mm	40.4 mm	1½	40.5	3	Child
D	13.3 mm	41.7 mm	2	41.5	4	Child
E	13.7 mm	43.0 mm	2½	43	5	Child
F	14.1 mm	44.2 mm	3	44	6	Child/Small
G	14.3 mm	45.0 mm	3½	45	7	Small Women
H	14.7 mm	46.1 mm	3¾	46	8	Small Women
I	15.1 mm	47.4 mm	4¼	47.5	9	Women
J	15.5 mm	48.7 mm	4¾	49	10	Women
K	15.9 mm	49.9 mm	5¼	50	11	Women
L	16.3 mm	51.2 mm	5¾	51	12	Popular ♀
M	16.7 mm	52.5 mm	6¼	52.5	13	Popular ♀
N ⭐	17.1 mm	53.8 mm	6¾	54	14	Most Common ♀
O	17.5 mm	55.0 mm	7¼	55	15	Popular ♀
P	17.9 mm	56.3 mm	7¾	56	16	Women / Men
Q	18.3 mm	57.6 mm	8¼	57.5	17	Women / Men
R	18.7 mm	58.9 mm	8¾	59	18	Men
S	19.2 mm	60.1 mm	9¼	60	19	Men
T ⭐	19.6 mm	61.4 mm	9¾	62	21	Most Common ♂
U	20.0 mm	62.7 mm	10¼	63	22	Popular ♂
V	20.4 mm	64.0 mm	10¾	64	23	Men
W	20.8 mm	65.2 mm	11¼	65	24	Men
X	21.2 mm	66.5 mm	11¾	66.5	26	Large Men
Y	21.6 mm	67.8 mm	12¼	68	27	Large Men
Z	22.0 mm	69.1 mm	12¾	69	29	Large Men
Z+1	22.4 mm	70.3 mm	13	70	30	XL
Z+2	22.8 mm	71.6 mm	13½	71.5	31	XL
Z+3	23.2 mm	72.9 mm	14¼	73.5	33	XL

⭐ Size N = Most common women's size in AU & NZ

⭐ Size T = Most common men's size in AU & NZ

🟡 Highlighted rows = most popular sizes

🇦🇺🇳🇿 AU size = NZ size (always identical)

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How to Measure Your Ring Size at Home

Method 1 — Paper Strip (Most Accurate)

Cut a thin strip of paper

Approximately 1 cm wide and 10 cm long. A piece of non-elastic string or thread works equally well.

Wrap around your finger base

Wrap snugly around the base of the finger you want to size. Ensure it passes comfortably over your knuckle.

Mark the overlap

Use a pen to mark exactly where the strip meets itself — this measurement is your finger circumference.

Measure in millimetres

Lay the strip flat against a ruler and record the length in mm. Then enter it into the calculator above.

Match to the chart above

Find the closest value in the Circumference (mm) column to identify your AU / NZ ring size.

Method 2 — Existing Ring Diameter

Select a well-fitting ring

Choose a ring that fits comfortably on the finger you want to size — not too tight, not too loose.

Measure the inner diameter

Place the ring on a ruler and measure straight across the inside opening in millimetres.

Match to the Diameter column

Find the measurement in the Diameter (mm) column of the chart above to get your AU / NZ size.

📐 Measurement Formulas

Diameter → Circumference

Circumference (mm) = Diameter (mm) × 3.14159

Example: 17.1 mm × 3.14159 = 53.7 mm → AU / NZ Size N

Inches → Millimetres

mm = inches × 25.4

Example: 0.674″ × 25.4 = 17.1 mm → AU / NZ Size N

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Ring Sizing Tips for AU & NZ

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Measure at normal temperature. Fingers shrink in cold weather and swell in heat. Measure when you're at a comfortable room temperature for the most accurate result.
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Measure at the end of the day. Fingers are naturally slightly larger in the evening. This gives you a comfortable fit throughout the day.
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Measure 3 times and take the average. Ring sizing can vary slightly between measurements — always take 2–3 readings and use the average for best accuracy.
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Round up if between two sizes. If your circumference falls between two AU / NZ letter sizes, always go up to the larger size for a comfortable fit.
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Consider the ring width. Wider bands (over 6mm) tend to fit tighter. If ordering a wide band, go up half a size from your measured AU / NZ size.
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Buying across the Tasman? Because AU and NZ use the same size system, you can order freely from both Australian and New Zealand jewellers using the same letter size — no conversion needed.
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Ordering from the US? US sizes use a numerical system. Use the chart above to convert your AU / NZ letter size to the equivalent US number before ordering.

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Frequently Asked Questions

Are Australian and New Zealand ring sizes the same? ▾

Yes — Australia and New Zealand both use the UK alphabetical (Wheatsheaf) ring sizing system, which runs from size A through Z+3. An AU size M is exactly the same as an NZ size M. There is no conversion needed when buying between the two countries.

What is the most common women's ring size in Australia and New Zealand? ▾

The most common women's ring size in both Australia and New Zealand is size N, which corresponds to a finger circumference of approximately 53.8 mm and a diameter of 17.1 mm. Sizes L through P are considered the popular women's range.

What is the most common men's ring size in Australia and New Zealand? ▾

The most common men's ring size in both AU and NZ is size T, which has a diameter of 19.6 mm and circumference of 61.4 mm. Men's sizes generally range from R to W, with T and U being the most frequently purchased.

How do I convert my AU / NZ ring size to US size? ▾

Use the conversion chart above to find your AU / NZ letter size and read across to the US column. For example, AU / NZ size N = US size 6¾, and AU / NZ size T = US size 9¾. US sizes use a numerical scale rather than letters.

How do I convert AU / NZ size to European (EU) size? ▾

EU (ISO) sizes correspond to the internal circumference of the ring in millimetres. For example, AU / NZ size N (circumference 53.8 mm) is EU size 54. Simply look up the EU column in the chart above to find your EU equivalent.

What if my finger size falls between two AU / NZ sizes? ▾

Always round up to the next larger size. For example, if your circumference measures 54.5 mm (between size N at 53.8 mm and size O at 55.0 mm), choose size O for a comfortable fit. A ring that is slightly loose is safer and easier to resize than one that is too tight.

Can I use an online ring sizer for AU and NZ sizes? ▾

Yes, but ensure the sizer explicitly uses the AU/NZ/UK alphabetical sizing system. Most online tools in Australia and New Zealand default to the correct system. Alternatively, measure your finger circumference with a strip of paper and use the calculator above to find your size instantly.

Do half sizes exist in Australian / NZ ring sizing? ▾

Yes — half sizes exist in the alphabetical system (e.g. N½, P½) and some jewellers use them, especially in the popular women's range. However, many retailers only stock full letter sizes. If your measurement falls between sizes, the half size option may offer a more precise fit when available.