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

NZ to AU Ring Size Conversion

New Zealand and Australia use the exact same ring size system — both use AU/NZ letter codes. Full chart with US, EU, Japan, mm circumference and diameter, plus a free NZ/AU size calculator

🇳🇿 NZ = 🇦🇺 AU — Same System 🔤 Letter Sizes A – Z+4 🇺🇸 US / 🇪🇺 EU / 🇯🇵 Japan 📏 mm Circumference & Diameter 🧮 Free Size Calculator

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NZ = AU

Identical Ring
Size Systems

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A–Z+4

NZ / AU
Size Range

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N–O

Avg Women's
NZ / AU Size

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T–U

Avg Men's
NZ / AU Size

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The Key Fact You Need to Know

🇳🇿 = 🇦🇺

NZ and AU Ring Sizes Are Identical — No Conversion Needed

New Zealand and Australia use the exact same ring size system — the AU/NZ letter system. A ring labelled NZ size N is the same as AU size N. Both systems use alphabet letters (A through Z+4) based on inner finger circumference in millimetres. If you have a NZ ring size, that is already your AU size — you can shop directly in Australia without any conversion.

✅ NZ size = AU size — same letter, same fit

🇳🇿

New Zealand Ring Sizing

System: AU/NZ Letter System
Range: A – Z+4 (incl. half-sizes)
Based on: Inner circumference (mm)
Used in: NZ, Australia, UK, Ireland
Women's avg: N–O | Men's avg: T–U

Letter-Based (A–Z+4)

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Australian Ring Sizing

System: AU/NZ Letter System
Range: A – Z+4 (incl. half-sizes)
Based on: Inner circumference (mm)
Used in: Australia, NZ, UK, Ireland
Women's avg: N–O | Men's avg: T–U

Letter-Based (A–Z+4)

🇬🇧

NZ, AU and UK all use the same letter sizing system. If a ring is labelled UK size P, NZ size P, or AU size P — all three are identical. This means you can freely shop between NZ, Australian, and UK jewellers without any size conversion needed. The only conversions required are when cross-shopping with US, EU, or Japanese-sized rings.

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NZ / AU Ring Size Calculator

Enter your measurement or US/EU size to find your NZ / AU letter size

🇳🇿🇦🇺 NZ / AU

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New Zealand / Australia

🇺🇸 US

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US / Canada

🇪🇺 EU

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Europe

📐 Diameter

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Full NZ / AU Ring Size Chart

👩 Women's (F–P)

👨 Men's (N–Z+2)

📋 Full Chart

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Women's NZ / AU ring sizes most commonly fall between F and P. The average women's size in both New Zealand and Australia is NZ/AU N — equivalent to US 6¾, EU 54, circumference 53.8 mm.

NZ / AU Size	US Size	EU Size	Japan / China	Circumference (mm)	Diameter (mm)
F	3	44	5	44.2 mm	14.1 mm
G	3⅜	45	6	45.1 mm	14.4 mm
G½	3⅝	45.7	6.5	45.7 mm	14.6 mm
H	3¾	46	7	46.0 mm	14.6 mm
H½	4	46.7	7.5	46.7 mm	14.9 mm
I	4¼	47.3	8	47.3 mm	15.1 mm
I½	4½	48	8.5	48.0 mm	15.3 mm
J	4⅝	48.4	9	48.4 mm	15.4 mm
J½	5	49.3	9.5	49.3 mm	15.7 mm
K	5⅛	49.6	10	49.6 mm	15.8 mm
K½	5⅜	50.3	10.5	50.3 mm	16.0 mm
L	5½	50.6	11	50.6 mm	16.1 mm
L½	5⅞	51.6	11.5	51.6 mm	16.4 mm
M	6	51.9	12	51.9 mm	16.5 mm
M½	6¼	52.5	12.5	52.5 mm	16.7 mm
N ⭐	6½	53.2	13	53.2 mm	16.9 mm
N½	6¾	53.8	13.5	53.8 mm	17.1 mm
O ⭐	7	54.5	14	54.5 mm	17.4 mm
O½	7¼	54.8	14.5	54.8 mm	17.5 mm
P	7½	55.8	15	55.8 mm	17.8 mm

⭐ Women's avg: NZ/AU N = US 6½ = 53.2mm

⭐ NZ/AU O = US 7 = 54.5mm

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Men's NZ / AU ring sizes most commonly fall between N and Z+2. The average men's size in both New Zealand and Australia is NZ/AU T to U — equivalent to US 9⅝–10¼, circumference 61–63.5 mm.

NZ / AU Size	US Size	EU Size	Japan / China	Circumference (mm)	Diameter (mm)
N	6½	53.2	13	53.2 mm	16.9 mm
O	7	54.5	14	54.5 mm	17.4 mm
P	7½	55.8	15	55.8 mm	17.8 mm
P½	7¾	56.5	15.5	56.5 mm	18.0 mm
Q	8	57.2	16	57.2 mm	18.2 mm
Q½	8¼	57.7	16.5	57.7 mm	18.4 mm
R	8⅝	58.5	17	58.5 mm	18.6 mm
R½	8⅞	59.1	17.5	18.8 mm	59.1 mm
S	9⅛	60.0	18	60.0 mm	19.1 mm
S½	9⅜	60.7	18.5	60.7 mm	19.3 mm
T ⭐	9⅝	61.3	19	61.3 mm	19.5 mm
T½	10	62.3	19.5	62.3 mm	19.8 mm
U ⭐	10¼	62.9	20	62.9 mm	20.0 mm
V	10⅝	64.0	21	64.0 mm	20.4 mm
W	11⅛	65.2	22	65.2 mm	20.7 mm
X	11⅝	66.5	23	66.5 mm	21.2 mm
Y	12	67.5	24	67.5 mm	21.5 mm
Z	12½	68.8	25	68.8 mm	21.9 mm
Z+1	13	70.2	27	70.2 mm	22.3 mm
Z+2	13½	71.0	28	71.0 mm	22.6 mm

⭐ Men's avg: NZ/AU T = US 9⅝ = 61.3mm

⭐ NZ/AU U = US 10¼ = 62.9mm

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Complete NZ / AU ring size chart from F to Z+4. This is the full AU/NZ/UK letter sizing standard. Highlighted rows (gold) are the most commonly ordered sizes in New Zealand and Australia.

NZ / AU / UK	US Size	EU Size	Japan / China	Circumference (mm)	Diameter (mm)
F	3	44	5	44.2 mm	14.1 mm
G	3⅜	45.1	6	45.1 mm	14.4 mm
G½	3⅝	45.7	6.5	45.7 mm	14.6 mm
H	3¾	46	7	46.0 mm	14.6 mm
H½	4	46.7	7.5	46.7 mm	14.9 mm
I	4¼	47.3	8	47.3 mm	15.1 mm
I½	4½	48	8.5	48.0 mm	15.3 mm
J	4⅝	48.4	9	48.4 mm	15.4 mm
J½	5	49.3	9.5	49.3 mm	15.7 mm
K	5⅛	49.6	10	49.6 mm	15.8 mm
K½	5⅜	50.3	10.5	50.3 mm	16.0 mm
L	5½	50.6	11	50.6 mm	16.1 mm
L½	5⅞	51.6	11.5	51.6 mm	16.4 mm
M	6	51.9	12	51.9 mm	16.5 mm
M½	6¼	52.5	12.5	52.5 mm	16.7 mm
N ⭐	6½	53.2	13	53.2 mm	16.9 mm
N½	6¾	53.8	13.5	53.8 mm	17.1 mm
O ⭐	7	54.5	14	54.5 mm	17.4 mm
O½	7¼	54.8	14.5	54.8 mm	17.5 mm
P	7½	55.8	15	55.8 mm	17.8 mm
P½	7¾	56.5	15.5	56.5 mm	18.0 mm
Q	8	57.2	16	57.2 mm	18.2 mm
Q½	8¼	57.7	16.5	57.7 mm	18.4 mm
R	8⅝	58.5	17	58.5 mm	18.6 mm
R½	8⅞	59.1	17.5	59.1 mm	18.8 mm
S	9⅛	60	18	60.0 mm	19.1 mm
S½	9⅜	60.7	18.5	60.7 mm	19.3 mm
T ⭐	9⅝	61.3	19	61.3 mm	19.5 mm
T½	10	62.3	19.5	62.3 mm	19.8 mm
U ⭐	10¼	62.9	20	62.9 mm	20.0 mm
U½	10½	63.5	20.5	63.5 mm	20.2 mm
V	10⅝	64	21	64.0 mm	20.4 mm
V½	11	65	21.5	65.0 mm	20.7 mm
W	11⅛	65.2	22	65.2 mm	20.8 mm
W½	11⅜	65.8	22.5	65.8 mm	20.9 mm
X	11⅝	66.5	23	66.5 mm	21.2 mm
X½	11⅞	66.9	23.5	66.9 mm	21.3 mm
Y	12	67.5	24	67.5 mm	21.5 mm
Y½	12¼	68.1	24.5	68.1 mm	21.7 mm
Z	12½	68.8	25	68.8 mm	21.9 mm
Z½	12¾	69.4	25.5	69.4 mm	22.1 mm
Z+1	13	70.2	27	70.2 mm	22.3 mm
Z+1½	13½	71	28	71.0 mm	22.6 mm
Z+2	13¾	71.9	28.5	71.9 mm	22.9 mm
Z+3	14	72.5	29	72.5 mm	23.1 mm
Z+4	15	74.5	31	74.5 mm	23.7 mm

⭐ Women's avg: NZ/AU N = 53.2mm

⭐ Men's avg: NZ/AU T = 61.3mm

🇬🇧 NZ = AU = UK sizing

📐 EU ≈ circumference in mm

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What to Know When Shopping Between NZ and AU

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NZ and AU Sizes Are Identical

The letter-based AU/NZ ring size system is the same in both countries. A ring purchased in Auckland at NZ size O is the same as an AU size O from a Sydney jeweller. No conversion table or formula is needed — the letter is the size in both countries.

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UK Sizing is Also the Same

The UK ring size system is identical to both NZ and AU. All three countries use the same alphabet-letter standard, so rings from Goldsmiths, Tiffany UK, or any British jeweller labelled in UK sizes fit directly in NZ and AU without any conversion. Many charts show this as "AU/NZ/UK."

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US Sizes Are Different — Conversion Required

The US ring size system uses decimal numbers (e.g., US 7, 8.5, 10) which do not correspond directly to AU/NZ letters. If a ring from an American brand is labelled in US sizes, use the chart above or the calculator to find your NZ/AU equivalent before ordering.

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EU Sizes Are Different — Conversion Required

European ring sizes use the inner circumference in millimetres (e.g., EU 54, EU 62). This is a different presentation to the AU/NZ letter system, though the underlying measurement is the same. Use the chart above to convert EU mm sizes to your NZ/AU letter when shopping from European brands.

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Shopping Tips When Buying Between NZ and AU

🛍️Buy freely between NZ and AU jewellers — no conversion needed. Both Michael Hill NZ, Michael Hill AU, Shiels, Wallace Bishop, and other trans-Tasman jewellers all use the same NZ/AU letter sizing standard. Your NZ size letter is your AU size letter.
🇺🇸Convert US sizes before ordering from American brands. If ordering from brands like Tiffany US, Blue Nile, or Brilliant Earth, they display sizes in US numbers. Use the Full Chart tab above to find your NZ/AU letter's equivalent US number before adding to cart.
🇯🇵Convert Japanese sizes when buying from Japanese jewellers. Popular Japanese brands (NIWAKA, 4°C, Ete) display sizes in Japanese numbers (e.g., JP 13, 14, 20). NZ/AU N = JP 13, NZ/AU O = JP 14, NZ/AU T = JP 19-20. Use the full chart for exact equivalents.
⬆️Always size up when between two sizes. If your measured circumference falls between two letter sizes, always order the larger letter. A ring that is slightly too large can be resized down or worn with an adjuster insert. A ring too small cannot be worn at all.
🕗Measure your finger in the evening. Fingers are at their maximum daily size between 6pm and 9pm. Measuring in the morning can give a reading up to a full ring size smaller. This applies equally whether you are shopping in NZ or AU.

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Conversion Formulas

Circumference → Diameter

Diameter (mm) = Circumference (mm) ÷ 3.14159

Example: 53.8 mm ÷ 3.14159 = 17.1 mm → NZ/AU N½

Diameter → Circumference

Circumference (mm) = Diameter (mm) × 3.14159

Example: 19.5 mm × 3.14159 = 61.3 mm → NZ/AU T

Inches → mm

Circumference (mm) = Circumference (inches) × 25.4

Example: 2.14 inches × 25.4 = 54.4 mm → NZ/AU N½

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Frequently Asked Questions

Are NZ and AU ring sizes the same? ▾

Yes — NZ and AU ring sizes are completely identical. Both New Zealand and Australia use the same letter-based sizing system (A through Z+4). A ring labelled NZ size N is exactly the same size as an AU size N. No conversion is needed when shopping between the two countries.

Is NZ ring sizing the same as UK sizing? ▾

Yes — NZ, AU, and UK all use the same ring size system. The letter codes are the same across all three countries. Many international charts list this as the "AU/NZ/UK" sizing standard. A UK size Q is identical to an NZ size Q and an AU size Q.

What is NZ/AU size N in US sizing? ▾

NZ/AU size N equals US 6½. It has an inner circumference of approximately 53.2 mm and an inner diameter of 16.9 mm. AU/NZ N is the average women's ring size in both countries.

What is NZ/AU size T in US sizing? ▾

NZ/AU size T equals US 9⅝. It has an inner circumference of approximately 61.3 mm and an inner diameter of 19.5 mm. AU/NZ T is the average men's ring size in both New Zealand and Australia.

Do I need to convert my NZ size when buying from an Australian jeweller? ▾

No — your NZ size letter is your AU size letter. When ordering from Australian jewellers like Shiels, Michael Hill AU, Wallace Bishop, or Angara AU, simply select the same letter you wear in New Zealand. The sizing systems are identical and require no adjustment.

How do I convert my NZ size to EU or US for shopping internationally? ▾

Use the Full Chart tab above — find your NZ/AU letter in the first column and read across to the US or EU column. For quick reference: NZ/AU N = US 6½ = EU 53.2, NZ/AU O = US 7 = EU 54.5, NZ/AU T = US 9⅝ = EU 61.3, NZ/AU U = US 10¼ = EU 62.9.

What is the average ring size in New Zealand? ▾

The average women's ring size in New Zealand is NZ N to NZ O (US 6½–7, circumference 53–55 mm). The average men's ring size in New Zealand is NZ T to NZ U (US 9⅝–10¼, circumference 61–63 mm). These averages are the same as in Australia, as both countries share the same population demographics.

🟰 NZ = AU = UK sizing

⭐ Women's avg: NZ/AU N

⭐ Men's avg: NZ/AU T

🇺🇸 US sizes need conversion

🇯🇵 Japan sizes need conversion