UK to Australian Ring Size Conversion – Complete Chart & Guide

UK to Australian Ring Size Conversion

UK and Australian ring sizes use the same letter system — so UK Size N = AU Size N. Full conversion chart with diameter in mm, circumference, US, EU and Japan equivalents plus a free size calculator

🇬🇧 UK = 🇦🇺 AU Sizes ✅ Same Letter System 📐 Diameter in mm 🇺🇸 US Conversions 🇪🇺 EU / ISO Included 🧮 Free Calculator

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1:1

UK to AU
Exact Match

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A–Z

Shared Letter
Size System

👩

Women's Average
UK = AU Size

👨

Men's Average
UK = AU Size

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The Key Fact: UK = AU Ring Sizes

🇬🇧 = 🇦🇺

UK and Australian Ring Sizes Are Identical

The United Kingdom and Australia both use the same alphabetical ring sizing system.
A UK Size N is exactly the same as an Australian Size N. No conversion needed — just use the same letter.

🇬🇧

United Kingdom

⟺

🇦🇺

Australia

✅ UK Size J = AU Size J

✅ UK Size N = AU Size N

✅ UK Size T = AU Size T

✅ UK Size Z+1 = AU Size Z+1

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UK / AU Ring Size Conversion Chart – Full Table

UK = AU Size	Diameter (mm)	Circumference (mm)	🇺🇸 US / Canada	🇪🇺 EU / ISO	🇯🇵 Japan	Typical For
F	14.0 mm	44.0 mm	3.5	44	5	XS / Pinky
G	14.1 mm	44.4 mm	3.75	44	5	XS / Pinky
H	14.3 mm	44.8 mm	4	44.5	6	Small ♀
I	14.4 mm	45.1 mm	4.25	45	7	Small ♀
J	14.6 mm	45.8 mm	4.75	45.5	8	Women ♀
K	14.8 mm	46.5 mm	5.25	46	9	Women ♀
L	15.0 mm	47.1 mm	5.5	47	10	Popular ♀
M	15.3 mm	48.0 mm	6	47.5	11	Popular ♀
N ⭐	15.5 mm	48.7 mm	6.5	48	12	Avg Women ♀
O	15.7 mm	49.3 mm	7	49	13	Popular ♀
P	16.0 mm	50.2 mm	7.5	50	14	Women ♀
Q	16.2 mm	50.9 mm	8	51	15	Men / Large ♀
R	16.5 mm	51.7 mm	8.5	51.5	16	Men ♂
S	16.7 mm	52.4 mm	9	52	16	Men ♂
T ⭐	17.0 mm	53.2 mm	9.5	53	17	Avg Men ♂
U	17.2 mm	54.0 mm	10	53.5	17	Popular ♂
V	17.4 mm	54.7 mm	10.5	54	18	Men ♂
W	17.7 mm	55.5 mm	11	55	19	Large ♂
X	17.9 mm	56.2 mm	11.5	56	20	Large ♂
Y	18.1 mm	57.0 mm	12	56.5	21	XL ♂
Z	18.4 mm	57.8 mm	12.5	57	22	XL ♂
Z+1	18.6 mm	58.5 mm	13	58	23	XXL ♂
Z+2	18.8 mm	59.1 mm	13.5	59	24	XXL ♂
Z+3	19.1 mm	59.9 mm	14	59.5	25	XXL ♂

⭐ N = Most common women's size (UK & AU)

⭐ T = Most common men's size (UK & AU)

✅ UK letter = AU letter — always

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Quick Lookup – Women's Sizes (UK = AU)

15.0 mm
US 5.5

15.3 mm
US 6

⭐ AVERAGE

15.5 mm
US 6.5

15.7 mm
US 7

16.0 mm
US 7.5

⚠️ Proportional only — always use a ruler for accurate sizing.

👨

Quick Lookup – Men's Sizes (UK = AU)

16.5 mm
US 8.5

16.7 mm
US 9

⭐ AVERAGE

17.0 mm
US 9.5

17.2 mm
US 10

17.4 mm
US 10.5

⚠️ Proportional only — always use a ruler for accurate sizing.

🇺🇸

UK / AU to US Ring Size Conversion

UK = AU Size	🇺🇸 US Size	Diameter (mm)	Best For
H	4	14.3 mm	Pinky / XS
J	4.75	14.6 mm	Small ♀
K	5.25	14.8 mm	Small ♀
L	5.5	15.0 mm	Women ♀
M	6	15.3 mm	Popular ♀
N ⭐	6.5	15.5 mm	Avg Women ♀
O	7	15.7 mm	Popular ♀
P	7.5	16.0 mm	Women ♀
Q	8	16.2 mm	Men / Large ♀
R	8.5	16.5 mm	Men ♂
S	9	16.7 mm	Men ♂
T ⭐	9.5	17.0 mm	Avg Men ♂
U	10	17.2 mm	Popular ♂
V	10.5	17.4 mm	Men ♂
W	11	17.7 mm	Large ♂
Z	12.5	18.4 mm	XL ♂

🧮

Ring Size Calculator (UK / AU)

Enter your finger measurement to find your UK / Australian ring size instantly

Your UK = Australian Ring Size

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How to Measure Your Ring Size at Home

Method 1 — Paper Strip (Most Accurate)

Cut a thin paper strip

About 1 cm wide and 10 cm long. A piece of string or thin ribbon also works well.

Wrap around your finger

Wrap snugly around the base of the finger you'll wear the ring on — ensure it can slide over your knuckle comfortably.

Mark the overlap point

Mark where the paper meets with a pen. This measured length is your finger circumference in mm.

Measure in millimetres

Lay flat on a mm ruler and record the length. Enter it in the calculator above to get your UK / AU size.

Match to the chart above

Find your circumference in the full conversion chart above — your UK size and AU size will be the same letter.

Method 2 — Measure an Existing Ring

Choose a well-fitting ring

Pick a ring that fits the exact finger and hand you plan to wear the new ring on.

Measure the inner diameter

Lay it flat and measure straight across the inside opening using a mm ruler.

Match to the Diameter column

Find your measurement in the Diameter (mm) column of the full chart above to identify your UK = AU size.

📐 Conversion Formulas

Diameter → Circumference

Circumference (mm) = Diameter (mm) × 3.14159

Example: 15.5 mm × 3.14159 = 48.7 mm → UK / AU Size N (average women's)

Inches → Millimetres

mm = inches × 25.4

Example: 0.610″ × 25.4 = 15.5 mm → UK / AU Size N

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Why Are UK and AU Ring Sizes the Same?

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Shared British Standard

Australia adopted British standards in jewellery and crafts. Both countries use the same alphabetical ring gauge system developed in the UK.

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Same Letter System

Sizes run from A (smallest) through to Z+6 (largest). Each half-letter step represents approximately 0.4 mm increase in inside circumference.

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Also Used in NZ & Ireland

New Zealand, South Africa, and Ireland also use the exact same UK/AU alphabetical sizing system — so one chart covers all four countries.

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Different from US Sizes

US sizes use a numeric system (e.g. US 6.5 = UK/AU N). Always use the conversion chart when ordering from US-based jewellers or online stores.

🇪🇺

Different from EU Sizes

EU/ISO sizes (e.g. 47.5, 52, 53) represent the inside circumference in mm. EU 48 ≈ UK/AU N. Use the full chart to convert between EU and AU sizes.

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Use mm for Certainty

If you ever need to verify a size, use your inside diameter or circumference in millimetres — it is the most internationally accurate measurement.

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Tips for Using UK to AU Ring Size Conversions

✅UK letter = AU letter, always: If a ring is listed as UK Size P, you can order Australian Size P with full confidence — they are identical.
🇺🇸Be careful with US sizes: US sizes are numeric and different. Always double-check — US Size 7 ≈ UK/AU Size O, not Size 7. Never assume a number is a UK letter or vice versa.
📐Use mm if in doubt: Your finger circumference or inner ring diameter in millimetres works universally. Use the chart's mm column to convert to any system.
⬆️Between sizes? Go larger: If your measurement falls between two sizes on the chart, always choose the larger letter size. A slightly loose ring is far safer and more comfortable.
💍Wide bands need a bigger size: A wedding band 6 mm or wider fits tighter. Order one full size up from your measured size for any wide band style — in both UK and AU jewellers this applies equally.
🌡️Measure at the right time: Fingers swell in heat and shrink in cold. Measure in the afternoon at room temperature for the most accurate and comfortable everyday fit.
🏪UK online sellers ship to Australia: UK jewellers like Beaverbrooks, Goldsmiths, and Argos all use the same letter sizing — order your AU size directly. No conversion needed at checkout.
🔁Most rings can be resized 1–2 letters: Gold and silver rings can be resized up or down 1–2 letter sizes by a local Australian jeweller if your UK-purchased ring doesn't fit perfectly on arrival.

🌍

Countries That Use the Same System as UK / AU

Country / Region	Ring Size System	Same as AU?	Notes
🇬🇧 United Kingdom	Alphabetical (A–Z+6)	✅ Yes — Identical	Origin of the AU system
🇦🇺 Australia	Alphabetical (A–Z+6)	✅ Yes — Same	Adopted from UK standard
🇳🇿 New Zealand	Alphabetical (A–Z+6)	✅ Yes — Identical	Uses same UK/AU letters
🇮🇪 Ireland	Alphabetical (A–Z+6)	✅ Yes — Identical	Follows UK standard
🇺🇸 United States	Numeric (1–16)	❌ Different	US 6.5 ≈ AU/UK N
🇪🇺 Europe / ISO	Circumference in mm	❌ Different	EU 48 ≈ AU/UK N
🇯🇵 Japan	Numeric (1–30)	❌ Different	Japan 11 ≈ AU/UK N
🇮🇳 India	Numeric (1–30)	❌ Different	India 13 ≈ AU/UK N

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Frequently Asked Questions

Is a UK ring size the same as an Australian ring size? ▼

Yes — UK and Australian ring sizes are identical. Both countries use the same alphabetical sizing system (A through to Z+6), where each letter corresponds to the same inside diameter and circumference in millimetres. A UK Size N is exactly the same as an Australian Size N. No conversion is required.

What is UK Size N in AU, US, and EU sizing? ▼

UK/AU Size N has a diameter of approximately 15.5 mm and a circumference of around 48.7 mm. It is equivalent to US/Canadian Size 6.5 and EU/ISO Size 48. It is the most common average women's ring size in both the UK and Australia.

What is UK Size T in AU, US, and EU sizing? ▼

UK/AU Size T has a diameter of approximately 17.0 mm and a circumference of around 53.2 mm. It is equivalent to US/Canadian Size 9.5 and EU/ISO Size 53. It is the most common average men's ring size in both the UK and Australia.

Can I order a UK ring size from a UK jeweller and it will fit in Australia? ▼

Yes, absolutely. Because UK and AU ring sizes use the same letter system, a ring ordered as UK Size N from a UK jeweller (such as Beaverbrooks, Goldsmiths, or Ernest Jones) will fit the same as an AU Size N. There is no size difference at all — just make sure you've measured your finger correctly before ordering.

Are New Zealand ring sizes the same as Australian sizes? ▼

Yes. New Zealand, Australia, and the UK all use the same alphabetical ring sizing system. A ring size from any of these three countries will be an exact match. Ireland also uses the same system.

How do I convert a UK ring size to US? ▼

UK/AU sizes use letters while US sizes use numbers, so they do not match directly. Use the full conversion chart above to find the equivalent US size for any UK letter. As a quick reference: UK N ≈ US 6.5, UK T ≈ US 9.5, UK P ≈ US 7.5, UK R ≈ US 8.5.

What if my size falls between two letters? ▼

If your finger circumference or diameter falls between two sizes in the chart, always choose the larger letter size (e.g. if between N and O, choose O). A slightly loose ring is more comfortable and safer than one that is too tight. Most UK and Australian jewellers can resize a ring by 1–2 letters if needed.

What is the most accurate way to determine my ring size? ▼

The most accurate method is to use your finger circumference measured in millimetres — wrap a thin strip of paper around your finger, mark where the ends meet, and measure the length with a mm ruler. Measure 3 times across the day and average the results. Enter your measurement into the calculator above to find your exact UK / AU letter size.