Everything you need to find your Australian ring size — full letter chart from F to Z+1, diameter in mm & inches, circumference, visual scale, step-by-step measuring methods, and conversions to US, UK, EU, India & Japan.
8 min read
Updated: April 2026
AU Ring Guide Editorial Team
Finding your Australian ring size doesn't need to be confusing. Australia uses a straightforward letter-based sizing system — running from F (smallest) to Z+1 (largest) — identical to the UK system and used equally in New Zealand. This guide covers every size with full measurements, a built-in calculator, visual comparison, and international conversion table.
🔑 Quick Answer
The most common Australian ring size is Size N for women (⌀ 16.9 mm) and Size T for men (⌀ 19.5 mm). If buying as a surprise, these are your safest defaults across Australia and New Zealand.
N
Most Common Women's Size
T
Most Common Men's Size
38
Full & Half Sizes in Chart
F–Z+1
Complete AU Size Range
🇳🇿
Same as NZ Sizes
🧮 Ring Size Calculator
Enter your finger measurement below — circumference or diameter, in mm or inches — and instantly find your Australian ring size letter.
Find Your AU Ring Size Instantly
Your Australian Ring Size
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📊 Complete Australian Ring Size Chart
All 38 full and half-letter Australian ring sizes, from F to Z+1. Each row shows inner diameter and circumference in both mm and inches, plus a typical wearer guide. Green-highlighted rows are the most commonly purchased sizes.
AU / NZ
Diam. (mm)
Diam. (in)
Circ. (mm)
Circ. (in)
Typical Wearer
⭐ Size N = Most common women's size in Australia
⭐ Size T = Most common men's size in Australia
🇳🇿 Same scale used in New Zealand
👁️ Visual Ring Size Scale
These circles are drawn proportionally to represent the relative diameter of each size — from the smallest (F) to the largest (Z+1).
⚠️ Proportional representation only — not exact print scale. Always use a ruler for accuracy.
Here's a closer look at the five most commonly purchased Australian ring sizes side by side:
📏 How to Measure Your Ring Size at Home
You don't need to visit a jeweller to get an accurate size. Two reliable methods work perfectly at home using items you already own.
Method 1 — Paper Strip or String (Most Accurate)
1
Cut a thin paper strip
About 1 cm wide and 10 cm long. A piece of string, dental floss, or thin ribbon works equally well.
2
Wrap around the finger base
Wrap snugly around the base of the finger, ensuring it still passes comfortably over the knuckle.
3
Mark the overlap point
Use a pen to mark exactly where the two ends meet — this is your finger circumference.
4
Measure with a ruler in mm
Lay the strip flat. Record the measurement in mm, then enter it in the calculator above.
5
Match to the chart
Find the closest number in the Circumference (mm) column — that letter is your AU size.
Method 2 — Measure an Existing Ring
1
Choose a well-fitting ring
Select a ring that fits comfortably on the exact finger you want to size.
2
Measure the inner diameter
Use a mm ruler to measure straight across the inside opening of the ring.
3
Match to the Diameter column
Find that mm value in the Diameter (mm) column in the chart above.
📐 Conversion Formula
Circumference (mm) = Diameter (mm) × 3.14159
Example: 16.9 mm × 3.14159 = 53.1 mm → AU Size N
🔄 International Ring Size Conversion
Australian ring sizes use the same letter scale as UK and NZ. The table below converts key AU sizes to US, UK, EU, Indian, and Japanese equivalents.
🇦🇺 AU
🇺🇸 US
🇬🇧 UK
🇪🇺 EU
🇮🇳 India
🇯🇵 Japan
⌀ mm
Circ mm
F
3
F
44
4–5
4
14.1
44.2
H
4
H
47
6–7
7
14.9
46.8
J½
5
J½
49
9
9
15.7
49.3
L
5½
L
51
11
11
16.3
51.2
M
6
M
52
12
12
16.5
51.9
N
6½
N
53
13
13
16.9
53.1
O
7
O
55
15
14
17.3
54.5
P
7½
P
56
16
15
17.7
55.8
Q
8
Q
57
17
16
18.2
57.2
R
8½
R
58
18
17
18.6
58.5
S
9
S
60
19
18
19.1
60.0
T
9½
T
61
20
19
19.5
61.3
U
10
U
63
21
20
20.0
62.9
V
10½
V
64
22
21
20.3
63.8
W
11
W
65
23
22
20.9
65.5
Z
12½
Z
68
25
25
21.9
68.8
Z+1
13
Z+1
70
26+
26
22.3
70.2
⚡ Quick Reference by Person
Not sure which size to pick? Use these typical ranges as a starting point for each group.
👧 Children (5–12 yrs)
F – I
14.1 – 15.1 mm diameter
Safe default: Size H
👩 Teen Girls
I – L
15.1 – 16.3 mm diameter
Safe default: Size J
👩 Average AU Women
L – Q
16.3 – 18.2 mm diameter
Safe default: Size N ⭐
👨 Average AU Men
Q – U
18.2 – 20.0 mm diameter
Safe default: Size T ⭐
💪 Large-Framed Men
U – Z+1
20.0 – 22.3 mm diameter
Safe default: Size W
🖐️ Ring Size by Finger
Different fingers require different sizes. Use the guide below to choose the right measurement approach for each finger.
Thumb
AU Size W – Z · Needs wide comfort-fit band
Index / Pointer
AU Size L – P · Often 1 letter larger than ring finger
Middle Finger
AU Size M – R · Usually the largest finger
Ring Finger
AU Size I – P · Most popular for engagement & wedding rings
Pinky
AU Size F – J · Perfect for stacking & signet rings
👆
Index Finger
AU Size L – P Often 1 size larger than ring finger
🖕
Middle Finger
AU Size M – R Usually the largest finger
💍
Ring Finger
AU Size I – P Most popular for jewellery
🤙
Pinky Finger
AU Size F – J Stacking & signet rings
👍
Thumb
AU Size W – Z Always use comfort-fit
👧
Children
AU Size F – I Always measure — varies widely
🏪 Ring Sizing at Top Australian Jewellers
All major Australian jewellers use the same AU letter scale. Here's what to expect at each brand.
💎
Michael Hill
AU standard letter sizing with free in-store ring sizer service
🌟
Shiels Jewellers
AU/NZ letter sizing, printable ring sizer & free store sizing
✨
Musson Jewellery
Full AU size chart published, free resizing within 60 days
💍
Hardy Brothers
AU standard sizing, complimentary fitting at every store
🔶
Lovisa
AU letter sizes, wide fashion range from F to Z
⭐
Zwischen
AU + EU sizes, ethical handmade rings with free sizing
💡 Expert Ring Sizing Tips
🌅Measure in the evening — fingers are naturally at their largest after a full day of activity.
🌡️Avoid measuring when hands are cold — cooler fingers are narrower and give a falsely small reading.
📐If you fall between two sizes, always size up — a half letter too large is far more comfortable than too tight.
🔁Measure both hands — your dominant hand is often one letter size larger due to muscle use.
💎Wide bands (6 mm or more) feel tighter — order one half-letter larger for a wide wedding band.
🎁Buying as a surprise in Australia? Size N for women and Size T for men are the safest guesses.
☀️In Australian summer, fingers swell in heat — measure in warm conditions for year-round jewellery.
📏Measure at least 3 times and average — this eliminates small errors and gives the most accurate result.
🔧Most Australian jewellers — Michael Hill, Shiels, Musson — offer free ring resizing within 30–60 days.
❓ Frequently Asked Questions
What is the most common ring size for women in Australia?▼
The most common ring size for Australian women is Size N (⌀ 16.9 mm, circumference 53.1 mm), which equals US Size 6½. Sizes M, N, and O cover the majority of women's ring purchases across Australia.
What is the most common ring size for men in Australia?▼
The most common Australian ring size for men is Size T (⌀ 19.5 mm, circumference 61.3 mm), equal to US Size 9½. Sizes S, T, and U account for the majority of men's ring purchases in Australia.
Are Australian and UK ring sizes the same?▼
Yes — Australia and the UK use the identical alphabetical ring sizing system. AU Size N is exactly the same as UK Size N. New Zealand uses this same scale too, so AU, UK, and NZ sizes are fully interchangeable.
How do I convert my Australian ring size to US?▼
AU and US sizes use different systems. AU Size N equals approximately US Size 6½, and AU Size T equals approximately US Size 9½. Use the conversion table above for the full AU-to-US comparison.
Can a ring be resized by Australian jewellers?▼
Yes. Gold, silver, and platinum rings can typically be resized 1–2 letter sizes. Tungsten, titanium, and stainless steel rings usually cannot be resized. Michael Hill and Shiels offer free resizing within 60 days of purchase.
Does band width affect sizing in Australia?▼
Yes. Bands wider than 6 mm sit higher on the finger and feel tighter. For wide wedding bands, order one half-letter size larger than your standard measurement for a comfortable daily fit.
Are NZ ring sizes the same as Australian ring sizes?▼
Yes — New Zealand and Australia use the exact same letter-based ring size system. AU Size N and NZ Size N are identical in every measurement. All data in this chart applies equally to New Zealand shoppers.
Can I measure my ring size accurately at home?▼
Yes. You only need a thin strip of paper and a mm ruler. Wrap around your finger, mark the overlap point, measure in mm, and enter it into the calculator above for your instant AU letter size.
Our editorial team specialises in Australian jewellery sizing, compiling data from Michael Hill, Shiels, Musson, and Hardy Brothers to provide the most accurate AU ring size information for Australian and New Zealand shoppers.
📬 Get Our Free Printable Ring Size Guide
Full AU size chart PDF + at-home ring sizer — delivered to your inbox instantly and free.