Don’t Let the Wrong Ring Size Ruin Your Moment
To measure your ring size at home, wrap a 6mm strip of paper around the base of your finger, mark where it overlaps and measure the length in millimetres. That number is your finger’s circumference, and the chart below converts it to an Australian letter size. Measure in the afternoon at room temperature and repeat three times for an accurate result.
Getting it right matters. Half a size out is enough for a ring to spin on your finger or refuse to pass your knuckle, and because Australia sizes rings in letters while most overseas stores use US numbers, conversion is where most sizing mistakes start. Below are four ways to measure ring size at home, an Australian ring size chart, and how to find a partner’s size without them knowing.
How Ring Sizes Work in Australia?
Australia uses the same lettered system as the UK, running from A to Z, with half sizes in between (L½, M½). The US and Canada use numbers, and Europe uses the inside circumference in millimetres.
Every system measures the same thing: the inside of the ring. You can express it two ways.
- Inside circumference: the distance around the inside of the band. This is what you get from wrapping paper around your finger.
- Inside diameter: the distance straight across the inside of the band. This is what you get from measuring a ring you already own.
The gap between each letter is small, about 0.4mm in diameter or 1.3mm around the finger. That’s why careful measuring matters.
Australian Ring Size Chart (Letters, mm and US)
Australian size | Inside diameter (mm) | Inside circumference (mm) | Closest US size |
H | 14.65 | 46.0 | 3¾ |
I | 15.04 | 47.3 | 4¼ |
J | 15.40 | 48.4 | 4⅝ |
K | 15.80 | 49.6 | 5⅛ |
L | 16.10 | 50.6 | 5½ |
M | 16.51 | 51.9 | 6 |
N | 16.92 | 53.2 | 6½ |
O | 17.35 | 54.5 | 7 |
P | 17.75 | 55.8 | 7½ |
Q | 18.19 | 57.2 | 8 |
R | 18.61 | 58.5 | 8½ |
S | 19.10 | 60.0 | 9 |
T | 19.51 | 61.3 | 9½ |
U | 20.02 | 62.9 | 10 |
V | 20.32 | 63.8 | 10½ |
W | 20.76 | 65.2 | 11 |
Average Ring Sizes in Australia
Most women in Australia wear between L and O, with M and N the most common. Most men fall between R and V. Treat these as a starting point only, since finger size varies far more than height or shoe size.
Converting US Ring Sizes to Australian Sizes
Each whole US size equals roughly two Australian letters. A US 6 is about an M, a US 7 about an O, a US 8 about a Q and a US 9 about an S. When you’re buying from an overseas store, convert from your measurement in millimetres, never letter to number from memory, since charts from different brands can differ by half a size.
How to Find Your Ring Size at Home: 4 Methods
There are four reliable ways to measure ring size at home, and the right one depends on what you have on hand. A ring sizer gives the most accurate result and a ring you already own comes a close second, while a paper strip or printable chart gets you a solid starting point in minutes.
Method 1: The Paper Strip Method
This is the easiest way to find out ring size with nothing but household items. Use paper, not string. String stretches and twists, which can throw the result out by a full size.
You’ll need: a strip of paper about 6mm wide, a pen and a ruler marked in millimetres.
- Wrap the strip around the base of the finger you’ll wear the ring on.
- Pull it snug, so it sits flat against the skin without pinching.
- Mark the point where the paper overlaps.
- Lay the strip flat and measure from the end to your mark in millimetres.
- Find that number in the circumference column of the chart above.
Now slide the paper loop over your knuckle. If it won’t pass, go up half a size.
Method #2: How to Know Your Ring Size Without Measuring
Print a ring size chart with circles printed to scale, place your ring on top, and find the circle that sits exactly inside the band without showing a gap.
The catch is printing. Set your printer to 100% or actual size, never “fit to page”. Then check the scale by laying a credit card on the page, which should measure 85.6mm across. If the card and the printed ruler disagree, the sizes will be wrong.
Method #3: Using a Ring You Already Own
If you have a ring that fits the right finger, measure its inside diameter.
- Lay the ring flat on a table.
- Measure straight across the inside, edge to edge, at the widest point, in millimetres.
- Find that number in the diameter column of the chart.
A ruler gets you close. A pair of digital callipers gets you exact. Skip rings that are bent out of round or worn thin, since they’ll give a false reading.
Method #4: Use a Ring Sizer
A ring sizer is the most accurate way to measure ring size at home. It’s a set of plastic or metal sample rings, or an adjustable plastic strip, marked with each size.
- Try sizes until one slides over your knuckle with slight resistance.
- Check it sits snug at the base of your finger without spinning freely.
- Wear it for a few minutes and shake your hand. If it stays put, that’s your size.
Pick up a free ring sizer from our Burnside studio, or ask us to post one to you.
Which Method Is Best?
Method | Accuracy | Best for |
Ring sizer | High | Buying an engagement or wedding ring online |
Ring you own | High, if the ring fits well | Matching a ring you already love |
Printable chart | Medium, depends on print scale | A quick check with no ruler |
Paper strip | Medium | Finding a starting point fast |
Professional sizing | Highest | Any ring you’ll wear every day |
5 Mistakes That Give You the Wrong Ring Size
Most wrong ring sizes come from how and when the finger was measured, not from the method used. These five mistakes cause the majority of sizing errors, and each one takes only a moment to avoid.
1. Measuring at the Wrong Time
Fingers swell in heat and after exercise, salty meals or a hot shower, and shrink in the cold. In an Adelaide summer the difference can reach a full size. Measure in the afternoon, indoors at a comfortable temperature, and repeat on a second day if you can.
2. Ignoring Your Knuckle
If your knuckle is wider than the base of your finger, a ring sized for the base won’t go on, and one sized for the knuckle will spin. Size for the knuckle, then ask about sizing beads: two tiny metal beads inside the band that stop the ring turning without making it harder to put on.
3. Measuring the Wrong Hand
Your dominant hand is usually slightly larger. Measure the exact finger, on the exact hand, where the ring will be worn. In Australia, engagement and wedding rings normally go on the left ring finger.
4. Forgetting Band Width
A wide band covers more skin, so it feels tighter than a slim band of the same size. For bands 6mm wide or more, go up half a size from what a slim sizer shows.
5. Rounding Down When You’re Between Sizes
If your measurement falls between two sizes, choose the larger one. A slightly loose ring is easy to wear in winter and comfortable in summer, while a tight one becomes impossible on a hot day.
How Should an Engagement Ring Fit?
An engagement ring should slide over your knuckle with slight resistance, sit snug at the base of your finger, and need a gentle twist to come off. It shouldn’t leave a deep mark or turn freely when you shake your hand.
Wear it through a full day before deciding. A ring that feels tight first thing in the morning may be perfect by afternoon, and one that feels perfect in winter may pinch in January.
How to Find Your Partner's Ring Size Secretly
Keep the proposal a surprise by working out their size without a tape measure in sight. These work best in order of accuracy.
- Borrow a ring they already wear. Choose one from the same finger on the left hand, and measure its inside diameter. Put it back before it’s missed.
- Press it into soap or modelling clay. If you can’t take the ring out of the house, press it halfway into a bar of soap. Bring the impression to a jeweller.
- Trace the inside. Draw around the inside edge of the ring on paper with a fine pen.
- Ask a friend or family member. Someone who has shopped for jewellery with them may know, or can find out without raising suspicion.
- Compare against your own fingers. Slide one of their rings onto your finger and mark how far it goes. A jeweller can estimate the size from that point.
A ring from the right hand or another finger won’t match the left ring finger. If that’s all you have, tell your jeweller which finger it came from.
What If the Size Is Wrong?
Most rings can be adjusted after the proposal. A plain or stone-set band can usually move up or down by two sizes without trouble. If you’re unsure, err slightly large, since making a ring smaller is simpler than making it bigger. Our ring resizing service in Burnside handles most adjustments the same day or the next.
💡Tip: If you’ve already measured your finger with a string or paper strip, use the inside circumference to find your size. You can also compare a ring you already own by measuring its diameter and matching it here.
Bonus: Curious about 2025 ring prices? Read our latest Average Engagement Ring Price Guide 2025 In Australia.
Helpful Post: Budget questions? Here’s how much you should spend on an engagement ring in 2025.
Ring Sizing FAQs in Australia (Quick & Clear Answers)
Quick answers to the ring size questions Australians search for most, from average sizes for men and women to converting US sizes into letters.
Wrap a 6mm paper strip around the base of your finger, mark the overlap, and measure the length in millimetres. Match that circumference to an Australian ring size chart.
A US 6 is about an M, a US 7 about an O, a US 8 about a Q and a US 9 about an S. Charts differ slightly between brands, so convert from millimetres where you can.
Neither. It should pass the knuckle with slight resistance and sit snug at the base without spinning or leaving a mark.
Choose the larger size. Fingers swell in warm weather, and a slightly loose ring can be fitted with sizing beads.
Go with the larger size for comfort. Wider bands fit tighter, so adjust accordingly. Or visit a jeweller for a more tailored recommendation.
Measure your finger with a paper strip or a ring sizer, or measure the inside diameter of a ring that already fits. A free professional sizing at a jeweller is the most reliable option.
Most Australian women wear between L and O, with M and N the most common sizes.
Most Australian men wear between R and V.
Borrow a ring she wears on her left ring finger and measure its inside diameter, press it into soap, or ask a close friend. Choose slightly larger if unsure, since a ring can be resized after the proposal.
Up. A is the smallest Australian size and each letter after it is larger, so an N is bigger than an M.
Get Sized Properly in Burnside
Skip the guesswork with a free professional ring sizing at our Burnside studio, using metal sizers in both slim and wide band widths. It takes five minutes, and you’ll leave knowing your size for every ring you buy from now on.
Visit us at 46 High St, Burnside, Tuesday to Friday 9am to 6pm or Saturday 9:30am to 2pm. Call (08) 8332 0707 or book a time that suits you.
Planning a proposal? Read How Much Should You Really Spend on an Engagement Ring in 2026?
