Don’t Let the Wrong Ring Size Ruin Your Moment
Ordering a ring online? Maybe it’s for yourself, maybe you’re planning a surprise proposal (how exciting!), or maybe you’re just shopping online and want to avoid the hassle of returns. Either way, knowing your correct ring size and measurements is the first step to making sure that perfect ring actually fits.
If you’re in Australia, it can get a little confusing—ring sizes here are usually in letters, not numbers. And unless you’re popping into a jeweller, measuring at home is your best bet.
In this easy guide, We’ll walk you through how to measure your ring size at home, understand how ring sizes in letters and numbers work, and even how to avoid the common sizing mistakes. Whether you’re getting a ring size L, ring size 8 in letters, or something else entirely—We’ve got you.
What Are Ring Sizes and Measurements?
Let’s keep this simple.
A ring size is just a way to measure the inside of a ring so it fits snugly (but not too tight) around your finger. In Australia, we usually use alphabet letters to mark sizes—think A through Z, with L, M, and N being pretty common for women. That’s different from the numbered ring sizes used in the US or some other places.
So, what’s the difference between all these terms you keep seeing?
Lettered sizes: Standard in Australia (e.g. ring size I, ring size L, ring size U).
Numbered sizes: Common in the US (e.g. size 6, size 9). You may need to convert these if shopping from international stores.
Ring measurements: These are usually listed in millimetres and refer to either the inside diameter or circumference of the ring.
Ring sizing: The process of finding the correct size—either by measuring your finger or using a ring you already own.
For example:
Ring size L in Australia roughly equals a US size 6.
Ring size 8 in letters is generally around P½ in Australian sizing.
Knowing these basics can help you navigate sizing charts confidently and avoid any confusion when reading ring charts or ordering online.
💡 Quick Tip: If you’re buying a ring online and you see something like “ring size 8,” but you’re used to letters—don’t worry. We have a ring size chart or a conversion guide to help you out.
Still a bit fuzzy on how to figure out your exact size? Don’t stress. In the next section, We’ll show you exactly how to measure your ring size at home, step by step—with no fancy tools needed.
How to Measure Your Ring Size at Home (Step-by-Step)
Measuring your ring size at home is simple once you know the right methods. Whether you’re planning a surprise proposal or picking the perfect fit for yourself, here are three accurate and beginner-friendly ways to find your size.
Method #1: The String or Floss Method
This is the most popular DIY method because it uses items you already have at home.
What You’ll Need:
A piece of string or a strip of paper (around 6mm wide)
A ruler (with millimetres)
A pen
Steps:
First, wrap the string or paper around the base of your finger.
Make sure it’s snug but not tight—it should slide over your knuckle.
Then mark where the end meets the rest of the strip.
Finally easure the length from the start to the mark (in mm).
Use our Ring Size Chart to match your measurement with the correct AU ring size.
✅ Best For: Quick sizing at home
🚫 Avoid If: You’re using stretchy string or can’t measure precisely
Method #2: Paper and Ruler Method
If you already have a ring that fits the finger you’re buying for, this method is a quick and easy way to work out your ring size using just a piece of paper and a ruler. It’s great for measuring discreetly—especially if you’re planning a surprise.
What You’ll Need:
A piece of paper
A fine-tipped pen or pencil
A ruler (with millimetres)
Steps:
Place the ring flat on a sheet of paper.
Carefully trace the inside edge of the ring with your pen or pencil.
Use a ruler to measure the diameter (in mm) of the circle you’ve drawn.
Match that measurement to a ring size chart to find the correct Australian letter size.
This method is especially handy when you already have a ring but no access to sizing tools. Just make sure the ring sits flat and your tracing is neat—rings with large stones or uneven settings can throw off the measurement slightly.
Method #3: Using a Ring You Already Own
If you already have a ring that fits the correct finger, you can measure its internal diameter.
What You’ll Need:
A ruler or caliper
The ring you want to size
Steps:
Place the ring on a flat surface.
Measure straight across the inside diameter of the ring (in mm).
Compare it with our conversion chart below.
✅ Best For: Replacing an existing ring
🚫 Avoid If: The ring is misshapen or worn out
Method #4: Using a Plastic Ring Sizer (Most Accurate at Home)
Plastic ring sizers are small, affordable tools that work like a mini belt or set of rings. You can order one online or request one from us at DDS Diamonds!
How it works:
- Try different sizes until one fits snugly at the base of your finger.
- Make sure it slides over your knuckle comfortably.
- Note the letter or number marked on the tool.
✅ Best For: Most accurate DIY method
🚫 Avoid If: You’re in a hurry and don’t have one on hand
Which Method Is Best?
Each method has its benefits, and the best one depends on what you have on hand and how accurate you need to be. Here’s a quick breakdown:
Paper, string, or floss: Perfect for quick checks but slightly less accurate if not measured carefully.
Existing ring: Fast and useful if you know the ring already fits the intended finger.
Plastic sizer: Most precise method for home use. Great if you’re ordering a special piece.
If you’re still unsure—or want peace of mind—you can always pop into DDS Diamonds for a free in-store ring sizing. Our jewellers use professional tools to measure precisely, so your ring fits just right from day one.
Call us today or visit our Adelaide showroom. We’re happy to help with sizing, design ideas, or finding a special ring for any occasion.
Ring Size Conversion Chart: Letters to Numbers (Australia & Beyond)
Ring sizes can be confusing, especially when you’re shopping online or comparing international sizes. In Australia, we use letters (like K, L, M), while other countries often use numbers. If you’re buying from a US, UK, or EU brand, it helps to understand how those letters translate.
Here’s a quick reference to help:
💡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.
Mistakes to Avoid When Measuring Ring Size at Home
Getting the size wrong is more common than you’d think—but it’s easy to avoid with a few smart tips.
Here are the most common ring sizing mistakes:
Mistake 1: Ignoring Finger Fluctuations
Your fingers aren’t the same size all day long. Temperature, activity, salty meals, or even sleep can make them swell or shrink—sometimes by as much as two full sizes. Measuring first thing in the morning, after a hot shower, or post-exercise can give you inaccurate results.
💡Ring sizing tip: Measure your ring size mid-morning or mid-afternoon when your hands are cool and relaxed—not too warm, not too cold—for the most reliable measurement.
Mistake 2: Not Considering Knuckle Size
If you have larger knuckles or tapered fingers, you’ll need to account for both comfort and accessibility. A ring that fits perfectly at the base of your finger might not slide over your knuckle—or it might spin loosely once it’s on.
💡What to do: If your knuckles are prominent, it’s best to get fitted by a professional jeweller. At DDS Diamonds, we can recommend clever adjustments like adding tiny gold beads (called sizing beads) inside the ring to help it sit snugly without being too tight over the knuckle.
Have knuckle concerns? Visit us in-store or get in touch to chat with a jeweller about fit options.
Mistake 3: Measuring the Wrong Hand
Fun fact: your dominant hand is usually slightly bigger than the other. That means a ring that fits your left hand might not fit your right—and vice versa.
💡 Ring sizing advice: Always measure the exact finger on the hand where you’ll wear the ring. For engagement or wedding rings, this is typically the left ring finger—but always double-check!
Mistake 4: Choosing the Wrong Size for Wide Bands
Wider bands can feel tighter because they cover more of your finger. If you’re measuring with a slim ring or plastic sizer and buying a chunky style, the fit might end up too tight.
💡 What to know: When in doubt, go half a size up for wider bands. We can also help you try wider ring sizers in-store so you can be confident before you commit.
Mistake 5: Not Accounting for In-Between Sizes
Ring sizes move in tiny increments—just 0.8mm of diameter between each size. That’s why some people fall right between two sizes. Choosing the wrong one can make the ring uncomfortable or too loose.
💡 Pro tip: If you’re between sizes, err on the side of slightly larger (especially in summer). Or better yet, visit DDS Diamonds for a proper ring sizing session where we can help you test both standard and wide band rings.
Prefer Not to Risk It?
We get it—measuring your own ring size at home can feel tricky, even with the best methods. That’s why our friendly team at DDS Diamonds is here to help.
Visit our Adelaide showroom for a free professional ring sizing, or give us a call to chat about your options. Whether it’s a custom piece, a surprise proposal, or simply upgrading your style—we’ll make sure it fits perfectly from day one.
Bonus: Curious about 2025 ring prices? Read our latest Average Engagement Ring Price Guide 2025 In Australia.
Tips to Get the Most Accurate Ring Measurement
Even when you’re measuring your ring size at home, a few small adjustments can make a big difference. If you’re wondering how to check ring size accurately, these simple tips will help you get it right the first time.
Start by measuring your finger at the end of the day. That’s when your hands are at their most natural size—not too swollen, not too cold. Avoid checking your size in the early morning or after a workout, bath, or big meal, as your fingers might temporarily expand or shrink.
If you’re using a string or a paper strip, don’t pull it too tight or leave it too loose. It should sit snugly but comfortably around the finger. Always repeat the measurement 2–3 times to confirm consistency, especially if you’re planning a surprise proposal or buying a custom piece.
How to Tell What Size Ring You Are (Without Measuring)
Wondering how to find your ring size without measuring your finger directly? If you already have a ring that fits well on the finger you’re buying for, you’re halfway there.
Place that ring on top of a printable ring size guide or sizing chart (like this one) and match it to the circle that aligns perfectly with the inside edge of your ring. Make sure the black circle just touches the inner diameter of the ring without overlapping. This is one of the easiest ways to find your ring size in letters or numbers without any special tools.
You can also use a ruler to measure the diameter of the ring in millimetres and refer to a ring size chart for Australia to convert it to your correct size—such as Size L, N½, or Q.
Helpful Post: Budget questions? Here’s how much you should spend on an engagement ring in 2025.
Know Your Ring Size with Confidence
Finding your perfect ring size doesn’t have to be complicated. With simple tools, a bit of patience, and the tips we’ve shared, you can confidently measure your ring size at home—whether you’re treating yourself, planning a surprise proposal, or gifting something special.
But if you’re still unsure or want a second opinion, visiting a professional is always worth it. At DDS Diamonds in Adelaide, we’re here to help with free expert fittings, advice on sizing adjustments, and beautiful rings made to fit perfectly.
Ring Sizing FAQs in Australia (Quick & Clear Answers)
Looking for a fast answer? Below are the most searched questions about ring sizes and measurements in Australia—answered clearly to help you shop confidently.
How do I measure ring size at home?
Use a string, paper strip, or existing ring. Measure the circumference or diameter and match it with a sizing chart.
What is Size 6, 8, 9 in letters?
Size 6 = L½ or M
Size 8 = P½ or Q
Size 9 = R½ or S
Use a conversion chart to double-check if ordering internationally.
What’s the most common ring size for women?
In Australia, the most common women’s ring sizes are between L and O. Men’s sizes usually range from R to U.
Can I measure ring size using an existing ring?
Yes! Place it on a sizing chart or measure its diameter, then compare with the guide.
What if I’m between two ring sizes?
Go with the larger size for comfort. Wider bands fit tighter, so adjust accordingly. Or visit a jeweller for a more tailored recommendation.
