How to Measure Your Ring Size at Home
Finding your perfect fit is easy.
Use our guide below to measure accurately, and if you're between sizes, size down – our comfort-fit interior makes rings easier to slide on.
Not quite right? No problem. We offer free exchanges within 30 days – just let us know and we'll send the correct size.
Four Ways to Find Your Ring Size
- Visit any high street jeweller
- Ask to be sized (free service)
- Mention you need an 8mm wide ring
- Ask about comfort fit sizing
Expert advice accounts for width and fit
- Request your free sizer online
- Receive it within 2-3 days
- Wrap around finger like a belt buckle
- Read your US size from the gauge
- Find a ring that fits well
- Measure the inside diameter
- Use a ruler in millimetres
- Match to size chart below
Use our printable sizer for easy matching
- Wrap string around finger base
- Mark where it meets
- Measure the length in mm
- Match circumference to chart
Requires careful technique
📄 Printable Ring Sizer
Download and print our sizing tool to measure at home. It includes both a ring sizer strip and a chart to match against your existing rings—all on one page.
⚠️ Critical: Print at 100% Scale
For accurate results, you must print at actual size (100% scale). Do not select "fit to page" or "shrink to fit"—this will give you an incorrect size. After printing, measure the reference line to verify accuracy before using.
Note: Foundoria products use US sizes. Our free ring sizer also displays US sizes for easy ordering.
| US Size | UK/AU Size | EU Size | Diameter (mm) | Circumference (mm) |
|---|---|---|---|---|
| 5 | J½ | 49 | 15.7 | 49.3 |
| 5.5 | K½ | 50 | 16.1 | 50.6 |
| 6 | L½ | 51 | 16.5 | 51.8 |
| 6.5 | M½ | 52 | 16.9 | 53.1 |
| 7 | N½ | 54 | 17.3 | 54.4 |
| 7.5 | O | 55 | 17.7 | 55.7 |
| 8 | P½ | 57 | 18.1 | 56.9 |
| 8.5 | R | 58 | 18.5 | 58.2 |
| 9 | S | 59 | 19.0 | 59.5 |
| 9.5 | T | 60 | 19.4 | 60.8 |
| 10 | U | 62 | 19.8 | 62.1 |
| 10.5 | V | 63 | 20.2 | 63.3 |
| 11 | W | 64 | 20.6 | 64.6 |
| 11.5 | X | 66 | 21.0 | 65.9 |
| 12 | Y | 67 | 21.4 | 67.2 |
| 12.5 | Z | 68 | 21.8 | 68.4 |
| 13 | Z+1 | 70 | 22.2 | 69.7 |
| 13.5 | Z+2 | 71 | 22.4 | 71.0 |
| 14 | Z+3 | 73 | 22.8 | 72.3 |
| 14.5 | Z+4 | 74 | 23.0 | 73.6 |
| 15 | Z+5 | 75 | 23.2 | 74.8 |
Highlighted rows: Most common men's ring sizes (US 8–10 / UK P½–U)
About Our Free Ring Sizer
Our complimentary ring sizer is an adjustable plastic tool that wraps around your finger like a belt buckle. Simply slide it on, tighten to a comfortable fit, and read your size from the gauge. It displays US sizes, which match the size options shown on our product pages for easy ordering.
✓ How to use it: Wrap the sizer around the base of your ring finger (where the ring will sit). Tighten until it feels snug but comfortable—you should be able to slide it over your knuckle with slight resistance. Read the size where the end meets the gauge.
💡 Using UK Sizes? If a jeweller has given you a UK letter size, simply use the conversion chart above to find the equivalent US size when ordering. For example, UK size R = US size 8.5.
Request your free ring sizer and it will arrive within 2-3 days via Royal Mail.
Method 1: Visit a Local Jeweller (Recommended)
For the most accurate sizing, visit any high street jeweller. This service is typically free and takes just a few minutes.
Why This Is the Best Option:
- Expert advice: Jewellers understand how ring width affects fit
- Comfort fit consideration: They can advise on sizing for comfort fit bands
- Knuckle assessment: They'll consider your knuckle size vs finger base
- Professional tools: Proper sizing rings give accurate results
✓ What to tell the jeweller: "I'm buying an 8mm wide tungsten ring with a comfort fit interior. Can you recommend the best size?" This information helps them give you accurate advice for Foundoria rings specifically.
Method 2: Measure an Existing Ring
If you have a ring that fits the correct finger well, this is a reliable home method. You can also use our printable ring sizer which includes a ring matching chart for easy comparison.
Select the Right Ring
Choose a ring that fits comfortably on the same finger you'll wear your new ring. Ensure it's a ring you wear regularly—not one that's been sitting in a drawer.
Important: The ring should slide over your knuckle with slight resistance but sit comfortably at the base of your finger.
Measure the Inside Diameter
Place the ring on a flat surface. Using a ruler with millimetre markings, measure straight across the inside of the ring at its widest point.
Tip: Measure twice to confirm. Even half a millimetre matters.
Match to Size Chart
Find your measurement in the "Inside Diameter" column of the size chart above, then note the corresponding US size for ordering.
💡 Comfort Fit Adjustment: If your existing ring is a standard flat-fit band (not comfort fit), your Foundoria ring in the same size may feel slightly looser. This is normal—comfort fit rings are designed to slide on and off more easily. If you're between sizes, size down.
Method 3: String or Paper Strip
This method measures your finger circumference directly. While convenient, it requires careful technique for accuracy.
Prepare Your Materials
Cut a thin strip of paper (about 10mm wide and 100mm long) or use a piece of non-stretchy string. You'll also need a pen and a ruler with millimetre markings.
Avoid: Stretchy materials like elastic or yarn—they'll give inaccurate results.
Wrap Around Your Finger
Wrap the paper or string around the base of your ring finger, just below the knuckle. Pull snug but not tight—you should be able to slide it along your finger.
Key: The strip needs to pass over your knuckle when forming a ring, so don't wrap too tightly.
Mark the Overlap
Where the paper or string meets itself, mark clearly with a pen. Unwrap and lay flat.
Measure and Match
Measure from the end to your mark in millimetres. This is your circumference. Find it in the "Circumference" column of the size chart above.
Between sizes? Size down for comfort fit rings.
Tips for an Accurate Measurement
Measure at the Right Time
Measure in the evening when fingers are at their largest. Avoid measuring when very cold (fingers shrink) or after exercise (fingers swell temporarily).
Measure Multiple Times
Take measurements on 2-3 different days at different times. If you get varying results, the most common result is likely your true size.
Consider Your Knuckle
If your knuckle is significantly larger than your finger base, you'll need a size that slips over the knuckle but doesn't spin at the base. A jeweller can help with this.
Remember: Comfort Fit
Foundoria rings are comfort fit, which means they slide on more easily than flat-fit bands. If between sizes, size down rather than up.
Temperature Matters
Fingers can vary by a full size between hot and cold conditions. Choose a size comfortable for your typical daily environment.
Dominant Hand Difference
Your dominant hand's fingers are often slightly larger. Measure the specific finger you plan to wear the ring on.
Common Sizing Mistakes to Avoid
Measuring When Cold
Cold fingers can be up to a full size smaller. Your ring may feel loose on warmer days. Always measure at room temperature.
Using Stretchy String
Elastic, yarn, or stretchy materials will give you an incorrect measurement. Use non-stretch paper or string only.
Wrapping Too Tight
A ring needs to slide over your knuckle. Wrap snugly but not tightly—you should be able to slide the paper along your finger.
Sizing Up "Just in Case"
With comfort fit rings, sizing up often results in a ring that spins or feels loose. If between sizes, size down—you can always exchange if needed.
Measuring the Wrong Finger
Your ring finger sizes can differ between hands. Always measure the exact finger on the hand you'll wear the ring.
Printing at Wrong Scale
If using our printable tools, printing at anything other than 100% scale will give inaccurate results. Always verify the reference measurement after printing.
What If You're Between Sizes?
Consider these factors when deciding:
- Size DOWN if: You prefer a snug fit that won't spin, you're between sizes, your measurements are inconsistent, or you've been sized for flat-fit rings before
- Size UP if: Your knuckle is significantly larger than your finger base, you live in a very warm climate, or your fingers tend to swell noticeably
Still Unsure? We've Got You Covered
We understand sizing can be tricky—especially when you can't try before you buy.
That's why we offer free 30-day returns and exchanges on all orders. If your ring doesn't fit perfectly, simply return it for a different size at no extra cost. No hassle, no questions asked.
We want you to love your ring, and we'll make it easy to get the perfect fit.
Frequently Asked Questions
Ready to Find Your Perfect Fit?
Request your free ring sizer or visit a local jeweller for the most accurate sizing.
