Cart
0
Ring Size Conversion Chart: Find Your Perfect Fit
Getting the right ring size is essential, whether you're buying an engagement ring, wedding band, or a gift. A ring that's too tight is uncomfortable; one that's too loose risks falling off and getting lost.
This guide provides a complete ring size conversion chart for US, UK, European, and international sizes, plus simple methods to measure your ring size at home.
Ring Size Conversion Chart
Use this chart to convert between US, UK, EU, and other international ring sizes
Women's Ring Sizes
| US Size | UK Size | EU Size | Inside Diameter (mm) | Inside Circumference (mm) |
|---|---|---|---|---|
| 4 | H | 46.5 | 14.9 | 46.8 |
| 4.5 | I | 47.8 | 15.3 | 48.0 |
| 5 | J | 49 | 15.7 | 49.3 |
| 5.5 | K | 50.3 | 16.1 | 50.6 |
| 6 | L | 51.5 | 16.5 | 51.8 |
| 6.5 | M | 52.8 | 16.9 | 53.1 |
| 7 | N | 54 | 17.3 | 54.4 |
| 7.5 | O | 55.3 | 17.7 | 55.6 |
| 8 | P | 56.6 | 18.1 | 56.9 |
| 8.5 | Q | 57.8 | 18.5 | 58.1 |
| 9 | R | 59 | 18.9 | 59.5 |
Men's Ring Sizes
| US Size | UK Size | EU Size | Inside Diameter (mm) | Inside Circumference (mm) |
|---|---|---|---|---|
| 8 | P | 56.6 | 18.1 | 56.9 |
| 8.5 | Q | 57.8 | 18.5 | 58.1 |
| 9 | R | 59 | 18.9 | 59.5 |
| 9.5 | S | 60.3 | 19.2 | 60.3 |
| 10 | T | 61.6 | 19.8 | 62.2 |
| 10.5 | U | 62.8 | 20.2 | 63.5 |
| 11 | V | 64.1 | 20.6 | 64.8 |
How to Measure Your Ring Size at Home
Method 1: Measure an Existing Ring
The most accurate method if you have a ring that fits well.
Steps:
Choose a ring that fits the correct finger comfortably
Place the ring on a ruler
Measure the inside diameter in millimeters
Match the measurement to the chart above
Pro tip: Make sure to measure a ring worn on the same finger you're sizing for - each finger is different.
Method 2: The String / Paper Method
Use a string, dental floss, or a thin strip of paper.
Steps:
Wrap the string around the base of your fingerMark where the string overlaps
Lay the string flat and measure the length in millimeters
This gives you the circumference — match it to the chart above.
Example: If the string measures 54mm, your US size is approximately 7.
Method 3: Printable Ring Sizer
Many jewelers offer free printable ring sizers online.
Steps:
Print the sizer at 100% scale (do not resize)Cut out the measuring tool
Follow the instructions provided
Verify accuracy by measuring something of known size first
Method 4: Visit a Jeweler
For the most accurate measurement, visit a local jeweler. They have professional sizing tools and can measure your exact size in minutes, usually for free.
Tips for Accurate Sizing
Timing Matters
Your finger size changes throughout the day:
Measure at the end of the day when fingers are largest
Avoid measuring when cold: fingers shrink in cold temperatures
Avoid measuring after exercise, as fingers swell temporarily
Consider the Ring Width
Wider rings fit tighter than narrow rings:
Narrow bands (2-4mm): Standard size
Medium bands (5-6mm): Standard size or half-size up
Wide bands (7mm+): Go up a half-size or full size
Account for Knuckle Size
If your knuckle is larger than your finger base:
Choose a size that fits over the knuckle
The ring may feel slightly loose at the base. This is normal
Consider comfort fit bands, which slide over knuckles more easily
Temperature and Conditions
Hot weather and humidity cause fingers to swell
Cold weather and air conditioning cause fingers to shrink
Measure under "normal" conditions for the best result
Comfort Fit vs. Standard Fit
Ring fit style affects sizing:
Comfort Fit
Interior is slightly domed/rounded
Slides over knuckles more easily
May require a quarter-size smaller than standard fit
Recommended for most people
Standard Fit
Flat interior
Fits more snugly
Traditional sizing applies
Most modern rings, especially men's bands, come in comfort fit.
Resizing Considerations
Rings That Can Be Resized
Gold (yellow, white, rose)Platinum
Silver
Typical resize range: 1–2 sizes up or down
Rings That Cannot Be Resized
TungstenTitanium
Ceramic
Full eternity bands (diamonds all around)
Important: If you choose tungsten or titanium, get sized accurately — you'll need a new ring if your size changes.
When to Consider Resizing
-
Ring spins freely or slides off easily → Too large
Ring leaves an indentation or is hard to remove → Too small
Ring fits over knuckle but is loose at base → Likely correct; consider sizing beads
Common Sizing Scenarios
Buying an Engagement Ring (Surprise)
Options:
-
Borrow a ring she wears on her left ring finger
Ask her friends or family
Use the string method while she sleeps
Start with an average size (6) and resize after the proposal
When in doubt: Size up slightly — it's easier to resize down.
Buying Online
-
Use multiple measuring methods to confirm
Check the retailer's size policy before purchasing
Order a free ring sizer if available
Buying for Someone Else
-
Get their exact size if possible
Check if the ring can be resized
Keep receipts and confirm return/exchange policies
Frequently Asked Questions
What is the average ring size for a woman?
In the US, the average women's ring size is 6. Most women wear sizes between 5 and 7. Petite women often wear sizes 4-5, while those with larger hands may wear 7-8 or above.
What is the average ring size for a men?
Should I size up or down if I'm between sizes?
Size up if:
- You live in a warm climate
- Your knuckles are larger than your finger base
- You're choosing a wide band
Size down if:
- You live in a cold climate
- You prefer a snug fit
- You're choosing a comfort fit ring
Do fingers change size over time?
Yes. Fingers can change due to:
- Weight changes
- Pregnancy
- Aging
- Temperature and climate
- Medical conditions
This is why resizable metals (gold, platinum) are often preferred for wedding bands.
How tight should a ring fit?
A properly fitting ring should:
- Slide over your knuckle with slight resistance
- Sit comfortably at the base of your finger
- Not spin freely (unless it's a plain band)
- Come off with gentle pulling and twisting
What if my partner's ring doesn't fit after the proposal?
Most jewelers offer complimentary resizing within a certain period (typically 30-60 days). Confirm the resize policy before purchasing, and schedule resizing promptly after the proposal.
