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Secure at the Base
The ring should sit comfortably without a large gap or frequent spinning.
Jewelry Guide
Find Your Ring Size
A well-fitted ring should slide over the knuckle with gentle resistance and sit securely at the base of the finger without pinching or spinning excessively.
Use the visual measurement guide, interactive calculator and international conversion chart below to estimate your size before ordering.
The Right Fit
How Should a Ring Fit?
The correct size should feel secure without restricting the finger.
Gentle Knuckle Resistance
It should pass over the knuckle with slight resistance rather than slipping off easily.
No Pain or Deep Mark
The band should not pinch, restrict circulation or leave a deep indentation.
Most accurate option:
Have the intended finger measured by a professional jeweler using physical sizing rings,
especially for an engagement ring or a design that may be difficult to resize.
Three Measurement Methods
How to Measure Your Ring Size
Use the most accurate method available and repeat home measurements before selecting a size.
MOST ACCURATE
Visit a Jeweler
A jeweler can account for your knuckle, finger shape and intended band width.
- Measure the exact finger and hand.
- Try nearby sizes, not one size only.
- Use a wide-band gauge for a wide ring.
GOOD HOME METHOD
Measure an Existing Ring
Choose a round ring that already fits the same finger on the same hand.
- Place the ring flat on a ruler.
- Measure the inside diameter in millimeters.
- Enter the result in the calculator below.
APPROXIMATE METHOD
Use a Non-Stretch Paper Strip
This is only an estimate because placement and tension can change the result.
- Wrap a narrow strip around the finger base.
- Mark where the ends meet without pulling tightly.
- Measure the marked length in millimeters.
Avoid stretchy string or floss.
Stretching, twisting or pulling too tightly can produce an inaccurate measurement.
Interactive Tool
Ring Size Calculator
Enter either finger circumference or the inside diameter of a ring that already fits.
mm
Example: 53.1 mm circumference or 16.9 mm diameter
Estimated U.S. / Canada size
6.5
This is an estimate. Confirm the final size with a jeweler, especially for wide bands, eternity rings or designs with limited resizing options.
Visual Comparison
Ring Size Progression Graph
This graph shows how inside diameter increases across selected U.S./Canada sizes.
Size 4
14.9 mm
Size 6
16.5 mm
Size 8
18.1 mm
Size 10
19.8 mm
Size 12
21.4 mm
The bars show relative progression only. They are not printable physical ring templates.
International Conversion
Ring Size Chart
Match the inside diameter or circumference to the nearest size. Small differences between manufacturers and systems can occur.
| U.S. / Canada | U.K. / Australia | Inside Diameter | Inside Circumference |
|---|
Use the chart as a conversion guide rather than a substitute for trying a physical sizing ring.
Improve Accuracy
Ring Measurement Tips
Measure the Correct Finger
Finger size can differ between hands. Measure the exact finger and hand.
Measure More Than Once
Repeat the measurement two or three times and compare the results.
Avoid Extreme Temperatures
Cold can make fingers smaller; heat and exercise can make them swell.
Consider the Knuckle
The ring must pass over the knuckle while remaining secure at the base.
Account for Band Width
Wide bands and stacked rings usually fit more snugly than thin bands.
Do Not Use Average Size
General averages cannot determine an individual's accurate ring size.
Planning a Surprise
How to Find a Partner's Ring Size
The safest surprise method is to borrow a ring they wear on the intended ring finger and have a jeweler measure it.
01
Borrow a round ring that fits the same finger on the same hand.
02
Ask a trusted friend or family member who may already know the size.
03
Trace the inside edge of a well-fitting ring and take the tracing to a jeweler.
04
Confirm that the selected ring design can be resized after the proposal.
Rings worn on the middle finger, index finger or opposite hand may not provide the correct size.
Design Considerations
Band Width and Resizing
WIDE BANDS
They Usually Feel More Snug
A wide band covers more of the finger and may require a slightly larger size than a thin band.
Bridal sets and stacked bands should be measured together whenever possible.
RESIZING LIMITATIONS
Some Designs Are Harder to Change
Full-eternity, pavé-heavy, channel-set, engraved, mixed-metal and tension-style rings may have limited resizing options.
Confirm the available resizing range before ordering.
Frequently Asked Questions
Ring Size FAQs
What is the most accurate way to find ring size?+
Have the intended finger measured by a professional jeweler using physical sizing rings that match the approximate width of the ring you plan to buy.
Should a ring be tight or loose?+
It should feel snug and secure, pass over the knuckle with gentle resistance and remain comfortable without restricting the finger.
Can I measure ring size with an existing ring?+
Yes. Measure the inside diameter of a round ring that fits the same finger on the same hand, then compare it with the chart.
Is a paper-strip measurement accurate?+
It can provide an estimate, but placement, tension, moisture and knuckle size can affect the result. Repeat it and confirm with a jeweler.
Why does my ring size change during the day?+
Temperature, exercise, fluid retention, humidity and other temporary factors can make fingers swell or shrink.
What should I do if I am between sizes?+
Try both sizes using a physical sizer. The better choice depends on knuckle size, finger shape, band width and whether the ring is top-heavy.
Do wide bands require a larger size?+
They often fit more snugly than thin bands. Use a wide-band sizing gauge or ask the jeweler to account for the intended width.
Are ring sizes the same in every country?+
No. The U.S. and Canada use numbers, the U.K. and Australia commonly use letters, and India and other regions use different numerical systems.
Can every engagement ring be resized?+
No. Resizing depends on the metal and design. Eternity, full pavé, channel-set, tension-style and highly detailed rings may be difficult to resize.
Choose a Ring That Fits With Confidence
Measure carefully, compare the chart and confirm the final size before ordering.
