Ring Size Guide: Measure at Home and Avoid Returns
Measure now: a precise at-home method that works
Begin by gathering a thin strip of paper or non-stretch string, a pen, and a millimeter ruler. Use this ring size guide measure at home by wrapping the paper around the base of the finger, marking where the ends meet, then laying the strip flat and measuring the marked length in millimeters. Record the measurement and repeat the process two more times at different times of day to confirm consistency.
Tools that give the most accurate results
- Printable ring sizer: Print at 100 percent scale and check a known coin or ruler against the guide to confirm print accuracy.
- Metal ring sizer: Adjustable, durable, and the easiest at-home tool for repeated checks.
- Plain paper or string and a millimeter ruler: Most accessible method when a sizer is not available.
- Existing ring: Measure inner diameter with calipers or compare to the conversion table below.
How to measure step by step
- Choose the correct finger and hand. Dominant hands are often slightly larger; measure the hand that will wear the ring.
- Measure near the end of the day when fingers are warm. Cold shrinks fingers; heat expands them.
- Wrap the string or paper snugly but not tight. It should glide over the knuckle with gentle pressure.
- Mark the overlap precisely, measure in millimeters, and use the chart to find the closest US size.
- If the measurement falls between sizes, choose the larger size for comfort unless the design is very narrow.
Common fit questions and quick answers
- What about knuckle size? Measure both at the base and over the knuckle. If the knuckle is larger, select a size that slides over the knuckle comfortably and still feels secure at the base.
- Wide bands require a slightly larger size. Add 0.5 to 1 full size for bands wider than 6 mm to avoid tightness.
- Stacking rings: When wearing multiple thin bands together, measure for the combined feel or order one size up for close stacks. See the Stacking rings guide for styling and fit tips.
Conversion chart: circumference and diameter to US sizes
Use the table to convert your measured circumference to a US ring size. Measurements are inner circumference and inner diameter in millimeters.
| US Size | Inner Diameter (mm) | Inner Circumference (mm) |
|---|---|---|
| 3 | 14.1 | 44.2 |
| 3.5 | 14.5 | 45.5 |
| 4 | 14.8 | 46.8 |
| 4.5 | 15.2 | 48.0 |
| 5 | 15.7 | 49.3 |
| 5.5 | 16.1 | 50.6 |
| 6 | 16.5 | 51.8 |
| 6.5 | 16.9 | 53.1 |
| 7 | 17.3 | 54.4 |
| 7.5 | 17.7 | 55.7 |
| 8 | 18.2 | 57.0 |
| 8.5 | 18.6 | 58.3 |
| 9 | 19.0 | 59.5 |
| 9.5 | 19.4 | 60.8 |
| 10 | 19.8 | 62.1 |
| 10.5 | 20.2 | 63.4 |
| 11 | 20.6 | 64.6 |
| 11.5 | 21.0 | 65.9 |
| 12 | 21.4 | 67.2 |
| 13 | 22.2 | 69.7 |
How to use an existing ring to find size
- Pick a ring that fits the intended finger, not one that is loose.
- Measure the inner diameter across the center in millimeters with calipers or a ruler.
- Match that diameter to the table above to find the US size.
Sizing mistakes that lead to exchanges
- Measuring cold fingers. Low temperature reduces finger size by up to one half size.
- Using elastic thread or stretchy material to measure. Only use non-stretch paper or string.
- Measuring too loosely. A ring should slide over the knuckle with mild resistance and sit comfortably at the base of the finger.
- Ignoring ring width. Wider rings feel tighter and often need a larger size.
What to do if you fall between sizes
When between two sizes choose the larger size for daily comfort. For snug-fitting styles or delicate cocktail rings choose the smaller size. If unsure, order two sizes when possible to try both fits before committing.
Resizing and return considerations
Check the seller return and resizing policy before purchase. Many rings can be resized up or down a size or two, but rings with full pavé stones or complex settings may be difficult or expensive to alter. When shopping online browse the Rings collection for clear size notes and available resizing services.
Special cases: knuckles, arthritis, and comfort fit
- Large knuckles: Measure knuckle and base separately. If the knuckle is more than one full size larger than the base, choose a size that clears the knuckle and use a ring guard if the base feels loose.
- Arthritis or swollen fingers: Measure at the time of day when fingers are most comfortable. Consider comfort fit bands with rounded interior profiles for easier on and off motion.
- Comfort fit vs standard fit: Comfort fit bands have a rounded inner edge and may require a half size smaller than a standard flat-band measurement.
Final checks before ordering
- Measure two or three times and average the values.
- Cross-check with an existing ring from the same finger.
- Confirm sizing notes on the product page and refer to the conversion chart above.
Aftercare and care of fit
Once a ring fits, maintain the finish and sizing with proper care. Store rings separately to avoid scratches and clean with recommended methods for the metal type. For specific cleaning or care guides, see posts like How to Clean Jewelry at Home Without Ruining the Finish and How to Store Jewelry So It Does Not Tangle or Tarnish.
Where to go next
If a precise fit matters for a proposal or heirloom purchase, visit a local jeweler for professional measuring and fitting. For everyday purchases, use the steps above and consult product-specific size notes in the Rings collection. When combining multiple bands, revisit the Stacking rings guide for guidance on fit and proportion.