Fit Guide
Ring Size Guide
A ring that fits well feels like it was always yours. Here is how to find your size at home, a full international size chart, discreet ways to find a partner's size for a surprise, and what happens if the fit is not quite right.
Updated October 2026 · 6 minute read
- Free
- Resizing within 15 days
- ± 3.5
- Sizes adjusted
- 1 year
- Resizing available
- 3 – 13
- US sizes in our chart
01Peace of mind
Our perfect-fit promise
Every Civia ring is made to order in the size you choose, and if the fit is not quite right, we will adjust it.
- Free resizing within 15 days of delivery, up to 3.5 sizes up or down.
- From day 16 to one year after delivery, resizing is available for 15% of the purchase price.
- Larger changes (more than 3.5 sizes, or after the first year) are quoted once our jewellers have checked the design.
- Eternity bands, with diamonds all the way around, cannot be resized; contact us and we will advise on the options for your piece.
Shipping charges apply to resizing, and every resize is arranged with our team first: contact support@civiajewels.com or +1 (437) 422-1187.
02Do it yourself
Measure your ring size at home
The most accurate size always comes from a jeweller's ring sizer, but you can get a reliable result at home in two minutes with either method below.
Method 1: measure your finger
- Wrap.Wrap a thin strip of paper or non-stretchy string around the base of the finger the ring is for.
- Mark.Mark where the end meets the strip. It should be snug but still slide over your knuckle.
- Measure.Lay it flat and measure from the start to the mark in millimetres. This is your circumference.
- Match.Find the nearest circumference in the chart below. If you are between two sizes, choose the larger.
Method 2: measure a ring that fits
- Choose a ring.Use a ring that fits the intended finger well. Make sure it is round, not bent.
- Measure the inside.Measure straight across the inside of the ring, edge to edge, in millimetres. This is the inner diameter.
- Match.Find the nearest inner diameter in the chart below.
03Size chart
International ring size chart
Use the inner diameter of a ring, or the circumference of your finger, to find your size in every system. Civia rings are sized in US sizes, which are the same in Canada.
| US & Canada | Inner diameter (mm) | Circumference (mm) | UK & Australia | Europe (ISO) |
|---|---|---|---|---|
| 3 | 14.1 | 44.2 | F | 44 |
| 3.5 | 14.5 | 45.5 | G | 45.5 |
| 4 | 14.9 | 46.8 | H | 47 |
| 4.5 | 15.3 | 48.0 | I | 48 |
| 5 | 15.7 | 49.3 | J½ | 49 |
| 5.5 | 16.1 | 50.6 | K½ | 50.5 |
| 6 | 16.5 | 51.9 | L½ | 52 |
| 6.5 | 16.9 | 53.1 | M½ | 53 |
| 7 | 17.3 | 54.4 | N½ | 54.5 |
| 7.5 | 17.7 | 55.7 | O½ | 56 |
| 8 | 18.1 | 57.0 | P½ | 57 |
| 8.5 | 18.5 | 58.3 | Q½ | 58 |
| 9 | 18.9 | 59.5 | R½ | 59.5 |
| 9.5 | 19.4 | 60.8 | S½ | 61 |
| 10 | 19.8 | 62.1 | T½ | 62 |
| 10.5 | 20.2 | 63.4 | U½ | 63.5 |
| 11 | 20.6 | 64.6 | V½ | 65 |
| 11.5 | 21.0 | 65.9 | W½ | 66 |
| 12 | 21.4 | 67.2 | Y | 67 |
| 12.5 | 21.8 | 68.5 | Z | 68.5 |
| 13 | 22.2 | 69.7 | Z+1 | 70 |
Measurements are approximate and rounded to 0.1 mm. Average women's sizes are 5–7; average men's sizes are 8–11.
04For a surprise
Find a partner's size in secret
Most proposals are a surprise. These discreet methods work well, and our resizing promise means you can propose with confidence even if you are a little off.
05Good to know
Tips for the most accurate fit
Fingers change size through the day and with temperature. These small habits make a big difference.
06Questions
Questions about ring size
What if I order the wrong size?
Resizing up to 3.5 sizes up or down is free within 15 days of delivery. From day 16 up to one year, resizing costs 15% of the purchase price. Shipping charges apply. Contact us first to arrange it.
Should I size up or down if I am between sizes?
Choose the larger size. A ring that is slightly loose is comfortable and easy to adjust; one that is too tight may not pass the knuckle.
Can every ring be resized?
Most rings can. Eternity bands, with diamonds set all the way around, cannot be resized because the stones would need to be reset. Contact us and we will advise on the options for your piece.
What is the most common engagement ring size?
In the USA and Canada most women wear between size 5 and 7, with 6 to 6.5 the most common. Most men wear between size 8 and 11.
Are US and Canadian ring sizes the same?
Yes. Canada uses the same numbered sizes as the USA. Use the chart above to convert from UK, Australian or European sizes.
Do wider bands need a bigger size?
Often, yes. Bands wider than about 4 mm cover more of the finger and feel tighter, so many people go up a quarter to half a size.
Can you help me find my size?
Yes. Send us a photo of your measurement or the ring you are comparing with, and we will help you choose. Contact us at support@civiajewels.com or +1 (437) 422-1187.
