You don’t need a jeweler to get your ring size close enough to order. Here are three methods, from most to least accurate.
Method 1: measure a ring you already own (most accurate)
- Pick a ring that fits the finger you’re buying for.
- Measure the inside diameter across the widest point, in millimetres, with a ruler.
- Match it to the chart below.
Method 2: paper or string strip
- Cut a thin strip of paper or a length of string.
- Wrap it snugly around the base of your finger — not tight, not loose.
- Mark where it overlaps, then measure that length in millimetres. That’s your circumference.
- Match it to the chart.
US ring size reference
| US size | Inside diameter | Circumference |
|---|---|---|
| 5 | 15.7 mm | 49.3 mm |
| 6 | 16.5 mm | 51.9 mm |
| 7 | 17.3 mm | 54.4 mm |
| 8 | 18.2 mm | 57.0 mm |
| 9 | 19.0 mm | 59.5 mm |
| 10 | 19.8 mm | 62.1 mm |
| 11 | 20.6 mm | 64.6 mm |
| 12 | 21.4 mm | 67.2 mm |
| 13 | 22.2 mm | 69.7 mm |
Tips for an accurate result
- Measure at the end of the day, when fingers are largest.
- Don’t measure when your hands are cold — fingers shrink.
- If you’re between sizes, size up — especially for a wide band.
- Wide bands (6 mm+) fit tighter than thin ones; consider a quarter size up.
- If your knuckle is much larger than the base of the finger, size to slide over the knuckle.
Buying a surprise gift?
Borrow a ring they currently wear on the correct hand and measure its inside diameter. If you can only get a rough idea, most women’s rings fall around US 6–7 and most men’s around US 9–11.
Papa Jewels rings can be ordered in your size — browse men’s diamond rings, gold CZ rings and women’s bridal sets. Questions on sizing? Contact us — we’re available 24/7.