Find your ring size by measuring your finger or using an existing ring and convert below.
View our comprehensive guide.
How to Measure Your Ring's Inner Diameter
- Gather Your Tools: Use a digital caliper for the most accurate measurement. If you don’t have one, a clear ruler and a steady hand can work too.
- Place Your Ring on a Flat Surface: Ensure your ring is on a stable, flat surface for an accurate reading.
- Measure the Inner Diameter: Gently close the caliper’s jaws until they just touch the inner edges of the ring. Read the measurement in millimeters (mm).
- Double-Check Your Measurement: Repeat the process a few times to ensure accuracy.
The inner diameter is key for converting to a US ring size.
How to Measure Your Ring's Inside Circumference
- Tools Needed: A flexible measuring tape or a strip of paper and a ruler.
- Wrap the Tape or Paper: Wrap it snugly inside the ring without forcing it.
- Measure the Length: Use a ruler to measure the length in millimeters (mm).
Ensure you measure inside circumference of the ring, not the outside circumference.
How to Measure Your Finger
- Cut a Piece of String: Take a small piece of string (which is generally more accurate) or a thin strip of paper that’s long enough to wrap around your finger.
- Wrap It Around Your Finger: Wrap the string around the base of your finger where you plan to wear your ring. Ensure it’s snug but not too tight.
- Mark the Spot: Use a pen or marker to mark where the string meets its starting point.
- Measure the String: Lay the string flat and measure its length in millimeters (mm). This is your finger’s circumference.
- Convert Your Measurement: Use the ring sizing chart below or the conversion tool above to determine your US ring size.
The string method is quick and cost-effective. For maximum accuracy, consider professional sizing.
Ring Size Conversion Chart (US 3–13)
| US |
Inside Diameter (mm) |
Inside
Circumference
(mm) |
UK / AUS / NZ |
EU |
Hong Kong |
| 3 | ~14.1 | ~44.14 | F | 44 | 5½ |
| 3.5 | ~14.4 | ~45.4 | G 1/4 | 45 | 6 |
| 4 | ~14.8 | ~46.68 | H 1/2 | 46 | 7 |
| 4.5 | ~15.2 | ~47.97 | I 1/2 | 48 | 8 |
| 5 | ~15.6 | ~49.32 | J 1/2 | 49 | 9 |
| 5.5 | ~16.0 | ~50.58 | L | 50 | 10 |
| 6 | ~16.4 | ~51.87 | M | 52 | 12 |
| 6.5 | ~16.9 | ~53.16 | N | 53 | 13 |
| 7 | ~17.3 | ~54.51 | O | 54 | 14 |
| 7.5 | ~17.7 | ~55.76 | P | 56 | 15 |
| 8 | ~18.1 | ~57.15 | Q | 57 | 16 |
| 8.5 | ~18.5 | ~58.21 | Q 3/4 | 58 | 17 |
| 9 | ~18.9 | ~59.34 | R 3/4 | 60 | 18 |
| 9.5 | ~19.4 | ~60.98 | S 3/4 | 61 | 19 |
| 10 | ~19.8 | ~62.33 | T 1/2 | 62 | 20 |
| 10.5 | ~20.2 | ~63.46 | U 1/2 | 64 | 22 |
| 11 | ~20.6 | ~64.97 | V 1/2 | 65 | 23 |
| 11.5 | ~21.0 | ~66.22 | W 3/4 | 66 | 24 |
| 12 | ~21.4 | ~67.51 | Y | 67 | 25 |
| 12.5 | ~21.8 | ~68.77 | Z | 68 | 26 |
| 13 | ~22.2 | ~70.15 | Z+1 | 70 | 27 |
