Measure ring size at homeTape measure method
How to measure ring size at home with tape measure
Wrap a flexible tape measure around the base of your finger, read the circumference, then convert that measurement into a recommended buying size.
Calibrate your screen
Place a real bank card on your screen. Align its top-left corner with the virtual card, then use the slider until the virtual card's left vertical edge matches exactly.
Standard bank card short edge: 53.98 mm. No camera, no upload, no card number needed.
Measure finger circumference
Wrap paper or string around the finger base, mark the overlap, then lay it straight on the ruler and drag the marker so the red line meets the end.
If your measurement falls between two sizes, choose the larger size. For wide bands or fingers that swell easily, choose a slightly larger size.
Quick answer: How to measure ring size at home with tape measure
The easiest tape method is to read the inside circumference directly in millimeters. If your tape uses inches, convert inches to millimeters before using the chart.
- Wrap the tape measure around the finger base, not the knuckle.
- Keep the tape snug but comfortable.
- Read the measurement in millimeters, or convert inches to millimeters.
Tape measure ring size calculator
Enter the tape reading as circumference in millimeters, centimeters, or inches.
If your measurement falls between two sizes, choose the larger size.
How to measure your finger
Keep the tape flat, level, and snug around the finger base.
Tape measure
Wrap the tape measure around the finger base, not the knuckle.
Wrap and mark
Keep the tape snug but comfortable.
Choose the larger row
Use the larger listed size when the measurement falls between two chart rows.
Step-by-step tape measure method
Use a soft tailor tape rather than a stiff construction tape. Let the tape touch the skin without pressing into it, then read the point where the tape overlaps.
Tape measure to ring size chart
A tape reading is a circumference measurement. Match that circumference to the chart row and use the recommended US / CA, ISO / EU, UK / AU, JP / CN, IT / ES / CH, or RU value.
Inches vs mm conversion
If the tape reads inches, multiply by 25.4. For example, 2.14 inches is about 54.4 mm, which maps to the US 7 purchase row.
When a tape measure is not accurate
A wide or stiff tape can add extra length. Measure twice, keep the tape level, and avoid measuring when your hands are cold.
Ring size chart for this method
This table shows common conversion rows. If your measurement sits between two rows, use the larger recommended size for purchase.
| Circumference mm | Diameter mm | ISO / EU | US / CA | UK / AU | JP / CN | IT / ES / CH | RU |
|---|---|---|---|---|---|---|---|
| 44.2 | 14.1 | 44 | 3 | F | 4 | 4 | 14 |
| 45.5 | 14.5 | 46 | 3.5 | G | 5 | 5¼ | 14.5 |
| 46.8 | 14.9 | 47 | 4 | H | 7 | 6½ | 15 |
| 48.0 | 15.3 | 48 | 4.5 | I | 8 | 7¾ | 15.25 |
| 49.3 | 15.7 | 49 | 5 | J½ | 9 | 9 | 15.75 |
| 50.6 | 16.1 | 50.5 | 5.5 | K½ | 10 | 10¼ | 16.25 |
| 51.9 | 16.5 | 52 | 6 | L½ | 12 | 11½ | 16.5 |
| 53.1 | 16.9 | 53 | 6.5 | M½ | 13 | 12¾ | 17 |
| 54.4 | 17.3 | 54.5 | 7 | N½ | 14 | 14 | 17.25 |
| 55.7 | 17.7 | 56 | 7.5 | O½ | 15 | 15¼ | 17.75 |
| 57.0 | 18.1 | 57 | 8 | P½ | 16 | 16½ | - |
| 58.3 | 18.6 | 58.5 | 8.5 | Q½ | 17 | 17¾ | 18.5 |
| 59.5 | 18.9 | 60 | 9 | R½ | 18 | 19 | 19 |
| 60.8 | 19.4 | 61 | 9.5 | S½ | 19 | 20¼ | 19.5 |
| 62.1 | 19.8 | 62 | 10 | T½ | 20 | 21½ | 19.75 |
| 63.4 | 20.2 | 63.5 | 10.5 | U½ | 22 | 22¾ | - |
| 64.6 | 20.6 | 65 | 11 | V½ | 23 | 24 | 20.75 |
| 65.9 | 21.0 | 66 | 11.5 | W½ | 24 | 25¼ | 21 |
| 67.2 | 21.4 | 67.5 | 12 | X½ | 25 | 26½ | 21.5 |
| 68.5 | 21.8 | 69 | 12.5 | Z | 26 | 27¾ | 21.75 |
| 69.7 | 22.2 | 70 | 13 | - | 27 | 29 | 22 |
Conversion examples
| Input | Millimeters | Recommendation |
|---|---|---|
| 2.14 in | 54.4 mm | US 7 / EU 54.5 |
| 2.24 in | 57.0 mm | US 8 / EU 57 |
| 2.39 in | 60.8 mm | US 9.5 / EU 61 |
FAQ
Can I use a regular tape measure for ring size?
A flexible tailor tape works well. A rigid tape measure is harder to wrap around the finger and can give a loose reading.
What if my tape measure only shows inches?
Use the calculator on this page and choose circumference inches, or multiply the inch reading by 25.4 to get millimeters.
Should I size up if I am between two ring sizes?
Yes. For online buying, choose the larger listed size when your measurement falls between two rows. A ring that is slightly loose is easier to adjust than one that will not pass the knuckle.
Is circumference or diameter better for ring sizing?
Circumference is safer for measuring a finger at home. Diameter is useful when measuring an existing ring, but it should be converted back to circumference before choosing a purchase size.
When should I measure my finger?
Measure near the end of the day at normal body temperature. Cold hands can shrink and hot weather can make fingers swell.