Ring Size Calculator

How to Use This Calculator

1. Wrap a strip of paper around your finger just below the knuckle.
2. Mark the overlap point, remove and measure the paper length in mm — this is your circumference.
3. Enter this number into the calculator to see your US, UK, EU, and JP ring sizes instantly.
4. Use the Professional tab for band width and timing adjustments.

Formula

Example

Frequently Asked Questions

• How do I measure my ring size at home? ▼
  Wrap a thin strip of paper around your finger, mark where it overlaps, and measure the length in mm. That is your finger circumference. Enter it into this calculator to get your ring size.
• What is the average ring size for women and men? ▼
  The average women's ring size in the US is 6-6.5. The average men's ring size is 9-10. Finger size varies significantly by person, so always measure before buying.
• Should I size up for a wide ring band? ▼
  Yes. For bands wider than 6mm, size up 0.5. For bands wider than 12mm, size up 1 full size. Wider bands grip more finger surface and feel tighter.
• When is the best time to measure ring size? ▼
  Measure in the afternoon or evening when fingers are at their largest. Avoid measuring when cold (fingers shrink) or after exercise or heat exposure (fingers swell). Remeasure if unsure.
• Does my dominant hand need a different ring size? ▼
  Yes — your dominant hand fingers are typically 0.5 sizes larger than your non-dominant hand. If buying a ring for your right hand (dominant) and measuring your left hand, add 0.5.

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