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πŸ’ Ring Size Conversion Chart 2026

Convert ring sizes between US, UK, EU, Australian, Japanese & more β€” plus mm/inches

Select any size β€” all other fields update automatically

πŸ“ Measurements

πŸ’‘ Tip: For best results, measure your finger at room temperature, at the end of the day when fingers are largest.

How to Measure Your Ring Size

πŸ“ String Method

  1. Wrap string/paper around your finger
  2. Mark where ends meet
  3. Measure length in mm
  4. Enter as circumference above

πŸ’ Existing Ring

  1. Find a ring that fits well
  2. Measure inner diameter in mm
  3. Enter diameter above
  4. All sizes auto-calculate

πŸ“ Ruler Method

  1. Print ring sizer at 100%
  2. Place ring on circles
  3. Find matching circle
  4. Read your size

International Ring Size Chart

US/CA UK/AU EU JP FR DE CH Ø mm Ø inch Circ mm

Frequently Asked Questions

What is US ring size 6 in EU?
US size 6 = EU size 51.5-52. The diameter is 16.5mm (0.65 inches) with circumference of 51.8mm. This is a common women's ring size.
What is ring size 52 in US?
EU ring size 52 = US size 6. It has a 16.5mm diameter. This is one of the most popular ring sizes for women worldwide.
What is ring size 54 in US?
EU ring size 54 = US size 7. The diameter is 17.3mm (0.68 inches). Size 7 is the average women's ring size in the United States.
What is ring size 56 in US?
EU ring size 56 = US size 7.5-8. Diameter is approximately 17.8-18mm. This size works for both larger women's sizes and smaller men's sizes.
How do I convert UK ring size to US?
UK/Australian ring sizes use letters (A-Z). Size I (UK) = 4.5 (US), Size M = 6 (US), Size Q = 8 (US). UK sizes are also used in Ireland, South Africa, and New Zealand.
What is UK ring size I in US?
UK size I = US size 4.5. The diameter is 15.3mm. This is a smaller ring size, common for pinky rings or petite fingers.
What is UK ring size M in US?
UK size M = US size 6. This equals EU 51.5-52 with 16.5mm diameter. M is one of the most common women's sizes in the UK.
How do European ring sizes work?
European (EU) ring sizes equal the inner circumference in mm. Size 52 means 52mm circumference. To find EU size: measure circumference or multiply diameter by Ο€ (3.14).
What are Pandora ring sizes?
Pandora uses EU sizing (circumference in mm). Common Pandora sizes: 48 (US 4.5), 50 (US 5), 52 (US 6), 54 (US 7), 56 (US 8). Check jewelry box for current size.
How do I convert ring size letters to numbers?
UK letters to US numbers: A=0.5, F=3, I=4.5, L=5.5, M=6, O=7, Q=8, T=9.5, V=10.5, Z=12.5. Each half UK size β‰ˆ 0.5 US size.
How do I measure ring size in cm or mm?
Measure the inner diameter of a well-fitting ring in mm. Common sizes: 15mm (US 4), 16.5mm (US 6), 18mm (US 8), 20mm (US 10). Multiply by 3.14 for circumference.
What is the average ring size?
Women: US 6-7 (EU 52-54, 16.5-17.3mm). Men: US 9-10 (EU 60-62, 19-20mm). Sizes vary by country, age, and body type.
How do Japanese ring sizes work?
Japanese sizes are numbered 1-30. Size 1 = 13mm diameter. Each size adds ~0.33mm. JP 9 = US 5, JP 13 = US 7, JP 18 = US 9.
Should I size up or down between sizes?
If between sizes, choose larger for wide bands (4mm+), engagement rings. Choose smaller for thin bands. Rings should slide on with slight resistance.
Do fingers change size?
Yes! Fingers swell in heat, humidity, pregnancy, morning. They shrink in cold, after exercise. Measure multiple times at different conditions for best accuracy.
How accurate is ring size conversion?
Conversions are approximateβ€”manufacturers may vary Β±0.5 size. This chart uses ISO 8653 standard. For expensive rings, get professionally sized at a jeweler.
What is a French ring size?
French sizes = circumference in mm (same as EU). Also used in Belgium, Spain, Netherlands. Size 52 (French) = 52mm circumference = US 6.