If you’re buying a ring from a different country, one of the most common questions is:
“What is a size 8 ring in the UK?”
Ring sizes vary internationally, and the US and UK use completely different labeling systems.
This guide explains the exact UK size equivalent, includes measurement charts, and helps you find the perfect fit—especially when ordering rings online.
US Size 8 = UK Size P ½
The UK equivalent of a US size 8 ring is UK size P ½.
US Size 8 Measurements
- Inside Diameter: 18.2 mm
- Inside Circumference: 57.2 mm
- UK Equivalent: P ½
Quick Conversion Table
| US Size | UK Size | Diameter (mm) | Circumference (mm) |
| 7 | O | 17.3 mm | 54.4 mm |
| 8 | P ½ | 18.2 mm | 57.2 mm |
| 9 | R | 18.9 mm | 59.5 mm |
💡 Good to know:
Most women fall between US size 6–7, so size 8 is considered slightly larger than average but still very common.
Why Ring Size Conversions Matter
Different countries use different sizing standards:
- US/Canada: Numbers (e.g., 6, 7, 8, 9)
- UK/Australia: Letters (e.g., L, M, O, P ½)
- Europe: Circumference in mm
- Asia: Numeric scale based on diameter
If you order a ring without converting properly, it may end up too tight or too loose.
That’s why it’s important to understand your exact UK size if you’re buying from a UK-based jeweler like Pandora, H. Samuel, or Beaverbrooks.
How to Confirm If Size P ½ Fits You
✔ 1. Measure Your Finger With a Fabric Tape
Wrap around your finger base.
If it measures 57.2 mm, you’re a US 8 / UK P ½.
Guide:
👉 How to Measure Ring Size With a Fabric Tape
✔ 2. Use a Printable Ring Sizer
Print, cut, measure, and compare.
Guide:
👉 How to Use a Printable Ring Sizer
✔ 3. Try Plastic Ring Sizing Rings
Most accurate method for home sizing.
Guide:
👉 Understanding Plastic Sizing Rings for Jewelry
Is UK Size P ½ Big for Women?
- Slightly above average, but very common
- Most women fall between M–O (US 6–7)
- P ½ is perfect for women with wider fingers or larger knuckles
For comparison:
👉 Is Size 8 Big for a Woman’s Ring Finger?
Can a Size P ½ (US 8) Ring Be Resized?
Yes! Most rings can be resized 1–2 sizes up or down depending on the metal.
Helpful guides:
FAQs
1. What is US size 8 in UK ring size?
UK P ½.
2. What is the diameter of a size 8 ring?
18.2 mm.
3. Is UK size P ½ big for women?
Slightly above average, but very common.
4. Is size 8 considered medium?
For women, it’s medium-large.
5. What is size 8 in EU sizing?
EU 57.
Conclusion
A US size 8 ring converts to a UK size P ½, with an 18.2 mm diameter and a 57.2 mm circumference.
This makes it slightly larger than average for women, but still one of the most popular sizes.
To ensure a perfect fit, always confirm your size using accurate tools or a conversion chart.
👉 Calculate your exact ring size here:
https://ringsizechartcalculator.com/
