Complete 2026 UK standard ring sizes AโZ+6 ยท Diameter & circumference in mm ยท US, EU, French & Japanese conversions ยท Calculator & expert tips.
Most common women's size in UK. Equivalent to US 6โ6.5 and EU 51โ52. Data from H.Samuel, Serendipity Diamonds and Allure Jewellers research.
Most common men's size in UK. Equivalent to US 9โ9ยพ and EU 60โ61. Data from Hitched, Regal Hatton Garden and Queensmith industry surveys.
| ๐ฌ๐ง UK | โญ Circ. MM | โญ Circ. CM | ๐ Diam. MM | ๐ Diam. CM | ๐บ๐ธ US | ๐ฉ๐ช EU | ๐ซ๐ท French | ๐ฏ๐ต Japan | Range |
|---|
Wrap a paper strip around your ring finger. Mark the overlap. Measure in mm with a ruler. This is your circumference.
Look up your mm reading in the Circ. MM column. If between two sizes, choose the larger one.
Enter mm, cm or inches (diameter or circumference) for an instant UK size + US ยท EU ยท French ยท Japan conversion.
Measure the inner diameter of a well-fitting ring using calipers. Find it in the Diam. MM column to confirm.
Read across the row for your UK size to find the equivalent US, EU, French or Japanese size to order safely.
For engagement and wedding rings, always have your finger measured by a UK jeweller โ it's free and takes 2 minutes.
Measure in the afternoon or evening. Fingers are largest then. Avoid cold mornings or post-exercise โ your reading will be inaccurate.
Always measure the exact finger the ring will be worn on. Your dominant hand ring finger is usually half a size larger than the other hand.
If your measurement falls between two sizes, always choose the larger one. A slightly loose ring is easy to fix โ a tight one isn't.
Bands wider than 6mm feel tighter than their nominal size. Go up half a UK size for 6โ8mm bands, a full size for 10mm+.
Your ring must pass over the knuckle. If your knuckle is significantly wider than your finger base, size to fit the knuckle and use a ring adjuster.
Never assume size names match across countries. A US "Size 7" โ French "Size 7". Always convert using mm or this chart before ordering.