Discover timeless elegance with this exquisite cushion cut pink sapphire halo ring, a perfect blend of royal color and brilliant sparkle. The centerpiece features a stunning cushion cut pink sapphire in a rich, vibrant pink hue that captures light beautifully from every angle. Crafted...
Discover timeless elegance with this exquisite round emerald halo ring, a perfect blend of royal color and brilliant sparkle. The centerpiece features a stunning round-cut amethyst in a rich, vibrant green hue that captures light beautifully from every angle. Crafted in lustrous sterling silver...
Discover timeless elegance with this exquisite cushion cut fire opal halo ring, a perfect blend of royal color and brilliant sparkle. The centerpiece features a stunning cushion cut fire opal in a rich, vibrant orange hue that captures light beautifully from every angle. Crafted...
Enter any measurement — diameter, circumference, US size, or UK size — and instantly see your equivalent in every international sizing system.
Convert from Inner Diameter
Measure the inside width of a ring that already fits you — straight across the inside opening — using a ruler or digital calipers. Enter the measurement in millimetres below.
mm
Please enter a diameter between 12 mm and 26 mm.
Convert from Circumference
Wrap a strip of paper around the base of your finger, mark where it overlaps, then measure the marked length in millimetres. Enter that number below.
mm
Please enter a circumference between 38 mm and 84 mm.
Convert from US Size
Enter your US ring size number below. Half sizes (e.g. 6.5) are supported. The converter will show your exact equivalent in all other international systems.
US
Please enter a US size between 3 and 13.5.
Convert from UK Letter Size
Select your UK letter size from the dropdown. UK sizes are used in the United Kingdom, Australia, New Zealand, and South Africa.
Please select a UK size from the list.
Convert from EU / French Size
The EU size is the inner circumference of the ring in millimetres. Common EU sizes range from 44 to 71. Enter your EU size number below.
EU
Please enter an EU size between 44 and 71.
Your Ring Size — All Systems
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Sizes shown are the closest match from our chart. If you are between sizes, always choose the larger size for comfort.
Where your size falls — US 3 to US 13.5
US 3 (smallest)US 13.5 (largest)
Quick Reference Table
Click any row to highlight it. Your converted size will be highlighted automatically after converting.
US
Diameter
Circumference
UK / AU
EU
Japan
Swiss
Need the full Size Guide?
Step-by-step measurement methods, expert tips, average sizes, and FAQs — all in one place.
Discover timeless elegance with this exquisite cushion cut pink sapphire halo ring, a perfect blend of royal color and brilliant sparkle. The centerpiece features a stunning cushion cut pink sapphire in a rich, vibrant pink hue that captures light beautifully from every angle. Crafted...
Discover timeless elegance with this exquisite round emerald halo ring, a perfect blend of royal color and brilliant sparkle. The centerpiece features a stunning round-cut amethyst in a rich, vibrant green hue that captures light beautifully from every angle. Crafted in lustrous sterling silver...
Discover timeless elegance with this exquisite cushion cut fire opal halo ring, a perfect blend of royal color and brilliant sparkle. The centerpiece features a stunning cushion cut fire opal in a rich, vibrant orange hue that captures light beautifully from every angle. Crafted...
