Convert ring sizes between US, UK, EU, and JP systems. Enter a known ring size or a measurement to find the closest international match.
Convert between US, UK, EU, and JP ring sizes from a known size or measurement.
Converted sizes
US 6.0
UK L 1/2 · EU 52 · JP 12
Next size down: US 5.5 · Next size up: US 6.5
US
6.0
UK
L 1/2
EU
52
JP
12
Diameter (mm)
16.51
Circumference (mm)
51.87
US ring sizes use numbers and are common in the United States, UK sizes use letters, and EU and JP systems use numeric scales. This converter maps your selected size to the closest matching row in the SizeChartKit ring size chart. Physical fit should still be checked by diameter or circumference when possible.
Trust measurement first: diameter and circumference are the physical basis. Use the converter to compare region labels, and check the seller’s guidance when buying from a specific jeweler.
If you are between sizes, consider ring width and comfort, then cross-check with the ring size chart and ring size calculator.
Different regions label the same physical size differently. Conversion is approximate at labeling level, but diameter and circumference help resolve ambiguity. If your result looks off, follow how to measure ring size and verify with physical measurements.
Compare full rows across all systems and measurements.
Start from measured diameter or circumference to find your size.
Cross-check converted sizes with millimeter diameter and circumference rows.
Print at 100% scale for an at-home fit check.
Learn reliable ways to measure ring diameter and circumference.
Choose which system you know, then enter the size value. The converter maps it to the closest row and returns US, UK, EU, JP, diameter, and circumference.
Set “Convert from” to US size, enter the US value, then read the UK letter result in the converted sizes summary.
Use US as your input system, then check the EU value returned from the same matched row for an international equivalent.
Yes. Select UK size, enter values such as L 1/2 or N 1/2, and the converter will return the closest US size and other systems.
No. They are different labeling systems. The same physical ring can have different US and EU labels, so conversion should use a shared size row.
Trust physical measurements first (diameter or circumference), then use converter labels for region-specific shopping. Verify with the ring size chart when needed.
Compare the closest row with the next size up or down. If comfort is a priority or the band is wide, many people size up.
Yes. In diameter or circumference mode, the converter supports mm, cm, and inches and normalizes to millimeters before matching.