Ring Size Converter

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Converts your ring size to different measurement systems, including US, UK, and diameter in millimeters.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter US Ring Size in the units shown.

Step 2

Read Circumference (mm), Diameter (mm), and UK Ring Size in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

See the inputs and their calculated results.

US Ring Size: 6

Circumference (mm): 47.88 mm; Diameter (mm): 15.24 mm; UK Ring Size: -2.19

US Ring Size: 7

Circumference (mm): 55.86 mm; Diameter (mm): 17.78 mm; UK Ring Size: -1.19

US Ring Size: 8

Circumference (mm): 63.84 mm; Diameter (mm): 20.32 mm; UK Ring Size: -0.19

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