Inches to Ring Size Converter

Find ring size from diameter in inches.

US ring size 6.629

Step-by-step with your numbers:

1. Values used:

2. Diameter = 0.67

3. US ring size = 6.629

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Convert ring diameter in inches to US ring size.

The math behind it

circumference = π × in × 25.4; US size ≈ (circ − 36.5)÷2.55.

US size?

Check international charts.