cm to Ring Size Converter

Find ring size from diameter in cm.

US ring size 6.607

Step-by-step with your numbers:

1. Values used:

2. Diameter = 1.7

3. US ring size = 6.607

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Convert ring diameter in cm to US ring size.

The math behind it

circumference = π × cm × 10; US size ≈ (circ − 36.5)÷2.55.

Measure?

Measure the inside diameter.