# Ring Size Chart & Conversion Tool

> A comprehensive ring size chart converts between US sizes, inside diameter (mm), circumference (mm), and UK/EU sizing standards.

**URL:** https://www.calculatoranswers.com/ring-size-chart
**Category:** Conversions

## Quick Answer

US ring sizes range from size 3 (diameter 14.1 mm, circumference 44.3 mm) to size 13 (diameter 22.2 mm, circumference 69.7 mm).

## Definition

A converter and reference chart calculates ring sizes. Users search to convert finger measurements in millimeters to US, UK, or EU ring size standards.

## How to Use

1. **Enter Finger Circumference or Diameter** — Provide your finger measurement in millimeters into the interactive helper input fields.
2. **View Converted Ring Size** — Read the corresponding US, UK, and European ring sizes matched from the database.
3. **Consult the Reference Table** — Review the full mapping of diameters, circumferences, and regional sizing rules.

## Disclaimer

This calculator provides estimates for educational and planning purposes. Always consult a qualified professional for specific advice on financial, medical, legal, or other regulated decisions.

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