This ring size calculator will help you determine your correct ring size quickly and accurately.

## How the Ring Size Calculator Works

This calculator takes the measurement of the circumference of your finger in millimeters and calculates the corresponding ring size based on standard ring size charts. Simply input the measurement around your finger where the ring will sit and then click ‘Calculate’. The result will show your ring size in the U.S. standard size.

### How to Use the Ring Size Calculator

- Use a flexible measuring tape or a strip of paper to measure the circumference of your finger.
- Ensure that the measurement is taken where the ring is intended to be worn, typically at the base of the finger.
- Enter the measurement in millimeters into the calculator above.
- Click the “Calculate” button to see your ring size.

### How It Calculates the Results

The calculation is based on a simple mapping of the finger circumference to ring sizes. If the measurement is an exact match to a size, the calculator will display that size. If it falls between two sizes, it will suggest the larger size for comfort.

### Limitations of the Calculator

This calculator assumes an average finger shape and does not account for knuckle size, finger taper, or any swelling that may occur. It is a guide and shouldn’t replace a professional measurement. Sizes may vary slightly between different ring manufacturers or countries’ sizing standards.