How to find the right ring size

Best option: get sized in person

A jeweler can measure with sizing rings in minutes, at no cost in most stores. This is the most accurate method.

Measuring at home

• Use a ring that already fits on the same finger and compare it to a printable ring size chart or measure its inside diameter in millimeters.
• String or paper method: wrap it around the base of the finger, mark where it meets, and measure the length in millimeters to find the circumference. This method is less accurate, so measure more than once.
• Use a plastic ring sizer if you can get one. It is more reliable than string.

Tips for accuracy

• Measure at the end of the day when fingers are largest, and at room temperature.
• The ring must slide over the knuckle but not spin freely.
• Wider bands fit more snugly. You may need a slightly larger size for a wide band.
• Dominant hands are often slightly larger.

Sizing for a surprise

• Borrow a ring she wears on the ring finger and trace or measure it, then return it.
• Ask a close friend or family member.
• When unsure, size slightly larger. Sizing down is usually easier than sizing up.

Resizing

Many plain gold and platinum bands can be resized. Eternity bands, some pavé designs, and certain metals are harder or impossible to resize. Check the retailer's resizing policy before buying.

Size systems

The US uses numeric sizes with half and quarter sizes. The UK uses letters. Many other countries use circumference in millimeters. Confirm which system a retailer uses.