Engagement Ring Guide

Ring Size Finder

Calibrate your screen against any bank card, then measure a ring you already own or your finger itself. No printing, no ruler and no tape measure needed.

A plain gold band lying beside a blank card of credit-card proportions, both lit evenly.

Not sure of your ring size? This tool measures it at home. You calibrate the screen against any credit card - every card in the world is the same size - and then either match a ring you already own, or measure your finger with a strip of paper.

It takes about a minute, and gives you the US, UK and European size along with the inside diameter and finger circumference. If you would rather read the numbers off a chart, the full ring size chart by country is on the next page.

Ring size finder

Measure your ring size at home, using a credit card to calibrate your screen.

  1. Calibrate
  2. Measure
  3. Result

Calibrate your screen

Hold any credit or debit card against the outline below, then adjust the slider until the two match exactly. Every card is the same size, so this teaches the page how large a millimeter is on your screen.