How to Measure Your Ring Size at Home: A Step-by-Step DIY Guide

Finding your correct ring size doesn't always require a trip to a boutique jeweler. You can determine your size at home using common household items. However, because ring sizes are measured in millimeter increments, accuracy is critical to prevent buying a ring that slips off or restricts blood flow.

The Paper Ribbon Method

The most common DIY measurement technique uses a simple strip of paper. Cut a strip approximately 10 millimeters wide and 100 millimeters long. Wrap the strip around the base of the finger you intend to size. Ensure the paper fits comfortably but snugly.

Mark the exact point where the end of the paper overlaps with a fine pen. Lay the paper flat against a metric ruler and record the length in millimeters. This length represents the inside circumference of your finger.

Measuring an Existing Ring

If you already own a ring that fits the target finger, you can measure its inside diameter directly. Place the ring on a flat surface and use a caliper or ruler to measure the distance across the widest inside edge. Be careful to measure only the interior space, excluding the metal walls.

Using the cm to mm ring size converter allows you to convert these measurements to international sizes instantly. Once you have your diameter, you can compare it to our international ring size chart to check your size across different systems.