Step 1: Prepare Your Hand

Ensure your fingers are at room temperature, as cold fingers can be smaller, and hot fingers can be larger.

Step 2: Use String or Paper

Wrap a piece of string or a strip of paper around the base of your finger. It should feel snug but not tight.

Step 3: Mark the String

Using a pen, mark the point where the string or paper overlaps to form a complete circle.

Step 4: Measure the Length

Lay the string flat and measure its length with a rule. This will give you the circumference of your finger.