How to Measure Your Pupillary Distance

Use this step-by-step guide to measure your pupillary distance (PD) by yourself or with the help of a friend.

Getting Started

Print PD ruler

Print PD ruler at 100% size. Do not use ‘scaling’ or ‘fit’ setting. Print setting should be ‘actual size.’

Mirror or Friend

Stand 8 inches (20cm) away from a mirror or a friend. Place & hold the PD ruler against your brow. Keep your face straight.


Take a few measurements for consistency.

Most adults have a PD between 54 – 74 mm. Most children have a PD between 43 – 54 mm.

Your PD

Look straight ahead and read the millimeter line that matches up with the center of your right pupil. This number represent your single PD in millimeters.