Measure Your Pupillary Distance

Pupillary distance (PD) is the distance between the centers of your pupils, measured in millimeters. This measurement helps position your prescription lenses correctly in front of your eyes. When ordering prescription glasses online, your PD measurement ensures that the optical center of each lens aligns properly with your eyes.

You can measure your PD online using our free pupillary distance measurement tool. Simply upload a clear front-facing photo with a standard-sized card as a reference. The tool uses the known size of the card to estimate the scale of your image and calculate your PD measurement.

Online PD measurement tools provide an estimated measurement based on your photo. The accuracy depends on image quality, lighting conditions, camera position, and how precisely you place the measurement markers. For most standard prescription glasses orders, an online estimate can be a useful reference. However, if you already have a professional PD measurement from an optician, that measurement should be your first choice.

Not every eye prescription includes pupillary distance. Many eye doctors provide your prescription information but do not include PD because it is often measured separately when glasses are ordered. If your prescription does not show PD, you can use our free PD measurement tool to estimate it at home.

Yes. You do not need an old pair of glasses to estimate your PD. Our online PD measurement tool uses a photo of your face and a standard-size reference card to calculate the measurement directly.

No. The measurement process runs directly in your browser, and your photo stays on your own device. You do not need to create an account, subscribe, or provide personal information to use this tool.

For most everyday prescription glasses, the distance PD measurement is the number typically required when ordering lenses. Some tools may also show reading PD or computer PD, which are used for different viewing distances.