Measure Your PD
Online for Free
Accurately measure your pupillary distance in seconds using advanced AI technology. No app download required. Works on any device.
Measure Your Pupillary Distance
Get optician-grade PD measurements for your glasses prescription
Most prescriptions use Distance PD. Near PD is typically 2-3mm smaller due to eye convergence.
Before You Start
- •Place a standard credit card (85.6mm width) on your forehead
- •Ensure good lighting - face the light source
- •Keep a neutral expression with both eyes open
- •Hold the camera at eye level, about arm's length away
How It Works
Place Credit Card
Place a standard credit card on your forehead. This provides a reference scale for accurate measurement.
Take Photo
Use good lighting and take a clear photo facing the camera with the credit card visible.
Get Instant Results
Our AI analyzes the photo to detect your pupils and calculate your PD with high accuracy.
Frequently Asked Questions
What is pupillary distance (PD)?
Pupillary distance (PD) is the distance between the centers of your pupils, measured in millimeters. This measurement is essential for properly aligning your glasses lenses with your eyes for optimal vision correction.
Why do I need a credit card?
Standard credit cards are exactly 85.6mm wide worldwide. By including your credit card in the photo, our AI can calculate the exact scale and convert pixel measurements to millimeters with high accuracy.
Is my photo stored or shared?
Absolutely not. All image processing happens locally in your browser. Your photos are never uploaded to any server. Your privacy is our top priority. See our Privacy Policy for details.
How accurate is this measurement?
Our tool uses advanced MediaPipe Face Mesh technology with 478 facial landmark points. When used correctly with proper lighting and a visible credit card reference, accuracy is within 1-2mm of professional measurements. However, we recommend verifying with your optician for prescription glasses.
What is a normal PD range?
The average adult PD ranges between 54-74mm, with most adults falling between 60-68mm. Children typically have smaller PD measurements. Your specific PD depends on your facial structure and is unique to you.