Measure Your PD
Pupillary distance (PD) is the distance between the centers of your pupils, measured in millimeters. You need this measurement to order prescription glasses online.
Uses Your Webcam
AI-powered face detection measures your PD in real-time
100% Private
Everything runs in your browser — no images are sent anywhere
Two Modes
Quick estimate or precise measurement with a credit card
Requires a device with a camera. Works on desktop and mobile.
Camera Access Required
We need your camera to detect your face and measure the distance between your pupils. Click “Allow” when your browser asks for camera permission.
Position your face in the oval
Quick Estimate
—
mm
Detecting face…
Precise Mode
Hold a card to your forehead
- Take a credit card, ID, or any standard-size card (85.6mm wide)
- Hold it flat against your forehead, centered above your eyes
- Keep your head straight and look at the camera
CARD
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← PD →
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Your Pupillary Distance
63
mm
Measured via quick estimate (±2mm)
What’s next?
When ordering glasses, enter 63mm as your PD value. Most adults have a PD between 54 and 74mm.
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