Measure Your PD
Measure PD (pupillary distance), the gap between the centres of your pupils in millimetres, with a bank card and your camera. Your photo never leaves your device.
Step 1
Do you have a bank card?
Any standard credit or debit card, 85.60 mm wide, held flat under your nose for one photo. A store or ID card of the same size works too.
Step 2 of 3
Take one photo with the card under your nose
- Hold the card flat under your nose, long side across, with its middle under the middle of your nose.
- Hold the phone at arm's length, level with your eyes.
- Look into the camera with both eyes open.
The photo stays on this device. Nothing is uploaded.
Step 3 of 3
Tap the centre of the pupil of your right eye.
Step 2 of 2
Read your PD off a ruler in a mirror
- Stand 20 cm from a mirror. Hold a mm ruler flat against your brow, just above your eyes.
- Close your right eye. Put 0 under the centre of your left pupil.
- Close your left eye, open the right one and read the mark under its pupil.
How the Camera PD Measurement Tool Works
All bank cards are the same width: 85.60 mm. That makes a card a handy measuring guide for your camera. The tool compares the gap between your pupils with the width of the card and gives you the answer in millimetres.
Do You Need a Free Pupil Distance App?
No. You do not have to download a PD app: this page measures your pupillary distance in the browser. Open it on your phone, give the camera permission and take the photo. Using a tablet or a laptop with a camera works in exactly the same way, and we do not receive your image.
Pupil Distance Measurement Without a Card
Don't have a card? To measure, pick "No, use a ruler" and hold a millimetre ruler up while facing a mirror. If you have no ruler, print our PD ruler. All five ways to measure are explained step by step in how to measure PD at home.
What Your PD Test Result Means
- 63.4 mmaverage adult PD
- 64.7 mmaverage for men
- 62.3 mmaverage for women
- 56 to 71 mmwhere most adults fall
You get three numbers. Your PD is one number for both eyes, and most order forms ask for it. The number for each eye is called a dual PD, for example 31.5 and 32. Use it when a form has a box for each eye. Your reading PD, also called near PD, is about 3 mm smaller, because your eyes turn in a little when you read.
The averages come from a US Army survey that measured 3,976 adults. You can read more about the average PD, see where your number sits in the PD chart, or learn what PD means on a prescription.
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