Measure Your Pupillary Distance
Your PD in millimeters from a selfie.
Drag & drop a photo here
Front-facing · eye level · neutral face · good light
Measured in your browser — your photo never leaves your device
Same photo, same score — measured, not guessed.
AI-generated sample face · real measurements
Sample result
pupillary distance (estimate)
60.8 mm
Scaled from your iris size (average iris ≈ 11.7 mm). For glasses, confirm with an optician.
- Pupillary distance60.8 mm
- Dual PD (right / left)28.5 / 32.2 mm
- Eye spacing (ESR)0.47
- Eye gap ÷ eye width1.20
For adults 18+, for entertainment and self-improvement. Scores reflect geometry in one photo, not your worth. Terms
How it works
- 1Upload a photoA straight-on photo at eye level, neutral face, good light. Or take a selfie.
- 2We measure in your browser478 landmarks are mapped on your device and small head turns are corrected. The photo is never uploaded.
- 3Get your pupillary distance resultSee the numbers with the lines drawn on your photo. Same photo, same result, every time.
Pupillary distance (PD) is the distance between the centers of your pupils, in millimeters. This tool finds both pupils, scales the distance using the average iris width of 11.7 mm and gives your PD and single PD. For prescription glasses, confirm it with an optician.
What is pupillary distance?
Pupillary distance (PD), also called interpupillary distance (IPD), is the distance between the centres of your two pupils, measured in millimetres. Glasses makers use it to place the optical centre of each lens in front of each pupil, so it appears on most glasses orders.
There are two ways to write it. Single PD (binocular) is one number for both eyes, such as 63 mm. Dual PD (monocular) splits it into the distance from the bridge of your nose to each pupil, such as 31.5/31.5 — useful because few faces are perfectly symmetrical. There is also near PD for reading glasses, usually about 3 mm less than distance PD because the eyes turn inward to focus close.
Average pupillary distance
Most adults have a PD between about 50 and 75 mm, with an average near 63 mm (Dodgson, 2004). Men measure a little wider than women on average, and children's PD is smaller and grows into the adult range during the teens. Adult PD barely changes after that.
Because the range is wide, an average is no substitute for your own measurement — a few millimetres off can make glasses with strong prescriptions feel uncomfortable.
How to measure pupillary distance online
This tool measures PD from a selfie without a ruler or a card:
- It finds the centre of each pupil and the edges of each iris using the face model's 478 landmarks, in your browser.
- The iris is about 11.7 mm across in most adults, so it works as a built-in ruler: the pupil-to-pupil distance in pixels is converted to millimetres using your iris size in the same photo.
- It gives your PD and the distance from your midline to each pupil.
For the best result: glasses off, look straight into the lens (not at the screen), keep the camera at eye level at arm's length, and use even light so the iris edges are sharp. Take two or three photos and add them — the result is averaged.
How to measure PD with a ruler
To double-check, stand about 20 cm from a mirror and hold a millimetre ruler flat against your brow. Close your right eye and line the zero up with the centre of your left pupil. Open your right eye, close your left, and read the number under the centre of your right pupil. Repeat three times and average. A friend can do the same while you look at a point a few metres away.
How accurate is a PD from a selfie?
It is an estimate. Iris size varies from person to person, so the millimetre scale can be off by a little, and looking slightly to one side shifts the pupils. For everyday glasses, many online retailers accept a self-measured PD; for strong, progressive or high-index prescriptions, ask an optician to measure it with a pupillometer.
The same landmarks also measure your eye spacing relative to your face width — see the eye shape detector and facial ratios calculator.
Frequently asked questions
Can I measure my pupillary distance from a selfie?
Yes, as an estimate. The tool finds the centre of each pupil and uses the iris — which is about 11.7 mm across in most adults — as a ruler to convert pixels to millimetres. For prescription glasses, confirm with an optician or a ruler measurement.
What is a normal pupillary distance?
Most adults fall between about 50 and 75 mm, with an average near 63 mm (Dodgson, 2004). On average, men measure a little wider than women.
How do I get the most accurate PD from a photo?
Look straight into the lens with your eyes fully open, keep the camera at eye level and arm's length, and use good even light so the iris edges are clear. Glasses should be off.
Does pupillary distance change with age?
It grows through childhood and the teens and is essentially stable in adults, so an adult PD measured once stays useful for years.
Why are my right and left PD different?
Few faces are perfectly symmetrical, so the distance from the bridge of the nose to each pupil often differs by a millimetre or two. That is normal, and it is why glasses orders can use dual PD.
Can I measure my PD with my phone?
Yes. This tool uses a selfie and your iris size as a built-in ruler, so no card or ruler is needed. Look straight into the lens at arm's length in even light, and confirm with an optician for strong prescriptions.
Why is PD not on my prescription?
In many places PD is measured during the glasses fitting rather than the eye exam, so it is not always written on the prescription. You can ask the optician for it or measure it yourself.
Do you upload or store my photo?
No. Scoring and measurement run entirely in your browser: the face model downloads to your device and your photo never leaves it. Only the AI Analysis tools (such as age or color analysis) send a photo to our server, and they say so before you upload.