How to measure your PD
Enable the camera, then hold a bank card horizontally against your forehead just above your eyebrows. Look straight at the lens from roughly arm's length, keep your head level, and capture. On the frozen photo, drag the two teal markers onto the centre of each pupil and the two amber markers onto the left and right edges of the card. Because the card is exactly 85.6 mm wide, the tool scales your pupil spacing against it and reports your PD in millimetres.
What the number means
Adult PD is usually between about 54 and 74 mm, with 62–64 mm common. The total (binocular) PD is pupil-to-pupil; some retailers ask for dual (monocular) PD — each eye to the nose centre — which this tool approximates as an even split. Keep the card flat and your head straight for the most accurate reading.
Frequently asked questions
What is pupillary distance?
The distance in millimetres between the centres of your pupils. It lines up each lens's optical centre with your eye. Adult PD is typically 54–74 mm.
How does this online PD meter work?
A bank card in your photo is exactly 85.6 mm wide, so it acts as a ruler. You mark both pupils and both card edges, and the tool scales the pupil distance against the card.
Is it accurate enough for glasses?
Usually within 1–2 mm for single-vision lenses if your head is straight and the card flat. For progressives or strong prescriptions, get it measured by an optician.
Single vs dual PD?
Single PD is total pupil-to-pupil; dual PD is each pupil to the nose centre. This tool gives total PD and an even per-eye split.
More free tools
Vision: Eye Test, Color Blindness Test · Measure: Actual Size Ruler · See all Alienated Tools.