Printable PD ruler (no camera needed)
Measure your pupillary distance completely offline. Print this true-to-scale millimetre ruler, hold it to your brow in front of a mirror, and read your PD directly. No camera, no app, nothing uploaded.
Print at 100% scale. In your print dialog choose “Actual size” / 100% (not “Fit to page”), then check the calibration bar below measures exactly 100 mm with a physical ruler before measuring. This guarantees accuracy.
In the print dialog, set Scale to 100% and Margins to Default, and turn off “Headers and footers” for a clean printout.
PD Measure — onlinepdmeasure.com
0–80 mm scale. Align 0 mm over one pupil and read the mark over the other.
The mirror method, step by step
- Print & verify. Print at 100% and confirm the calibration bar is exactly 100 mm.
- Position the ruler. Stand close to a mirror and rest the printed ruler flat against your brow, just above your eyes, scale facing the mirror.
- Align zero. Close your right eye. Slide the ruler until the 0 mm mark sits over the centre of your left pupil.
- Read your PD. Hold the ruler still, switch eyes (open right, close left), and read the millimetre mark over the centre of your right pupil. That number — usually 54–74 mm — is your pupillary distance.
- Repeat. Measure two or three times and average for reliability.
Tips for an accurate reading
- Keep the ruler level and flat against your skin — tilting skews the result.
- Look straight ahead at your own eyes in the mirror, not down at the ruler.
- Good, even lighting makes your pupil centres easier to see.
- For a cross-check, also try the camera or photo method — if both agree, you can trust the number.
New to this? Start with what pupillary distance is or the full how-to-measure guide.