Loading calculators...
Fetching calculator categories and tools for this section.
Preparing tools and content for you. This usually takes a second.
Fetching calculator categories and tools for this section.
Enter left and right monocular PD (or total binocular PD) in millimeters. The calculator sums monocular values, estimates near PD (distance − 3 mm for convergence), flags asymmetry, and suggests frame size hints for single vision, bifocal, and progressive lenses. Educational—not a prescription or optician replacement.
Last updated: June 5, 2026
Progressive lenses and strong prescriptions need in-person pupillometer measurement. Use this tool for learning, online-order estimates, and double-checking your written PD.
Enter monocular left + right (preferred) or total binocular PD. Left + right should equal total.
Distance PD (binocular)
62 mm
Left (OS)
31 mm
Right (OD)
31 mm
Near PD (est.)
59 mm
Asymmetry
0 mm
Large frame suitable
Near PD rule
Estimated near PD = distance PD − 3 mm. Optician measurement preferred for progressives.
Average adult (default)
62 mm
Near 59 mm · Large frame suitable
Smaller PD (53 mm)
53 mm
Small frame recommended
Child-range (55 mm)
55 mm
Remeasure as child grows
Large PD (67 mm)
67 mm
Progressive · Extra large frame required
Asymmetric example: 30/33 mm (Δ 3 mm) → total 63 mm
Binocular PD positions both lens optical centers; monocular PD is measured from the frame bridge centerline.
| Step | Formula | Example |
|---|---|---|
| Monocular PD sum | Left PD + Right PD = Total (binocular) PD | 31 mm + 31 mm = 62 mm |
| Distance PD | Measured at far fixation (6 m+) | 62 mm distance PD for single-vision distance glasses |
| Near PD estimate | Distance PD − 3 mm (convergence) | 62 − 3 = 59 mm near PD for reading segment |
| Optical center | Lens OC placed at each monocular PD from frame centerline | Left lens OC 31 mm from bridge; right 31 mm |
| Group | Range | Note |
|---|---|---|
| Adult women (typical) | 58–64 mm | Individual variation is normal |
| Adult men (typical) | 60–68 mm | Facial width correlates loosely with PD |
| Children 8–12 years | 50–58 mm | Increases until late teens |
| Out of range | <50 or >75 mm | Verify with optician; may need custom frames |
| Total PD | Category | Bridge / width |
|---|---|---|
| <55 mm | Small frame | 16–18 mm; 120–130 mm |
| 55–59 mm | Medium frame | 18–20 mm; 130–140 mm |
| 60–64 mm | Large frame | 20–22 mm; 140–150 mm |
| ≥65 mm | Extra large | 22–24 mm; 150 mm+ |
| Lens | Tolerance | Note |
|---|---|---|
| Single vision | ±2 mm | Most forgiving; one optical center per lens |
| Bifocal | ±1–2 mm | Distance PD for OC; segment height measured separately |
| Progressive | ±1 mm | Corridor alignment sensitive—professional fitting strongly recommended |
| Computer / office | ±1–2 mm | Often uses intermediate or adjusted near PD |
| Method | Accuracy | Best for |
|---|---|---|
| Corneal reflection pupillometer | ±0.5 mm | Gold standard in optical shops |
| Millimeter ruler + mirror | ±1–2 mm | Home estimate with careful technique |
| Smartphone app + card reference | ±1–3 mm | Online eyewear orders—verify if high Rx |
| Prescription PD from optometrist | Clinical | Authoritative for progressive/high cylinder |
| Offset | Use | Example (62 mm distance) |
|---|---|---|
| 2 mm | Mild convergence estimate | 62 distance → 60 near |
| 3 mm (default here) | Common teaching midpoint | 62 distance → 59 near |
| 4 mm | Strong near-work convergence | 62 distance → 58 near |
| Measured near PD | Best for progressives | Optician measures at 40 cm reading distance |
This pupillary distance calculator is for learning and self-estimation when ordering eyewear. It does not conduct eye exams, verify prescriptions, or replace licensed opticians. ANSI and ISO standards govern professional PD measurement devices.