Glasses Frame Size Calculator
Find your glasses frame size from face width and bridge measurements.
Returns lens width, bridge width, and temple length for all major face shapes.
Glasses frame sizing uses a three-number system printed inside every frame. Understanding this system lets you order glasses online with confidence and ensures a comfortable, correctly fitted pair.
The Frame Size System:
[Lens Width] − [Bridge Width] / [Temple Length]
Example: 52 − 18 / 140
- 52 = Lens width in mm (width of one lens)
- 18 = Bridge width in mm (distance between lenses, over the nose)
- 140 = Temple length in mm (length of the arm from hinge to tip)
How to find your ideal size: Check the measurements inside your current glasses frames. These are the most accurate guide to what fits your face.
General face width to lens width guide:
| Face Width | Lens Width |
|---|---|
| Narrow face | 48–52 mm |
| Average face | 52–55 mm |
| Wide face | 55–60 mm |
Bridge width: Lower bridge widths (14–17 mm) suit narrow or high-bridged noses. Higher bridge widths (18–21 mm) suit wider or lower-set noses. A poorly fitted bridge causes the glasses to slide down constantly.
Temple length:
- 135 mm: Small or narrow faces
- 140 mm: Standard (most common)
- 145–150 mm: Larger or wider heads
Total frame width = Lens Width × 2 + Bridge Width Example: 52 × 2 + 18 = 122 mm total frame width
Fitting a frame to your face shape:
- Round face → angular, rectangular frames; wider than face adds structure
- Square face → round or oval frames; softens sharp jawline
- Oval face → most shapes work; maintain frame width ≤ widest face point
- Heart-shaped face → bottom-heavy frames (club-master style) balance wide forehead
Pupillary distance (PD): This separate measurement (60–68 mm for most adults) tells the lab where to center the optical prescription within each lens — always included in prescription glasses orders.