Free tool
Glasses frame size calculator
Find the frame size that fits before you choose a style.
Frame size calculator
How to use it
- Measure straight across your face between the temples with a ruler, in millimetres.
- Or read the two numbers inside the arm of a frame that fits you.
- Enter either set of numbers.
- Use the suggested lens width when you shop.
Your entries stay in your browser. Nothing is sent to us. The result is for information and is not a diagnosis.
Frame sizes
| Size | Total width | Typical lens width |
|---|---|---|
| Small | Under 129 mm | 46 to 49 mm |
| Medium | 129 to 135 mm | 50 to 52 mm |
| Large | 136 to 141 mm | 53 to 55 mm |
| Extra large | 142 mm and over | 56 mm and over |
Total width is roughly two lens widths plus the bridge plus about 12 mm for the end pieces. Read more in how to choose glasses frames and pick a shape with which glasses suit my face.
Questions
What do the numbers on glasses mean?
Lens width, bridge width and arm length, all in millimetres, for example 52 □ 18 140.
What if I am between sizes?
Choose the smaller size for a high number, because smaller lenses are thinner.
Do children need a different size?
Yes. Children's frames run from about 40 to 48 mm lens width.
Prepared by the team at Babar Homeopathic Clinic & EyeBar Optical, Kangan Pur. Last updated 3 October 2026. See our medical disclaimer.
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Visit us in Kot Bismillah, Kangan Pur
- Address
- Main Road, Kot Bismillah, Kangan Pur, Tehsil Chunian, District Kasur, Punjab
- Open
- 8:00 AM to 9:00 PM, every day
- Phone
- 0301 4117591
- Phone and WhatsApp
- 0325 2386838