Eyeglass frames for women are measured with the three numbers stamped on the inside temple arm: lens width, bridge width, and temple length, all in millimeters.
For the full breakdown, see our best Eyeglass Frames For Oval Face Women guide.
Whether you’re ordering a new pair online or checking why your current frames slide down your nose, the sizing system is the same for every adult frame. You don’t need a special tool or a trip to the optician—just a millimeter ruler and about two minutes. Here’s how to read the numbers you already have, measure a pair that fits, or estimate your size from scratch.
Find the Size Code On Your Current Frames
The quickest way to get your measurements is to check the frames you already wear. Look on the inside of the temple arm—the long piece that runs from the hinge to behind your ear. You’ll usually find a sequence like 48-19-140 etched or printed there.
Those three numbers translate directly to the measurements you need for a new pair:
- Lens width (48): the width of one lens at its widest point.
- Bridge width (19): the distance between the two lenses across the nose.
- Temple length (140): the length of the arm from the hinge to the tip behind your ear.
Some brands add a fourth number, which is the lens height—the vertical measurement of one lens. That matters if you need bifocals or progressives, which typically require a lens height of at least 30 mm to work properly.
Measure Your Current Frames Yourself
If the numbers have worn off, grab a millimeter ruler and measure the frame directly. Hold the ruler flat against the frame and measure each dimension separately:
- Lens width: measure across one lens at its widest point, edge to edge.
- Bridge width: measure across the nose piece, from the inner edge of one lens to the inner edge of the other.
- Temple length: measure from the hinge all the way to the tip, including the bent part that curves behind your ear. This is a common mistake—people stop at the bend and pull a length that’s too short.
Keep all your numbers in millimeters. Eyewear sizing is standardized in mm across the U.S. and most other markets, so mixing in inches will throw off the whole process.
Estimate Your Frame Size Without a Measuring Tool
If you don’t have a well-fitting pair to copy, you can still estimate your size using a standard credit or debit card. Hold the card vertically against your nose bridge, centered on your face, and note where the card’s outer edge falls compared to your eye’s outer corner.
Frames that extend too far past the sides of your face are too wide, and frames that pull inward at the temples are too narrow.
Here are the common size ranges for women’s frames, based on typical industry labeling:
| Measurement | Typical Range (mm) | What It Controls |
|---|---|---|
| Lens width | 40–60 | Overall lens size and coverage |
| Bridge width | 14–24 | Nose fit and slippage resistance |
| Temple length | 120–150 | Comfort behind the ears |
| Lens height | 32–38 (when listed) | Clearance for bifocals/progressives |
While women’s frames often favor narrower facial widths and particular style proportions, the measurement system itself is not gender-specific—it’s the same for any adult frame.
Fit Checks That Matter More Than the Numbers
The numbers get you in the right ballpark, but the final fit is about how the frame sits on your face. Three quick checks tell you whether a pair is actually right:
- Width: the frame should align with your face at the temples, not extend past them.
- Vertical position: the top of the frame should sit no higher than your eyebrows, and the bottom should not rest on your cheeks.
- Temple gap: you should fit at most one finger between your face and the start of the temple arm.
Once you’ve confirmed your measurements, the full frame size rather than just the lens width determines whether the whole front fits your face.
FAQs
Why do my glasses keep sliding down my nose?
Sliding usually means the bridge width or temple length is off. A bridge that’s too wide leaves a gap that lets the frame slip forward, while temple arms that are too short can’t grip properly. Look for a smaller bridge width or adjust the temple curve; if the frame is older, a loose hinge can also cause slippage.
How do I know if frames are too wide for my face?
Stand in front of a mirror and check the temple arms. If they extend past the sides of your face or poke outward, the frame is too wide. A correct fit has the frame edges aligning with your temples, not floating beyond them. Also, check for gap between the frame and your temples.
Can I use the measurements from sunglasses for prescription frames?
Yes, the sizing system is the same for both eyeglasses and sunglasses. The three numbers on the temple arm—lens width, bridge width, and temple length—apply to all consumer frames regardless of type. However, sunglasses may sit differently due to curvature, so try on prescription frames whenever possible.
References & Sources
- All About Vision. “How to Measure Glasses.” Explains the three-number sizing system and how to measure frame parts.
Mo Maruf
I created WellFizz to bridge the gap between vague wellness advice and actionable solutions. My mission is simple: to decode the research and give you practical tools you can actually use.
Beyond the data, I am a passionate traveler. I believe that stepping away from the screen to explore new environments is essential for mental clarity and physical vitality.