Sunglasses Size Calculator
Determine whether you need narrow, standard, or wide-fit sunglasses. Convert face and frame measurements into the right lens, bridge, and temple sizes.
Recommended Fit
Small / Narrow Fit
Frame Specs
Frame width 115–128 mm
Lens width 46–50 mm
Bridge 14–18 mm
Fit Notes
Temple 135–140 mm
Your PD aligns well with standard lens widths.
How to Use This Calculator
Measure your face width
Use a flexible ruler or digital caliper to measure cheekbone to cheekbone just below your eyes.
Optional: note bridge and temple measurements
Bridge and temple numbers are printed inside most frames (e.g., 52▢18 140). Enter them for more tailored suggestions.
Review the recommended fit
Use the suggested frame, lens, and bridge ranges when shopping to avoid frames that pinch or slip.
Formula
Approx. Lens Width (mm) ≈ (Face Width ÷ 2) − Bridge Width
Frame Width ≈ (2 × Lens Width) + Bridge Width + 6 mm
The calculator compares your measurements against typical industry ranges to categorize small, medium, or large fit.
Example: Face width 132 mm, bridge 18 mm → Lens width ≈ (132 ÷ 2) − 18 = 48 mm, frame width ≈ 120 mm → Standard/medium fit.
About the Sunglasses Size Calculator
Sunglasses fit affects comfort, UV protection, and style. This tool guides you toward frames that match your facial dimensions so you can shop online without guesswork.
When to Use This Calculator
- Online shopping: Choose the right frame width and lens size before ordering.
- Prescription eyewear: Share measurements with your optician for custom frames.
- Style updates: Compare fits when switching between aviators, wayfarers, or oversized frames.
- Sport eyewear: Ensure wraparound or cycling glasses stay secure during activity.
Why Use Our Calculator?
- ✅ Measurement-based: Goes beyond “one size fits all.”
- ✅ Fit notes: Helpful tips if you’re between sizes or need adjustable features.
- ✅ International units: Works in millimeters, the standard for eyewear specs.
- ✅ Mobile friendly: Perfect for use in-store or at home.
Common Applications
Stylists: Recommend flattering frame widths for clients.
Opticians: Pre-size customers before ordering frames.
DIY shoppers: Determine if “wide fit” or “narrow fit” marketing matches your measurements.
Tips for Best Results
- Measure in front of a mirror or ask a friend for accuracy.
- Use frames with adjustable nose pads if your bridge width is narrow.
- Choose longer temples if you have a deeper head or wear helmets.
- Remember that oversized fashion frames intentionally exceed typical width ranges.
Frequently Asked Questions
What if my measurements span two categories?
Choose the larger frame for oversized fashion, or the smaller frame for a snug fit. Adjustable nose pads can fine-tune the fit.
How do I convert inches to millimeters?
Multiply inches by 25.4 to get millimeters (1 inch = 25.4 mm).
Do all frame styles fit the same?
No. Wraparound sports frames and fashion oversized frames may feel different even with similar measurements.
Can I use this for eyeglasses?
Yes! Optical frames use the same sizing system. Just share your PD with your optician for precise lens alignment.