Frame Sizing Guide: Your Definitive Guide to Choosing the Perfect Sized Eyeglasses


Are you ready to buy the perfect summer shades? Or maybe you are looking for a pair of prescription eyeglasses that will fit flawlessly and add a sophisticated charm to your personality. Regardless of your reason for buying eyeglasses, it is important that you know your frame size to find the perfect sized frames.

Apart from trying a whole bunch of glasses, luckily, there are some scientific methods available that you can use to gather your frame size information. This frame sizing guide is developed to help you understand how to measure your eyeglasses and choose a pair of eyeglasses that look great and fit perfectly.

Step 1: Know the Size of Your Old Pair of Glasses

If you’re comfortable wearing your old pair of prescription glasses or sunglasses and are looking for an exact replacement, you may get one quite easily by measuring the dimensions of your existing shades or glasses. Usually, this frame size information is printed on the inside of the bridge or left temple — the part of your frame that goes behind your left ear. You should be able to find four different numbers, with each of them indicating the size of a particular component of your frame.

You can use this frame size information to order a frame from Safety Gear Pro.

Step 2: Finding Your Fit

If you’re ordering eyeglasses for the first time or if you believe that your existing pair of glasses is over- or undersized for your face, you may consider determining the ideal frame size on your own.

Measuring the Frame Width

Start with measuring the frame width. Wear a pair of prescription glasses and see if your eyes are well centered in the width of the lenses. If the frame looks too narrow, you may consider a smaller size. Similarly, opt for a larger size if the frame makes your eyes look too close.

Here are some standard dimensions of lenses based on face width.

Measuring the Bridge Size

Once you’re done measuring the width of the lenses, you should proceed to the next step of this frame sizing guide which is to calculate the bridge size — the distance between the lenses.

Take your time with this step, as the right selection of bridge size and location will determine the fit of your frame. Bridge size can range from 15mm to 22mm, with a smaller size suitable for individuals with eyes that are closely located. On the other hand, if you have wide eye sets, you choose a frame with a bridge size of 18 to 22 millimeters.

Another thing to consider is the location of the bridge. If you have a nose with a predominant bridge, you should choose frames with bridges that are even with your brow-line. On the other hand, if you have a flat nose, go for a frame with a lower bridge.

Measuring the Temple Length

Unlike frame width and bridge size, measuring temple length is relatively straightforward. An ideal frame should have temples that are long enough to sit comfortably over your ears. Temple length may range from 120 to 150 millimeters, with 135mm, 145mm, and 150mm being the most commonly used lengths.

Step 3: Choosing the Right Frame for Your Face

Apart from the frame size, the suitability of your frame for your face shape also influences the comfort and wearability of your eyeglasses. There are five basic face shapes: round, square, heart, pear, and oval. The following table will help you select the right frame based on your face shape.

Face Shape Frame Shape
Oval Square and angled frames
Square Semi-rimless, top-heavy frames
Round Square or angular-shaped frames
Heart Rimless frames, frames with a smaller width
Pear Semi-rimless, top-heavy frames

By following the steps mentioned in this quick and easy-to-understand eyeglass sizing guide, you should be able to know how to measure your eyeglasses and choose a frame that complements your face. To learn more, you can contact us at

Eyeglass Frame Sizing Guide FAQs

How Do I Find the Right Sunglasses for Me?

Selecting the best sunglasses for your lifestyle will come down to several key factors. You want to think about your glasses size, face shape, prescription and personal taste. By considering these angles, you’ll have a much easier time finding a pair you love from the extensive selection available at Safety Gear Pro.

Are Sunglasses a One-Size-Fits-All Investment?

No, one pair of sunglasses will definitely not fit all faces. Eyeglass measurements are specific. On average, you will be able to find glasses in the same breakdown of small, medium, large, etc. Small glasses are usually below 48 mm, while medium fall between 48 mm and 55 mm. Large glasses are all considered above 55 mm.

How Do I Pick the Right Size of Glasses?

Before you make an investment, you want to be sure that the glasses you select will actually fit your face. If you are ordering online and can’t try a pair on in advance, you can use eyewear you already own. Look at the frame to determine the glasses frame size and this will give you an indication of the right fit.

How Do I Pick Glasses That Look Good on Me?

Glasses size is only one factor to pay attention to when picking eyewear. To ensure that the glasses you select look good on you, it is important to think about your face shape. You can consult with a simple guide to get a better idea of how face shape impacts how your glasses look.

How Do I Know My Glasses Fit Correctly?

If you have selected the right glasses size, then the frame of the eyewear will fit snugly on the ears and nose without causing discomfort or pinching. The glasses should always feel balanced between your ears and nose, as well. If new glasses feel uncomfortable for long periods, it means you need to adjust the pair or invest in new ones.