4-in-1 Lens: EyeQLenz™ with Zenni ID Guard. Learn more
Menu

How to Measure Glasses Size

When buying glasses online, you want to make sure you find frames that will fit you just right. Luckily, it’s really easy to find your perfect frame measurements.

Find your frame dimensions

Grab a pair of glasses that fits you just right to find your perfect measurements.

Your glasses might have numbers on the inside of the temple arm. These refer to the lens width, bridge width, and temple arm length.
The most important measurement, frame width, will not be printed on the temple arm. You can measure it yourself using the guide below.

frame measurements inscribed inside temple arm to find the right size glasses
glasses with horizontal arrow across frame to show frame width measurement

Frame width

Measure horizontally across the frame from hinge to hinge.
glasses with vertical arrow on one lens to show lens height measurement

Lens height

Measure the lens vertically at its tallest point. If you have bifocals or progressives, this should be at least 30 mm.
glasses with horizontal arrow on bridge to show bridge width measurement

Bridge

Measure the distance from lens to lens at the closest point. For the bridge, stick to a range of 2 mm less or more than the measurement.
side view of glasses with arrow showing temple arm measurement

Temple arm

Measure from the hinge to the bend, and then from the bend to the end of the arm. Add the two measurements together for the total temple arm length.
glasses with vertical arrow on one lens to show lens height measurement

Lens width

glasses with horizontal arrow across one lens to show lens width measurement
checkmark icon in a box with an arrow checked off for perfect fitting glasses

Perfect fit

Your frames will fit great if you stay within a range of 2-3 mm less or more from the total measurement.

Your pupillary distance (PD)

If you don’t know your PD, you can use our digital PD tool.

eyes with lines on pupils showing pupillary distance measurement

Try it on

Once you have your measurements, see how the frames fit on your face with our Virtual Try-On.

woman wearing aviator glasses on iPhone prototype to show virtual try on

Get 10% off your first order

Sign up now for exclusive news and savings

10% off only applies to full price items. Zenni reserves the right to modify or cancel at any time.

Flag of Current Country United States © COPYRIGHT 2025 ZENNI OPTICAL ®, INC. ALL RIGHTS RESERVED.