Blog · 4 Nov 2026 · Sunglasses

Sunglasses size chart

Sunglasses use the same size numbers as glasses. But most pairs are a bit wider and deeper.

Three SpecFit try-ons: aviator, big white square and black rectangle sunglasses on two people — Three pairs of sunglasses, tried on in SpecFit. Each size sits on the face in a different way.

Not sure of your face width? The SpecFit app measures it.

Sunglasses size chart

Start with your face width. Then find your row.

Size	Face width	Typical lens width	Example
Small	Under 130 mm	50 to 55 mm	RB3025 in 55
Medium	130 to 140 mm	56 to 58 mm	RB3025 in 58
Large	Over 140 mm	59 to 62 mm	RB3025 in 62

These rows are a good start, not a rule. Each brand sizes its frames in its own way.

The example: the Ray-Ban Aviator, the RB3025. It comes in 55, 58 and 62 mm.
Most faces: the 58 is the most common size.
Between two rows? Check the total width of the frame. See below.

Man in gold aviator sunglasses with green lenses — Aviator, like the RB3025

Woman in gold aviator sunglasses with green lenses — Gold aviator

Woman in thin metal aviator sunglasses with pink lenses — Pink aviator

Clear glasses? Read the glasses size chart.

Read the numbers on the arm

Look inside the arm, usually the left one. You will see three numbers, like 58-14-135.

Number	Size	What it changes
58	Lens width	How wide each lens is
14	Bridge width	How the frame sits on your nose
135	Temple length	Where the arm bends at your ear

All three numbers are in millimetres (mm).

A small square can sit between the first two. It is only a mark.

The arm gives three sizes. Lens height is not on the arm.

The four sizes, one by one

Lens width: one lens, at its widest point. Sunglasses lenses often run a few mm wider than clear ones.
Bridge: the gap between the lenses. Too narrow pinches your nose. Too wide lets the frame slide.
Temple length: the arm, from hinge to tip. Most adult arms are 135 to 145 mm.
Lens height: the lens from top to bottom. Look for it on the shop page.

More in glasses frame numbers explained.

Find the total width

The arm does not give the total width. But you can work it out.

Add two lens widths and the bridge. Then add about 12 mm for the hinges.

Example: a 58-14 frame

58left lens+58right lens+14bridge+~12hinges=~142 mmtotal width

Thin metal: adds a bit less than 12 mm.
Thick plastic: adds a bit more.
Best number: the total width on the shop page. Use it when you see it.
The goal: a frame within 2 to 3 mm of your face width.

How sunglasses differ from glasses

The numbers work the same way. But the frames are cut in a different way.

Wider lenses: sunglasses often run a few mm wider. A medium glasses lens is 50 to 54 mm.
Deeper lenses: a tall lens blocks more light from above and below.
Top bar: on glasses, it sits just below the brow. On sunglasses, it sits at the brow or covers it.
Same stamp: your glasses size is a good start for sunglasses.

Man in clear silver aviator glasses — Clear aviator: top edge below the brow

Man in gold navigator sunglasses with a flat top — Sun navigator: deeper lens, top bar at the brow

Lens height and your face

Lens height is the size that is hardest to judge online. Check three things:

Too shallow: your brows show above the frame. It looks too small.
Too deep: the lenses rest on your cheeks. They lift when you smile.
Just right: the top bar follows your brows. Your cheeks stay clear.

Woman in big white square sunglasses with deep lenses — Deep square

Man in black rectangle sunglasses — Rectangle

Woman in black cat-eye sunglasses — Cat-eye

Not sure about brows? Read should sunglasses cover your eyebrows.

Check the fit in a mirror

Put the pair on. Look straight ahead.

Width: the frame is about as wide as your face.
Arms: they run straight back. They do not bow out.
Eyes: they sit near the middle of each lens.
Nose: no red marks after an hour.
Slide: the frame stays in place when you look down.

Man in black square sunglasses at home — Black square

Woman in big round tortoise sunglasses at home — Big tortoise

Man in browline sunglasses at home — Browline

How SpecFit checks the fit

SpecFit is a free iPhone app. It scans your face with the Face ID camera.

Face width: measured in real mm, to about 1 mm.
Fit check: paste a link to any pair. It scores the width against your face for free.
Try-on: see the pair on your own photo. A render costs one credit.

SpecFit scan screen with the face shape drawn on a face — One scan measures your face.

SpecFit fit check screen with a match score and a width bar for a frame — A fit check scores a frame against your face.

Know your size Find sunglasses that fit your face

One quick scan on a Face ID iPhone. Then check any pair before you buy.

Download SpecFit

Questions

What size sunglasses do I need?

Measure your face from temple to temple. Then pick a frame within 2 to 3 mm of that width.

What does 58-14-135 mean on sunglasses?

It means a 58 mm lens, a 14 mm bridge and 135 mm arms. All three numbers are in mm.

Are sunglasses bigger than glasses?

Often, yes. The lenses tend to be a few mm wider and deeper.

Is 58 mm a medium size for sunglasses?

Yes. It is the most common size of the Ray-Ban RB3025 Aviator.

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