Eyeglass Frame Size Chart (2026) — and Why It Stops at 150 mm
A real eyeglass frame size chart in millimetres: XS to XXL mapped to front width, lens width, bridge, temple length and the face width each band actually fits — plus what to do when the standard chart ends before your face begins.
Published 2026-07-29 · 9 min read
W
Woolet Editorial Team
Eyewear fit & sizing · Woolet, wide-face eyewear since 2026
Published: 29 July 2026 · Last updated: 29 July 2026
Eyeglass frames are sized in millimetres across six bands, XS to XXL, running from about 122 mm to 150 mm of total front width. Use the chart below to match your face width to a band. The important caveat: the standard industry chart ends at roughly 150 mm, which is exactly where wide faces begin.
Every retailer publishes a size chart and almost none of them publish the number you need. They give lens width, sometimes bridge, occasionally temple length — and then leave you to guess whether the frame will actually span your head. This chart gives front width as the primary column, because front width is the measurement that decides fit.
The chart
Front width is the total outer edge-to-outer edge measurement of the frame front. Face width is temple-to-temple, measured across the widest part of your head just in front of the ears. A good fit puts the two within about 3 mm of each other.
| Band |
Front width |
Lens width |
Bridge |
Temple |
Fits a face of |
| XS | 122–127 mm | 42–45 mm | 16–18 mm | 130–135 mm | up to 126 mm |
| S | 127–132 mm | 46–49 mm | 17–19 mm | 135–140 mm | 127–133 mm |
| M | 132–140 mm | 50–53 mm | 18–20 mm | 140–145 mm | 134–142 mm |
| L | 140–145 mm | 54–56 mm | 19–21 mm | 145–148 mm | 143–147 mm |
| XL | 145–148 mm | 56–58 mm | 20–22 mm | 145–150 mm | 148–152 mm |
XXL
rare, few makers | 148–150 mm | 58–60 mm | 20–22 mm | 148–150 mm | 152–154 mm |
Woolet 158
off the standard chart | 158 mm | 51–54 mm | 20–21 mm | 103 mm* | 155–161 mm |
*Woolet publishes temple length as the straight arm measurement to the start of the bend (103 mm), not the total including the drop. See the note on measurement conventions in temple-to-temple explained.
The hook nobody prints on the chart
The standard chart stops at about 150 mm of front width, fitting a face of roughly 154 mm. Faces do not stop there. A meaningful share of adult men measure 155–165 mm temple to temple, and for them every row above is a compromise. That gap — not style, not budget — is why this article exists and why Woolet builds at 158 mm.
How to read a frame size from your current glasses
Take your glasses off and look at the inside of the left temple arm, or occasionally the inside of the bridge. You will find something like 54□21-140.
- 54 — lens width in millimetres, measured horizontally across one lens at its widest point. Sometimes called eye size.
- □ — the DBL symbol, indicating that the next number is the distance between lenses.
- 21 — bridge width: the gap between the two lenses at their closest point.
- 140 — temple length: the arm, measured from the hinge screw along the arm and around the bend to the tip.
What the marking does not give you is front width. To estimate it, double the lens width, add the bridge, then add 5–8 mm for the two outer rims and hinge blocks. For 54□21 that is 54 × 2 + 21 + 6 ≈ 135 mm. If your face is 158 mm, that frame is 23 mm short — and it will hurt exactly the way described in glasses too tight on the side of your head.
This estimation gap is the single most common sizing mistake in eyewear. People shop for a "58 mm lens" believing bigger lenses mean a wider frame, then discover a 58□16 frame is narrower across the front than a 54□22 one.
FitLens · 20 seconds, phone camera
The chart is only useful once you know which row you are in. FitLens reads your face width and bridge width from a phone photo in about twenty seconds and tells you which band — including whether you are past the end of the standard chart.
Find your band in 20 seconds
Men's vs women's charts — why the women's chart is narrower
Open any retailer's sizing page and you will find two charts. The men's chart typically runs 132–148 mm of front width; the women's runs 125–140 mm. The bands carry the same letters and mean different millimetres.
The reason is anthropometric averaging. Measured head breadth across adult populations shows a female mean roughly 8–12 mm below the male mean, and frame ranges were built around those two clusters decades ago. It is a manufacturing convention, not a statement about who a frame is for.
Two practical consequences follow. First, if you are a woman with a face wider than about 145 mm, the women's chart has nothing for you and you should ignore it entirely — shop the men's or unisex chart by front width and pick the shape you like. Second, if you are a man with a narrow face, the same logic applies in reverse; a 128 mm front is not a "women's frame", it is a 128 mm front.
Woolet publishes one chart because there is one measurement. Face width in millimetres, frame front width in millimetres, matched.
Sunglasses sizing in millimetres
Sunglass charts look larger because sunglass lenses are larger — 55–62 mm is normal where 50–54 mm is normal in optical. That does not mean the frames are wider across the front. A 60□14 sunglass front measures roughly 140 mm, no more than an L-band optical frame.
For sunglasses, add 0–4 mm to your optical front width if you want the lens edge to sit past the outer corner of your eye for coverage. Beyond that the rules are identical: front width first, lens width second.
What to do if you are off the chart
If your face measures more than about 154 mm, the six-band chart has run out. Three honest options remain.
Buy at 158 mm. If you measure 155–161 mm, that is a stock size at Woolet: the 007 Round at 54□21 and the 009 Soft-Square at 51□20, both cut at a 158 mm front from Mazzucchelli acetate and hand made in the EU.
Go bespoke between 145 and 162 mm. The bands either side of 155–161 mm are the ones nobody serves: 145–154 mm is too wide for the mainstream chart and too narrow for a 158 mm signature frame, and 162 mm is past everything. Bespoke covers that full span in four shapes and sixty colour and size combinations. See bespoke.
Above 162 mm, look at made-to-order metal. We do not build past 162 mm, and saying so is more useful than pretending otherwise. A custom metal front from a specialist workshop is the realistic route.
Individual width reference pages, each with fit notes and frame recommendations: 145 mm · 150 mm · 155 mm · 158 mm · 160 mm · 162 mm · 165 mm.
FAQ
What is a standard eyeglass frame size?
The industry median is a 52 mm lens, an 18 mm bridge and a 140 mm temple, giving a total front width of roughly 128–132 mm. Most adult frames sold worldwide fall between 125 mm and 145 mm of front width, which is why the standard chart effectively ends at large.
How do I find my glasses size without having glasses?
Measure your face temple-to-temple with a ruler held flat across the widest part of your head, just in front of the ears. Your frame front width should land within about 3 mm of that number. From front width you can work back: subtract the bridge you need, divide the rest by two, and you have your approximate lens width.
Is there a glasses size chart by age?
Only loosely, and only for children. Youth frames run roughly 105–125 mm of front width from age four to twelve, after which head width is adult in most people by fourteen to sixteen. For adults, age tells you nothing useful — measure the face rather than reading a chart by year.
Why is the women's frame size chart narrower than the men's?
Because it is built on average measured head width by sex, where the female mean sits roughly 8–12 mm below the male mean. It is a statistical convention, not a rule about who a frame suits. A woman with a 156 mm face needs a 155 mm+ front just as much as a man does, and will not find it on the women's chart.
What size sunglasses do I need in mm?
The same front width as your eyeglasses, occasionally 2–4 mm more if you want coverage past the outer eye corner. Sunglass lens widths run larger — 55–62 mm is common — but lens width alone does not tell you the front width, so use the front measurement in the chart above.
What counts as a medium frame size?
In the common six-band system, medium is roughly a 50–53 mm lens with a 132–140 mm front width, fitting a face of about 134–142 mm. It is the single most produced band in eyewear and the default assumption behind almost every frame you see in a shop window.
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