glasses frame size & fit calculator
pick your measurements from the menus. the calculator works out your ideal frame size and shape, draws it to scale, and recommends three flagship models to try.
your measurements
how to measure for glasses
how to measure your pupillary distance (pd)
your pd is the distance between your pupil centres in mm. the easy ways: a phone pd app, or your optometrist - it is often printed on your lens order. the mirror method: stand about 20cm from a mirror, hold a ruler flat against your brow, close your right eye and align the 0 with your left pupil, then close your left eye and read the mm mark at your right pupil. most adults measure 54-74mm.
how to read glasses frame sizes
look inside either temple arm for three numbers like 4822-145: lens (eye) width, bridge width and temple length, all in mm. the figure that decides fit - the front frame width across the endpieces - is not printed, so measure a pair you own with a ruler, or use the temple track method in the term definitions below.
glasses for your face shape
wide and square faces suit rounded bostons and ovals; round faces suit rectangles and squared frames; long faces suit deeper lenses; heart and inverted-triangle faces suit bottom-weighted rounds and aviators; diamond faces suit gentle upsweeps like cat-eyes; oval faces carry nearly everything. choose your face shape in the calculator above and it applies these rules and draws the result to scale.
term definitions
- pd
- pupillary distance: the distance between the pupil centres, in mm, from a phone app or optometrist. compared with each frame's lens centres to predict where the eyes sit in the lenses.
- face width
- the widest part of the face, usually across the cheekbones; sets how a frame's width reads in proportion.
- temple track
- the straight-line width between the points above the ears where glasses arms rest. easiest read from a well-worn pair laid on a ruler. defaults to face width.
- bridge
- the bridge width of a frame that already sits well on the nose; the second number printed inside most temple arms (e.g. 4921).
- max front frame width
- optional ceiling: the widest frame front the wearer will accept.
- front frame width
- the full frame width across the outer edges of the endpieces. the fit window runs from temple track −20 to −4mm, since acetate arms open about 2–10mm per side in comfort.
- eye size &
- the lens width in mm; the square separates eye size from bridge size in the standard notation (4822).
- lens height
- the vertical depth of the lens. a 34mm minimum keeps every recommendation progressive-friendly; taller is more comfortable.
- glasses shape
- optional override: forces the drawn frame and the shape preference to one of the six styles instead of the automatic best-for-face pick.
- fit style
- snug targets the bottom of the window (frame within the face), proportional the top (frame width near face width), balanced the middle. it can change which frames win.
- face shape
- sets the silhouette drawn and the frame shapes favoured: wide faces suit rounded bostons, round faces suit wellingtons, long faces suit deeper lenses, oval faces suit most shapes.
- diagram
- drawn to one mm scale: the face outline with temple track and front frame width shown as measurement lines, the recommended frame with lenses at true size, and eyes (lids, iris and pupil) drawn to true scale at the entered pd.
- ≥
- at least: the figure shown is a minimum, e.g. lens height ≥ 34mm means 34mm or taller.
- ~
- approximate spec; hand-finished acetate varies ±1–2mm between units. this tool estimates fit and is not a dispensing service - confirm sizing with the retailer and have lenses fitted by a qualified optician.