Someone has probably told you your face shape. A hairdresser, a friend, a video that popped up while you were doing something else. There's a decent chance they were wrong, and an even better chance you've been making decisions based on it ever since.
Working it out properly takes about five minutes and one mirror. Here's how.
The mirror method
This is the quickest way and it needs almost nothing.
Tie your hair back completely. Everything off your face, including any fringe, because hair covering your forehead or jaw will change the answer. Sit or stand square to your mirror, close enough to reach it comfortably, and look straight ahead. Not up, not tilted.
Now trace the outline of your face onto the glass. A dry wipe marker works best, but an old lip liner does the job and wipes off with a bit of micellar water. Follow your hairline across the top, down past your temples and cheekbones, along the jaw and under the chin. Keep your head still while you do it, which is the part most people get wrong.
Then step back and look at the shape you've drawn, not at your face behind it. That's the whole trick. Your brain is far too used to your own reflection to see the outline objectively, and putting it on the glass makes it a shape rather than a face.
One thing worth getting right before you start: lighting. If your light is coming from one side, the shadow along your jaw will make it look narrower than it is, and a square face will happily read as oval. Even, front-on light is what you want. It's the same reason getting-ready lighting matters generally, but here it will genuinely change your answer.
The measuring method
If you'd rather have numbers, get a soft tape measure and take four:
Forehead, at the widest point, roughly halfway between your eyebrows and your hairline. Cheekbones, from the outer corner of one eye across to the other. Jawline, measured from below one ear to the tip of your chin, then doubled. Face length, from the centre of your hairline straight down to the bottom of your chin.
The relationships between those four are what matter, not the numbers themselves. If your length is noticeably greater than your cheekbone width, you're in oblong territory. If the four are all close together, you're likely round or square, and your jaw decides which. If your cheekbones are clearly the widest measurement and everything tapers away from them, you're heading towards heart or diamond.
What the shapes actually mean
Oval. Length a bit greater than width, forehead slightly wider than the jaw, and a softly rounded chin. Nothing is pronounced.
Round. Length and width are similar, with soft edges and full cheeks. The jaw curves rather than turns a corner.
Square. Length and width are similar again, but the jaw is strong and angular, and forehead, cheekbones and jaw are all about the same width.
Heart. Wide forehead and cheekbones narrowing down to a pointed chin. Often comes with a widow's peak.
Oblong. Like an oval but longer. Length is clearly the dominant measurement and the sides run fairly straight.
Diamond. Cheekbones are the widest point by some margin, with both the forehead and the jaw narrower.
Here's the caveat nobody puts in these lists: most people are a blend. Square with a rounded jaw. Oval leaning oblong. If you can't place yourself neatly into one of six boxes, that's not a failure of the method, it's just what faces are like. Take the closest two and work from there.
What you can do with the answer
Once you know, it's a useful input rather than a set of instructions.
Blush placement is the most immediate one. Higher on the cheekbone lifts a rounder face, while a softer sweep takes some edge off a strong jaw. Brows are the other big one, since a slightly stronger arch adds structure to a soft face and a flatter, longer brow balances a longer one.
Hair is where face shape does the most work of all. A parting shifts the whole visual width of your forehead, and fringe length can add or remove what feels like an inch of face.
Frames are where it matters most
Glasses are the one thing on this list you can't adjust once you've committed. Makeup comes off, hair grows, but frames sit on your face every day for years, and they're the first thing anyone looks at.
The usual principle is contrast. Angular frames add definition to a rounder or softer face. Rounded or oval frames soften a strong, square jaw. Frames that sit wider than your cheekbones add width, which is helpful on a longer face and less so on a wide one.
That's a guideline though, not a law, and there's something more important underneath it. Fit beats shape every time. A frame that's too wide will slide down your nose and sit badly no matter how well the shape theoretically suits you. Bridge width, temple length and where the frame sits relative to your brows all matter more than which of the six boxes you landed in. It's worth choosing frames for your face shape as a starting point and then checking the fit properly, rather than the other way round. Glasses2You groups frames by shape, which makes that first pass a lot faster.
When to ignore all of this
Face shape is one input. Your colouring, your hair, how strong your prescription is and what you actually like wearing are all pulling in their own directions, and any of them can reasonably outrank it.
Plenty of people wear the frames that supposedly don't suit them and look better for it, usually because they're wearing them with some confidence. If you've worn round frames for a decade and love them, a diagram is not a good enough reason to stop.
Do the exercise anyway. Five minutes and a marker, and at least you'll know what you're ignoring.
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