Upload one front-facing photo and this page will measure your face length against your cheekbone width, your forehead against your jaw, your chin width and the angle of your jawline, then name the shape those measurements land on and show you every one of them. If your face sits near a boundary — and many do — the ratios will show you that, which a single word cannot.

Pull your hair back, face a mirror straight on, and answer two questions. Is your face clearly longer than it is wide, or close to equal? Is your forehead wider than your jaw, narrower, or about the same? Those two answers alone narrow seven shapes down to two or three. A tape measure across your forehead, cheekbones and jaw settles the rest.

Seven is the most common count — oval, round, square, heart, diamond, oblong and triangle — but the number is a convention, not a fact about faces. Some systems use six by folding oblong into oval, others add an inverted triangle as a separate category. Faces vary continuously; the categories are cuts made through that continuum because they are useful for styling decisions.

They are accurate at measuring and approximate at labelling. The distances a detector computes from your photo are exact and reproducible. The step that turns those distances into one of seven words depends on boundaries that each tool sets for itself, usually without publishing them. That is why the same face gets different labels from different sites, and why this page shows you the measurements alongside the label.

The bone structure that decides your category is stable in adulthood — losing or gaining weight does not move you into a different shape, because that call comes from your skeleton, not from how much soft tissue sits on top of it. What a detector reads can still shift a little with weight, age and posture, since soft tissue affects the visible contour of the jaw and cheeks, but photo conditions move the reading far more than any of that — which is why re-testing with a different camera angle is the usual explanation for a changed result.

Partly, and which part matters. An AI landmark model places 478 points on your face, and that step is what makes the measurement possible without a tape measure. What comes after it is not AI: the ratios are arithmetic, and the boundaries they get compared against are a stated convention rather than something a model inferred. So the landmarks are AI-detected and the label is not AI-guessed. Tools that describe the whole pipeline as AI usually mean the other kind, where a model trained on labelled photos outputs a shape directly and cannot show you which measurement produced it.

No, though the two get searched interchangeably. Face shape is the outline of the front of your face, hairline to chin and ear to ear, and it is what haircut and glasses advice is built on. Head shape is the three-dimensional form of the skull, including the back and the crown, which is what matters for helmet fit, hats and shaved heads. A front-facing photo cannot see any of that, so no face shape tool can answer it. This page measures the first one.

Diamond on most counts, with triangle behind it. But rarity here is a property of the boundaries rather than of faces: diamond is a narrow band sitting between heart and oval, so moving one threshold slightly moves a lot of people in or out of it, and every tool sets that threshold for itself. The other end of the list is firmer. Oval is assigned most often, partly because it is where a face lands when no single measurement goes to an extreme, and partly because it is the fallback manual guides reach for when a face is hard to place.

Three of the seven — heart, diamond and triangle — come out of comparing your forehead against your jaw. That comparison needs no reference data and we stand behind it.

The other four need a line drawn somewhere. The seven-shape vocabulary is the one stylists and face shape guides have used for decades, and our cutoffs follow that common usage, calibrated against reference portraits and tuned as more faces go through.

Face shape tools disagree with each other more often than people expect. If two of them put you in different categories, the likeliest explanation is not that one measured wrong — it is that they drew the same line in two different places.

This is why the page gives you the ratios and not only the label. The ratios are measurements. The label is a category sitting on top of them, and knowing both is more useful than knowing only the name.

The geometry does not change. A jaw that is wider than the forehead is a triangle whether the face belongs to a man or a woman, and the measurements on this page are computed identically either way.

What differs is the average. Male faces tend to run wider at the jaw and squarer at the corner, so square and oblong come up more often; female faces more often read as oval or heart. That is a difference in where the population sits, not a difference in how any individual face gets measured.

Styling advice is where the split actually matters — the haircut that suits a square face is a different conversation for different hair lengths and textures. The measurement stops at the shape; what to do about it starts there.

It will not tell you your face shape is correct or incorrect. The seven categories are a vocabulary for describing faces, not a scale with a good end and a bad end.

It will not see your hairline. The landmark model detects skin, so what gets measured as forehead width is the visible contour of your upper face. That has an upside — grow out a fringe and your result stays the same — and a downside, which is that it may not match what you see in the mirror.

It will not settle a disagreement between two other tools. If three sites give you three answers, all three may have measured your face correctly and drawn their boundaries differently.

It will not tell you what to do with the answer. That is a styling question, and it depends on your hair, your features and what you actually want to look like.