How to Measure Your Face Shape

Measuring your face shape doesn't require special tools or training. A flexible measuring tape (the soft kind tailors use), a mirror, and five minutes is all you need. Take each measurement twice and use the average — small inconsistencies can change the shape category, so accuracy matters.

If you don't have a soft tape measure, a ruler or inch tape works too — just press it flat against your face for each measurement. You can also use a piece of string against your face, then measure the string against a ruler afterward.

Place the tape measure across the widest part of your forehead — typically about halfway between your eyebrows and your hairline. Record the measurement to the nearest quarter-inch (or half-centimetre). This number captures the upper structure of your face and is one of the four key proportions that determine your shape.

Measure straight across your face from the outer corner of one eye to the outer corner of the other. The cheekbone measurement is usually the widest point of the face, which is why it plays a central role in shape identification — particularly for diamond, oval, and heart shapes.

Measure from the bottom of one earlobe to the tip of your chin. Multiply that number by two — that's your full jawline width. The relationship between your jawline width and your cheekbone width is what separates square and round shapes from heart and diamond shapes.

Measure straight down from the centre of your hairline to the tip of your chin. This is your face length. The ratio of your face length to your cheekbone width is the single most useful ratio for narrowing down your shape — faces longer than they are wide are usually oval or oblong, while faces with roughly equal length and width are usually round or square.

Now compare your four numbers. Look for which measurement is the largest, which is the smallest, and how face length compares to cheekbone width. This is where the calculation happens — match your proportions against the descriptions below to identify your shape:

• If forehead, cheekbones, and jaw are all about equal width, and face length is similar: round or square

• If face length is noticeably greater than cheekbone width: oval or oblong

• If forehead is the widest and jaw is the narrowest: heart

• If cheekbones are the widest, with narrower forehead and narrower jaw: diamond

If you're between two shapes, that's normal — face shapes exist on a spectrum, and many people are a blend of two. The shape you identify with most strongly is the one to use for frame guidance.

Don't have a tape measure handy? Three alternative methods work well:

Method 1: The selfie method

Pull your hair back, take a straight-on selfie with neutral expression, and open the photo in your phone's editor. Use the markup or ruler tool to draw lines at each of the four reference points — forehead, cheekbones, jawline, face length. The tool typically displays the line length in pixels, which is fine — you only need the ratios, not absolute measurements.

Method 2: The string method

Use a piece of string to measure each of the four points, marking where the string ends with a pen. Then lay each piece of string flat against a ruler. Slower than a tape measure but works reliably with materials anyone has at home.

Method 3: The visual proportion method

Stand straight in front of a mirror. Pull your hair back. Without measuring, look at your face and identify your widest point — is it your forehead, your cheekbones, or your jaw? Compare the visual length of your face to its width. Most people can identify their shape category visually with reasonable accuracy. Measurements give precision; visual assessment gives a starting point.

Yes — and increasingly, this is how a lot of readers figure out their shape in 2026. Several AI tools can analyze a photo of your face and suggest a shape category. ChatGPT, Gemini, and dedicated face-analysis sites and apps all offer this capability with varying degrees of accuracy.

The tradeoff: AI face shape detection is fast, but it gives you an answer without explaining the reasoning. Knowing how to measure manually gives you control — you can verify the AI's guess against your own measurements, understand why your shape is what it is, and apply that understanding to other decisions (haircuts, makeup, jewellery, glasses).

The best approach: use AI for a quick first guess, then verify with the measurements above. If the two agree, you've got your shape. If they disagree, your manual measurements are more reliable.

This is one of the most common questions in face shape guides, and the answer varies by source. Most experts identify six main shapes: oval, round, square, heart, diamond, and oblong (sometimes called rectangular). Some sources count seven by treating oblong and rectangular as separate shapes, but most stylists and opticians treat them as one — they share the same essential proportions (long face, straight sides, strong jaw) and the same frame recommendations.

A few sources count even more shapes — triangle, pear, inverted triangle, and so on — but these are usually variants of the six main categories. For practical purposes (choosing frames, haircuts, or makeup), the six-shape system covers everyone.

Here's a quick overview of the six main face shapes before we get into specific frame recommendations:

Once you've identified your shape, choosing frames becomes a matter of proportional balance. The general principle: frames should contrast with your face shape's most pronounced feature, not echo it. Round faces benefit from angular frames; angular faces benefit from softer curves. The sections below break down the best frame styles for each of the six shapes.

Oval faces have balanced proportions: face length is slightly greater than cheekbone width, and the forehead is marginally wider than the jaw with no strong angles anywhere. This is considered the most versatile face shape because almost any frame style suits it. The goal is simply not to overwhelm the natural balance — frames should be proportional to face size.

The most flattering styles for oval faces: nearly anything works. Geometric, rectangular, aviator, oversized, cat-eye, browline, and round all suit oval faces. The main consideration is scale — frames should be roughly as wide as the broadest part of your face, neither narrower nor dramatically wider. Styles to avoid: anything dramatically oversized or undersized for your face dimensions.

Explore our expert guides to the best glasses for oval faces or the best sunglasses for oval face shapes for more inspiration.

Round faces have soft curves, full cheeks, and roughly equal width and length. The widest point is usually the cheekbones, and there are no strong angles at the jaw or forehead. The goal with round faces is to add structure and visual length — frames with angles, straight lines, and geometric shapes create contrast against the natural softness of the face.

The most flattering styles for round faces: rectangular frames, square frames, browline frames, geometric shapes with strong corners. Frames that are slightly wider than the face itself help elongate the face visually. Styles to avoid: small round frames (they echo the face shape and minimize the eye area), narrow oval frames in modest sizes.

If you want more options for your round face, check out our guides to the 15 Best Sunglasses for Round Face Shapes or the 10 best eyeglasses for round faces.

Diamond faces have prominent cheekbones with a narrower forehead and narrower jaw — the widest point is at the cheekbone, with the face tapering both upward and downward. This is the least common of the six main shapes. The goal with diamond faces is to soften the cheekbone prominence by drawing attention to the eye line and upper face, and adding visual width at the brow.

The most flattering styles for diamond faces: cat-eye shapes that lift visual weight upward, browline frames that emphasize the brow area, oval frames with a slightly wider top, statement frames at the brow. Styles to avoid: frames narrower than the cheekbones (they emphasize the cheekbone width), heavy bottom-rim frames that draw attention downward.

Find out more in our eyewear guides for diamond faces: the best eyeglasses for diamond faces and the best sunglasses for diamond faces.

Heart-shaped faces have a wide forehead, prominent cheekbones, and a narrow chin. The widest point is the forehead or upper cheekbones, and the face narrows noticeably as it reaches the jaw. The goal with heart-shaped faces is to balance the proportions — drawing visual weight downward to balance the wider top half.

The most flattering styles for heart faces: aviators, oval frames, bottom-heavy rectangles, rimless or semi-rimless frames that don't add weight at the brow line. Frames with a wider lower portion help create visual symmetry. Styles to avoid: heavy browline frames (they emphasize the wider forehead), cat-eye styles with strong upswept corners, oversized frames that overwhelm the narrower lower face. Look for styles like bottom-heavy rectangles, browline frames, or subtle cat-eyes.

Find more insights in our tailored guides to the best glasses for heart face shapes and the best sunglasses for heart faces.

Square faces have a strong, angular jaw, a broad forehead of similar width, and prominent cheekbones — all proportions roughly equal. Visual length is similar to width. The goal with square faces is to soften the existing angles with curved frame lines, while preserving the strong, defined character of the face.

The most flattering styles for square faces: round frames, oval frames, cat-eye shapes with rounded edges, thin metal or rimless frames that don't add visual weight to the jaw area. Frames that sit slightly wider than the face help break up the strong vertical lines. Styles to avoid: sharp square or rectangular frames that echo the existing angles, heavy frames that emphasize the jaw. Oval, round and thin wire frames work especially well to create balance.

Explore our complete guide to the best glasses for square faces.

Oblong faces are longer than they are wide, with a forehead, cheekbones, and jaw of roughly equal width — but face length notably exceeds face width. This is sometimes called rectangular face shape; the two terms describe the same proportions. The goal with oblong faces is to add visual width and break up the length — frames with strong horizontal lines or generous proportions help balance the face.

The most flattering styles for oblong faces: oversized frames, decorative or detailed frames at the temples, frames with strong horizontal browlines, deeper lens shapes. Frames that span more of the face width help create visual breaks. Styles to avoid: narrow rectangular frames in modest sizes (they extend the existing length), small rimless frames that don't add visual interest.

Check out our guides to oblong face eyeglasses and oblong face sunglasses for more.

Face shape guidance is useful — but it's a starting point, not a rule. Some of the best eyewear choices intentionally play against face shape for a distinctive personal style. A round face wearing round frames can look bold and intentional. A square face in square frames can look architectural and modern. The guidelines above describe what's most universally flattering — but they don't define what's right for you.

The factors that often matter more than face shape:

• Scale: do the frames fit your face proportionally, regardless of shape?

• Bridge fit: do the frames sit correctly on your nose without slipping?

• Personal style: do they reflect how you want to be seen?

• Comfort: will you actually wear them all day?

If you've found frames that make you feel confident, the face shape rules don't override that. Use this guide as a way to understand why certain frames look the way they do on you — not as a constraint on what you can wear.

• Measuring your face shape takes about five minutes and requires four measurements: forehead, cheekbones, jawline, and face length.

• There are six main face shapes — oval, round, square, heart, oblong (rectangular), and diamond. Some sources count seven; for practical purposes the six-shape system covers everyone.

• Face shape determines proportional balance, but it's a starting point, not a rule. Personal style, scale, and fit matter equally.

• AI tools can identify your shape from a photo, but verifying with manual measurements gives you more accurate and useful information.

• The general principle for frame matching: contrast with your shape's most pronounced feature (angles for round faces, curves for square faces, balance for heart and diamond).

Knowing your face shape gives you a useful reference point when choosing frames — but it's just one input. The right pair of glasses balances proportional fit with personal style, comfort, and how the frames make you feel. Use this guide to understand the why behind frame recommendations, then trust your own eye when you try frames on.

If you're ready to shop, explore our sunglasses collection or browse our prescription glasses collection and use the face shape filter to find your ideal pair

Use a soft tape measure to record four measurements: forehead width, cheekbone width, jawline width, and face length. Compare the four numbers to identify which proportions dominate. If you don't have a tape measure, a ruler, inch tape, or string against a ruler works just as well. The whole process takes about five minutes.

Most experts identify six main face shapes: oval, round, square, heart, oblong (sometimes called rectangular), and diamond. Some sources count seven by separating oblong and rectangular, though they share the same proportions. The six-shape system is what professional stylists and opticians use to recommend frames, haircuts, and makeup.

Yes — most AI tools, including ChatGPT, can analyze a clear photo of your face and suggest a shape category. Accuracy varies, and the AI doesn't explain its reasoning, so it's worth verifying the result with manual measurements. AI gives you a fast first guess; the tape measure gives you understanding you can apply elsewhere.

Diamond is generally considered the rarest of the six main face shapes — it requires high cheekbones with a narrower forehead and narrower jaw, a combination that's less common than the other five. Oval is the most common. Most people are a blend of two adjacent shapes rather than a textbook match for one.

Face shape affects how proportional and balanced glasses look on you, which influences both fit and visual impact. But it's a starting point, not a rule. Scale, bridge fit, personal style, and comfort matter equally — and many people look great in frames that technically "don't suit" their face shape. Use the guide as orientation, not a constraint.

The 1/3 face rule is a proportion theory used in art and beauty: a face is divided into three roughly equal vertical sections — hairline to brow, brow to nose tip, and nose tip to chin. Faces where these three sections are equal are considered classically balanced. It's a useful proportion check, but not essential for choosing glasses.

Three options work: take a straight-on selfie and use your phone's photo markup tools to draw and compare lines; use a piece of string against each measurement point and then measure the string against any ruler; or assess your face visually in a mirror, identifying the widest point and comparing length to width without exact numbers.

Several apps and AI tools offer face shape detection from a photo — from dedicated apps to general AI assistants like ChatGPT. They work by analyzing facial proportions in the image. Accuracy varies. For the most reliable result, use an app as a starting point, then verify with manual measurements following the five-step method above.