Face Shape Calculator

A face shape calculator classifies your face as oval, round, square, heart, oblong or diamond from four measurements: forehead, cheekbone, jawline and face length. It compares their ratios: a 7.0 in face length over a 5.7 in widest width gives a length-to-width ratio of 1.23, the balanced, gently tapering proportion that reads as an oval face.

To take the same example further: with a forehead of 5.4 in, cheekbones of 5.7 in, a jawline of 5.0 in and a face length of 7.0 in, the widest measurement is the cheekbone at 5.7 in, the cheekbone-to-jaw ratio is 5.7 ÷ 5.0 ≈ 1.14, and the forehead is a little wider than the jaw, while the cheekbones are only about 6% wider than the forehead. A face that is moderately longer than it is wide, with the cheekbones as the widest point and a gentle taper, is the textbook oval outline. These are the numbers the calculator above opens with. That is exactly the kind of decision this face shape calculator makes for you: it turns four numbers into the ratios that define each shape and returns the closest match.

Face shape is a matter of proportions, so two math tools are natural companions: the Ratio Calculator simplifies and compares any two measurements, and the Golden Ratio Calculator works out the 1.618 proportion that golden-ratio face analyses talk about. This page sticks to the six styling outlines.

The formula behind it

There is no single magic equation; face shape is decided by a small set of ratios. The most important one is the length-to-width ratio:

A value near 1.0 means the face is about as long as it is wide (round or square territory); a value of roughly 1.2 to 1.5 is balanced and moderately long (oval territory); and roughly 1.5 or higher reads as a long, rectangular oblong face. Comparing the three widths finishes the job: cheekbone ÷ jaw, forehead ÷ jaw and cheekbone ÷ forehead reveal which width is largest and how the face tapers, which is what separates heart, diamond, square and round from one another.

The calculator applies these rules in order: diamond if the cheekbones are at least 8% wider than both forehead and jaw; heart if the forehead is at least 97% as wide as the cheekbones and at least 8% wider than the jaw; triangle if the jaw is the widest and at least 8% wider than the forehead; oblong if the face is 1.5 or more times as long as it is wide; square or round if all three widths are within 10% of each other and the length-to-width ratio is under 1.25 (square when the jaw is at least 92% as wide as the cheekbones); and oval otherwise. The cut-offs are our own choice, set to match the commonly taught descriptions; stylists do not agree on exact numbers.

How the face shape calculator works: a worked example

Here is the full step-by-step calculation for a forehead of 5.4 in, cheekbones of 5.7 in, a jawline of 5.0 in and a face length of 7.0 in, exactly as the calculator runs it.

The calculator displays each ratio to two decimals, so this example shows 1.23, 1.14 and 1.08 on screen.

The six face shapes, defined

• Oval: longer than wide (ratio roughly 1.2 to 1.5), cheekbones widest, forehead a little wider than the jaw, soft curves. Often described as the most balanced shape.
• Round: length and width close (ratio near 1), forehead, cheekbones and jaw similar in width, with a soft, curved jaw and full cheeks.
• Square: length and width close, the three widths nearly equal, but with a strong, angular jawline and sharp corners.
• Heart: forehead and cheekbones are the widest part, tapering down to a narrow, often pointed chin (think an upside-down triangle).
• Oblong (rectangle): clearly longer than wide, with forehead, cheekbones and jaw close in width: a stretched square.
• Diamond: cheekbones are the dramatic widest point, with a narrower forehead and a narrow chin, on a longer-than-wide face.

Some stylists add a seventh outline, the triangle (or pear), where the jaw is the widest point and the face narrows toward the forehead. The calculator returns it only when the jaw is clearly wider than the forehead, because none of the six classic shapes describes that outline.

Face shape calculator examples: sample measurements for each shape

These six sample measurement sets (in inches) each land on a different shape when run through the calculator. Use them to see roughly what proportions produce each result and to sanity-check your own numbers.

Round and square have the same length-to-width ratio here and differ only in jaw width relative to the cheekbones (91% vs. 93%); oblong and diamond are both about 1.5 times as long as wide and differ in whether the cheekbones clearly dominate.

How to use this face shape calculator

You need just four measurements, all in the same unit (inches or centimeters; the toggle converts the numbers you have entered). Work through them in order:

1. Forehead width: the widest distance across your forehead, measured hairline to hairline, roughly halfway between your eyebrows and your hairline.
2. Cheekbone width: across the top of your cheekbones, starting just below the outer corner of each eye.
3. Jawline width: from the bottom of one ear, along the jaw, to the bottom of the other ear.
4. Face length: from the center of your hairline straight down to the tip of your chin.

The result updates as you type: you see your shape, the ratios it is based on, and a short explanation of why your measurements landed there. Change any value to see how the shape shifts.

How to measure accurately

The math is only as good as the input, and face shape hinges on small width differences, so careful measuring matters more here than in most calculators. Pull your hair back off your face and forehead. Use a soft cloth tape measure if you have one; otherwise wrap a piece of string and then lay it against a ruler. Stand square to a mirror so the tape stays level and parallel to the floor. Measure each of the four distances twice and use the average: a difference of half an inch on the cheekbone or jaw is enough to move a borderline face from oval to round, so consistency is what makes the result trustworthy.

Face measurement conversion: inches to centimeters

The result is unit-independent, but if your tape is marked in one unit and you want the other, convert with 1 in = 2.54 cm, the exact definition published by NIST. This table converts the tape readings in the range used in the examples on this page.

Values rounded to one decimal, matching the calculator's in/cm toggle. As long as all four of your measurements use the same unit, the ratios (and therefore the shape) stay identical.

A second worked example: heart vs. diamond

Imagine forehead 5.8 in, cheekbones 5.7 in, jaw 4.9 in and length 6.9 in. The widest point is the forehead, the forehead-to-jaw ratio is 5.8 ÷ 4.9 ≈ 1.18 (a clear taper toward the chin), and the length-to-width ratio is 6.9 ÷ 5.8 ≈ 1.19. A forehead that carries the width while the face narrows to a smaller jaw is the classic heart pattern. Now keep the cheekbones at 5.7 in and the jaw at 4.9 in but narrow the forehead to 5.0 in (length 7.4 in): the cheekbones become the lone widest point, 5.7 ÷ 5.0 = 1.14 times the forehead and 5.7 ÷ 4.9 ≈ 1.16 times the jaw, so the result tips to diamond. That shift shows why the two shapes are so often confused: both taper to a narrow chin, and the difference is whether the forehead or the cheekbones carry the width.

Who this calculator is for

• Anyone choosing a hairstyle who wants an objective starting point instead of guessing.
• Glasses and sunglasses shoppers deciding between round, square, aviator or cat-eye frames.
• People learning makeup contouring, where the goal often depends on knowing your base shape.
• Stylists, barbers and beauty students who want a quick, repeatable classification.
• Anyone simply curious and tired of squinting at face-shape charts trying to eyeball the answer.

Key terms explained

• Length-to-width ratio: face length divided by the widest width. The main signal for whether a face is long (oblong) or balanced.
• Taper: how the face narrows from its widest point toward the chin. Heart and diamond shapes taper strongly; round and square barely taper.
• Width spread: how different the forehead, cheekbone and jaw widths are. A small spread (all three similar) points to round, square or oblong.
• Widest feature: whichever of forehead, cheekbone or jaw is largest. Cheekbones widest leans oval or diamond; forehead widest leans heart.
• Jaw angularity: whether the jaw corners are sharp (square) or soft (round). The calculator infers this from how close the jaw width is to the cheekbone width.

Scenarios: what tips one shape into another

Holding most measurements steady and changing one feature shows how the categories border each other:

• Lengthen the face while keeping widths even: round → oblong, and oval → oblong once the ratio crosses about 1.5.
• Sharpen the jaw (jaw width close to cheekbone width, all three even): round → square.
• Widen the forehead above the jaw on a tapering face: oval → heart.
• Make the cheekbones the lone widest point with narrow forehead and chin: heart → diamond.
• Even out all three widths on a balanced-length face: oval → round or square.

What changes the result the most

If you experiment with the inputs, a few factors dominate the outcome:

• Face length: the single biggest lever for the long-vs-balanced decision; small length changes can flip oval and oblong.
• The widest width: whether the forehead, cheekbone or jaw is largest steers heart, diamond and oval.
• Jaw width relative to cheekbones: a strong jaw reads square; a much narrower jaw reads heart or diamond.
• How even the three widths are: near-equal widths point to round, square or oblong rather than the tapering shapes.

Styling tips by face shape

Most styling advice follows one idea, balance through contrast. These are stylists' rules of thumb rather than research findings, but once you know your shape you can apply them:

• Oval: the most flexible; most hairstyles and frames work, so choose by preference.
• Round: add height and length; angular glasses and styles that lengthen the face create contrast.
• Square: soften the strong jaw with rounded frames and layered, softer hair.
• Heart: balance a wide forehead and narrow chin with styles and frames that add width lower down.
• Oblong: add width and avoid extra height; fuller sides and wider frames shorten the look.
• Diamond: highlight the eyes and soften wide cheekbones; frames with detail on top or distinct browlines help.

Treat these as a tiebreaker. Hair texture, height, lifestyle and personal taste all matter, and plenty of people look great breaking the "rules" for their shape.

Why faces fall on a spectrum

It helps to picture the six shapes not as separate boxes but as points on a map with two main axes. One axis is how long the face is (the length-to-width ratio), running from "as wide as it is long" through "balanced" to "clearly long." The other is where the width sits and how it tapers: widest at the forehead, the cheekbones, or evenly across all three. Round and square share the short end of the length axis and differ only in jaw angularity. Oval sits in the middle, balanced and gently tapering. Oblong is round or square stretched long. Heart and diamond live wherever a strong taper meets a single widest feature: the forehead for heart, the cheekbones for diamond. Seeing the shapes this way explains why a tiny measurement change can nudge a result across a border: you are moving a short distance on a continuous map, not jumping between unrelated categories.

Photo apps vs. measurement: which is better?

Camera-based face-shape apps detect facial landmarks from a selfie and estimate proportions automatically, which is convenient but introduces its own errors: head tilt, camera angle, lens distortion and lighting all skew where the software thinks your jaw or hairline is, and many such apps upload your image to a server. A measurement-based tool like this one trades that convenience for control and privacy: you decide exactly where the tape sits, you can re-measure when a result looks off, and nothing leaves your browser. The trade-off is that you have to measure carefully. For a clear-cut face either approach lands on the same answer; for a borderline face, deliberate measurement usually gives you a more honest read of which two shapes you sit between.

Limitations and assumptions

This is a planning and curiosity tool, and it makes a few simplifying assumptions:

• It uses four linear measurements, not a 3D scan, so it cannot see depth, the angle of the jaw, or chin shape directly; jaw width stands in for jaw angularity.
• The ratio cut-offs are our own choice (for example 1.5 for oblong and 8% for a clear taper); stylists describe the shapes in words and do not agree on exact numbers.
• The six categories are reference outlines; most real faces are a blend, and the tool returns the single closest match.
• Results near a boundary (for example a length-to-width ratio close to 1.5) can reasonably go either way; small measurement error decides it.
• It makes no judgment about attractiveness, symmetry or the golden ratio; it only classifies the geometric outline.
• It is not a biometric, medical or identity tool and should not be used as one.

About this formula

Face-shape classification is a deterministic geometry method, not a regulated standard, so there is no government or scientific body that publishes an official "face shape" definition to cite. The ratio rules used here (length-to-width thresholds and which width is largest) turn the widely taught verbal definitions used in hairstyling and eyewear fitting into numbers. Because the math is fully deterministic (the same four measurements always produce the same shape), no external data source is required; the value is in applying the rules consistently and showing you the ratios so you can judge how clear-cut your result is.

Related calculators

If you came here while measuring or comparing yourself, a couple of sister tools may help: the BMI Calculator for a body-measurement read, and the Age Calculator for working out an exact age from a birth date. For converting your tape-measure readings between units, the Feet to Meters Converter handles length conversions.

Sources

This calculator is a deterministic geometric classifier and does not rely on legal, medical or financial data. The category definitions reflect common hairstyling and eyewear-fitting conventions, and the ratio cut-offs are explained in "The formula behind it" above. The only external figure is the unit conversion:

• NIST, Handbook 44 (2026), Appendix C: General Tables of Units of Measurement: 1 inch = 2.54 centimeters, exactly.