Guides
How to Measure Your Face Shape
To measure your face shape, take four measurements (forehead width, cheekbone width, jawline width, and face length) then compare their ratios. The widest of the three widths, combined with whether your length clearly exceeds your width, is what determines whether you're oval, round, square, oblong, heart, diamond, or triangle.
This guide covers the exact numeric method, plus a simple calculator concept: plug in your four measurements and get your shape without doing the comparison yourself. For a photo-based shortcut that skips measuring altogether, use the face shape detector.
What you need
- A flexible tape measure, or a piece of string and a ruler
- A mirror, or a straight-on photo with your hair pulled back
- A neutral expression and level head position
Measure each line twice and take the average. A single pass can be skewed by a slightly angled tape or a tilted head (Omnicalculator Face Shape Calculator).
The four measurements
- Forehead width: the widest point, roughly halfway between your eyebrows and your hairline. Measure straight across.
- Cheekbone width: from just below the outer corner of one eye, at the top of the cheekbone, straight across to the same point on the other side.
- Jawline width: from just below one ear along the jaw to the chin tip, doubled, or measured corner to corner if the tape stays straight.
- Face length, from the center of your hairline straight down to the bottom of your chin, head upright.
Record all four numbers in the same unit (centimeters or inches) so the ratios compare cleanly.
Turning your numbers into a ratio
Once you have your four measurements, work out two things:
- Which is widest: forehead, cheekbones, or jaw?
- Length-to-width ratio: divide your face length by your widest measurement. A ratio noticeably above about 1.5 suggests an elongated shape (oblong); a ratio close to 1 suggests round or square; other shapes fall in between depending on which width dominates.
| Widest measurement | Length vs. width | Likely shape |
|---|---|---|
| Cheekbones | Length ≈ 1.5× width, soft tapered chin | Oval |
| Cheekbones | Length ≈ width, soft jaw | Round |
| Roughly equal all three | Length ≈ width, angular jaw | Square |
| Roughly equal all three | Length notably > width | Oblong / rectangle |
| Forehead/cheekbones, narrow chin | Length > width | Heart |
| Cheekbones, with forehead AND jaw both narrow | Length > width | Diamond |
| Jaw (or forehead, if inverted) | Length > width | Triangle / inverted triangle |
Face shape calculator: the concept
A face shape calculator takes the same four inputs (forehead width, cheekbone width, jawline width, and face length) and applies the ratio logic above automatically, so you don't have to compare rows in a table yourself.
How it works, in four inputs:
- Enter your forehead width.
- Enter your cheekbone width.
- Enter your jawline width.
- Enter your face length.
The calculator identifies your widest measurement, computes your length-to-width ratio, and matches the combination to the closest of the seven face shapes, the same logic as the table above, just automated. It's a useful middle ground between manual measuring and a full photo-based detector: you still measure yourself, but skip the comparison step.
If you'd rather skip measuring entirely, our face shape detector uses a proprietary AI model trained on labeled face photos to recognize your face shape directly from a photo (no manual measuring required) and returns your shape in seconds, free and with no sign-up required.
Face shape calculator
Enter your four measurements in the same unit for an instant estimate. This is a rules-based helper, distinct from our AI detector. For a photo-based result, use the detector.
Sources
Frequently asked questions
What's the difference between measuring and using a detector?
Measuring gives you the raw numbers yourself with a tape measure, which is transparent but takes a few minutes and some care to do accurately. Our photo-based detector works differently. It uses an AI model trained on labeled face photos to recognize your shape directly from the image rather than calculating any measurements, trading a little manual control for speed.
Do I need special tools to measure my face shape?
No. A flexible tape measure or a piece of string and a ruler is enough. A mirror or a straight-on photo helps you measure accurately, especially for the jawline, where holding the tape steady against your own face can be awkward.
How accurate is a face shape calculator?
A calculator is only as accurate as the four measurements you enter, so careful, doubled-and-averaged measuring matters more than the calculator's logic itself. Small measuring errors near a boundary (for example, a length-to-width ratio right around 1.5) can shift the result between two neighboring shapes.
Can my face shape measurements change over time?
Your underlying bone width (forehead, cheekbone, jaw) is comparatively stable in adulthood, but soft-tissue changes from weight or aging can shift how full or defined your jaw and cheeks look, which can nudge your measured ratio slightly. Large changes in your result are uncommon unless your weight or facial structure changes substantially.