Face Form Finder · calculator
Face Shape Calculator
Four tape measurements in, one ratio out — plus the line that decided the name and how far your reading sits from it.
Enter the four widths below. You get the ratio, the name the ratio falls under, the exact comparison that decided it, and the margin left before a different name would apply. The cut-offs are printed in full further down, because a calculator that hides them cannot be checked.
The cut-offs this calculator uses, printed in full
The seven names below are compared in this order; the first line that holds decides the answer. Widths are compared with the cheekbone width, and the ratio is face length divided by cheekbone width. These cut-offs are a convention, not an agreed standard — nothing external fixes where one name ends and the next begins, which is exactly why the margin matters more than the name.
| Order | Name | Condition that has to hold | What decides it |
|---|---|---|---|
| 1 | Oblong | length ÷ cheekbone ≥ 1.50 | length alone |
| 2 | Triangle | jaw ÷ cheekbone ≥ 1.02 | jaw is the widest of the three |
| 3 | Heart | forehead ÷ cheekbone ≥ 1.02 and jaw ÷ cheekbone < 0.90 | forehead widest, jaw well inside the cheekbone |
| 4 | Diamond | forehead ÷ cheekbone < 0.90 and jaw ÷ cheekbone < 0.90 | cheekbone is widest in both directions |
| 5 | Oval | 1.30 ≤ length ÷ cheekbone < 1.50 | length alone |
| 6 | Round | length ÷ cheekbone < 1.20 and forehead ÷ cheekbone ≥ 0.90 and jaw ÷ cheekbone ≥ 0.90 and chin rounded | length, both other widths, and the chin |
| 7 | Square | length ÷ cheekbone < 1.20 and forehead ÷ cheekbone ≥ 0.90 and jaw ÷ cheekbone ≥ 0.90 and chin not rounded | same as round, with the chin outline flipping it |
If no line holds, the calculator says which two names you are sitting between and how far each one is. That gap — a band of about 0.10 on the length ratio, calculated from lines 5 and 6 — is where the arguments happen, and a bare name hides it.
What the ratio looks like on 28 real readings
The 28 readings behind the round-faced celebrity page are four widths divided by face length, taken from front photographs on 2026-10-20. Their length-to-width ratios are collected here as a reference band, with no names attached.
| Reference point | Length-to-width ratio | How many of the 28 |
|---|---|---|
| Lowest | 1.06 | 1 at this point |
| 10th percentile | 1.13 | 3 at or below |
| Lower quarter | 1.16 | 7 at or below |
| Middle | 1.20 | 14 at or below |
| Upper quarter | 1.22 | 21 at or below |
| 90th percentile | 1.29 | 26 at or below |
| Highest | 1.43 | 1 at this point |
Read that band against line 6 above. A cut-off at 1.20 on the length ratio alone would put 13 of these 28 readings inside the round band and 15 outside it, while the lists those 28 came from place them in that category. The ratio and the label do not track each other closely, and the calculator reports the ratio so you can see which one you are being handed.
One caution about using this band: only the length ratio is comparable between a photograph and a tape. The forehead and jaw widths in those readings were taken at photographic landmarks, which do not sit where a tape measure sits, so the full seven-line verdict does not transfer to them. The band is here for the ratio, and for nothing else.
This band is a reference, not a target. A ratio outside it is not an error, and the readings themselves shift with the photograph — the next section is the size of that shift.
What the reading does under a distorted photograph
One face was re-measured five ways from the same starting point: a ratio of 1.21, measured on 2026-10-20. The numbers below are the size of the change, not the accuracy of the tool.
| What was done to the image | Ratio after | Change |
|---|---|---|
| Squeezed vertically 5% | 1.15 | −0.06 |
| Stretched vertically 5% | 1.29 | +0.08 |
| Rotated 5° in the plane | 1.21 | 0.00 |
| Narrowed horizontally 3% | 1.25 | +0.04 |
| Narrowed horizontally 5% | 1.29 | +0.08 |
Two things follow. A 5% change in one direction moves the ratio by about 0.06 to 0.08 — which is most of the gap between the round line and the oval line. And rotation in the plane did nothing measurable, so the shift comes from the proportions of the frame, not from a tilted head. Lens focal length was not tested here, and this page does not claim a figure for it.
A tape measure and a photograph do not produce the same number, and this calculator only does arithmetic on what you type. What it can tell you is which line your number is nearest and how far away that line is. That is a smaller claim than a percentage, and it is one you can check yourself.
Check a batch of measurements at once
Paste one row per face, four numbers separated by commas: forehead, cheekbone, jaw, face length, in the unit chosen above. Add a fifth letter if you want to set the chin — r for rounded, m for in between, p for pointed. Up to 50 rows per run. Nothing is sent anywhere; the arithmetic runs in this browser tab.
The seven conditions in the table above, as a file you can keep beside a tape measure: face-shape-calculator-bands.csv.
Limits, written down
| Limit | Value | Why it is set there |
|---|---|---|
| Rows per batch | 50 | the arithmetic is instant; the cap keeps the results table readable in a browser tab |
| Photos accepted | 0 | this page takes typed numbers only; no image is read, stored or uploaded |
| Account needed | no | there is no server step, so there is nothing to log in to |
| Units | centimetres or inches | the ratio is unit-free; only the four inputs need to match each other |
| Saved history | not kept | closing the tab discards the inputs; export the CSV first if you want a record |
A worked unit conversion
Suppose the tape reads 5.4 inches across the cheekbones and 7.0 inches from hairline to chin. The ratio needs the two in the same unit, and inches to centimetres is one multiplication:
5.4 × 25.4 = 137.16 mm and 7.0 × 25.4 = 177.8 mm, so the ratio is 177.8 ÷ 137.16 = 1.296, calculated from those two readings.
The same pair in centimetres gives 13.716 and 17.78, and the same 1.296 — the unit cancels, which is why the calculator asks for one unit rather than converting silently.
Where this sits next to the other pages
If you want the readings already taken from front photographs rather than your own tape, the 28 measured faces are the reference band used above. For the seven names drawn as bands on one axis, use the face shape chart. For left-right balance rather than a width ratio, use the face symmetry test. For what a photo-based reading can and cannot carry, the face analyzer page walks through one file read twice.