Face Shape Calculator

📋

Walk-through

How to Use This Calculator

5 steps

1

Choose Demo or Personal

Demo uses clearly labeled example measurements. Choose Personal to enter your own values; do not interpret the demo category as your result.

2

Measure four straight spans

Follow the guided steps for forehead width, cheekbone width, jaw-corner width and hairline-to-chin length, or use quick entry. Keep your head upright and use one unit. Do not curve a tape around your face or double a chin-to-ear measurement.

3

Review and optionally repeat

Check all four values before reading the result. You may enter a second set separately to compare repeat measurements; it does not overwrite or average your original values. The 5–40 cm guard is a broad typo check, not a normal range.

4

Understand and explore

Read the first matching rule and ratios. Use the ± sensitivity explorer to vary measurements without changing the original result. An unchanged category is not proof of accuracy. Choose a styling goal only if you want optional ideas.

5

Share only what you choose

Copy, CSV, PDF and sharing use a result-only summary by default. Opt in to include measurements before exporting or sharing. Check the preview and audience: anyone receiving included measurements can read them.

⚡

Reference

Formula & Methodology

3 formulas

Ratios

W = max(F, C, J); R = L / W

F = forehead width; C = cheekbone width; J = jaw width; L = hairline-to-chin length. W is the largest of the three widths, not always the cheekbone width.

First matching rule wins

J > 1.08C and J > 1.08F; (C-F)/C > 0.08 and J > 1.08F and J >= C; (C-F)/C > 0.08 and (C-J)/C > 0.08; F/J > 1.08 and J <= min(F,C); R >= 1.45; J/C >= 0.92 and R < 1.28; R < 1.25 and J/C < 0.92; otherwise oval

Check in this order: pear, triangle, diamond, heart, oblong, square, round, then oval. Earlier rules override later ones. All cutoffs are product choices for a styling heuristic, not clinically validated probabilities.

Units and sensitivity

1 in = 2.54 cm; delta = +/- 0.2 cm

Each of four measurements is changed separately by plus and minus 0.2 cm, keeping the others fixed. The resulting labels show local sensitivity only; an unchanged label is not proof of accuracy. At the 5 or 40 cm guard boundary, perturbations outside the accepted range are skipped.

✓

General reference

Trust, Methodology & Sources

· 2 sources

Editorial accountability

Methodology

Deterministic, first-match classification of four straight spans. Exact product-defined rules and priority are disclosed in the formula section. No training dataset, accuracy percentage or clinical validation is claimed.

Assumption: All four entries use one selected unit and consistent straight-span landmarks.

Assumption: The broad 5–40 cm input guard catches some entry mistakes; it does not establish biological normality.

Limitations & guidance

No inference about symmetry, jaw angles, chin shape, health or attractiveness can be made from these inputs.

The fixed +/- 0.2 cm sensitivity exercise is not a confidence interval; combined or larger errors can change results.

Sources support measurement context and unit conversion only, not the classification thresholds.

Professional guidance: For informal styling exploration only. Not medical advice, diagnosis, facial recognition or an appearance score.

Primary sources

Anthropometric Measurements (Chapter 2) - National Academies Press

SI Units – Length - National Institute of Standards and Technology

📖

Glossary

Key Terms Explained

6 terms

Forehead width Straight horizontal span across the widest forehead area.

Cheekbone width Straight horizontal span between the cheekbones.

Jaw width Straight span between the jaw corners, not the curved distance via the chin.

Face length Straight distance from the central hairline to the bottom of the chin. This is not the nose-root-to-chin length used in some clinical studies.

Maximum width The largest of forehead, cheekbone and jaw widths.

Sensitivity check A small, one-at-a-time input change used to see whether a rule boundary changes the label.

👥

Scenarios

Real-World Examples

2 worked examples

□

Square rule

Forehead width 14 cm Cheekbone width 14.2 cm Jaw width 14 cm Face length 14 cm

With F = 14, C = 14.2, J = 14 and L = 14 cm, no earlier rule matches. J/C is about 0.986 and L/W about 0.986, so the square rule matches. This says nothing about jaw angularity.

♡

Heart rule

Forehead width 14.5 cm Cheekbone width 13.5 cm Jaw width 11 cm Face length 18 cm

With F = 14.5, C = 13.5, J = 11 and L = 18 cm, F/J is about 1.318 and J is the narrowest width. The heart rule matches before the length rules; it does not measure chin shape.

🔗

Reference

Cite This Calculator

APA & MLA

Use either format to cite this calculator in a paper, report, or resource list.

APA

MLA

📄

Deep Dive

4 chapters · 3 min read

Four self-measured spans produce one of eight styling categories. The result is an informal description of ratios, not an assessment of health, attractiveness, identity or facial symmetry.

Rules and their limits

The priority order is pear, triangle, diamond, heart, oblong, square, round and oval. See the exact inequalities above. Oval is the fallback when no earlier rule matches, not an ideal or target. Four spans cannot determine jaw angles, chin pointedness or symmetry.

Measurement and uncertainty

Measure straight spans with consistent landmarks and remeasure uncertain values. The +/- 0.2 cm check is a fixed illustration of sensitivity, not a measured error bound or confidence interval. Real measurement error may be larger, and simultaneous errors are not covered.

The separate interactive explorer lets you vary one measurement by up to ±1 cm in 0.01 cm steps, displayed in the selected unit. It preserves the original measurements, result and exports; this is different from the fixed ±0.2 cm check.

Privacy and sharing

This calculator does not use a camera or upload photos. Inputs are not automatically saved or written to the URL. Copy, CSV, PDF and sharing default to a result-only summary; include measurements only by opting in. Anyone receiving those measurements can read them. Clear data removes inputs, the prior calculator storage key and measurement URL state, but cannot revoke copies already shared. Advertising and analytics still operate on this page, so local calculation does not mean no tracking.

What the sources support

The National Academies source distinguishes straight facial widths from surface arcs in anthropometry. Its clinical landmarks and purpose differ from this styling tool. NIST supports the exact inch-to-centimeter conversion. Neither source validates the eight labels, their order, thresholds or the sensitivity step.

❓

Questions

Frequently Asked Questions

7 questions

What is the difference between Demo and Personal?+

Demo shows example inputs so you can explore the workflow. Personal uses your own four measurements. A demo label is not a personal assessment.

How should I measure jaw width?+

Measure the straight span between the jaw corners below the ears. A curved tape along the jaw or twice the chin-to-ear distance measures something different.

Does a second measurement replace the first?+

No. The optional second set is kept separate for comparison. The original measurements and original result remain the reference; the calculator does not silently average them.

How is the category chosen?+

The first matching rule wins, in this order: pear, triangle, diamond, heart, oblong, square, round, then oval as the fallback. The disclosed ratios and thresholds are product-defined styling heuristics, not clinically validated probabilities.

What does the ± explorer show?+

It shows whether small changes cross a rule boundary while preserving the original result. It is not a confidence score or a measured error bound, and it cannot cover every possible measurement error.

What is included when I share or export?+

Copy, CSV, PDF and share default to a result-only summary. Measurements are included only when you select that option. A link containing measurements exposes them to its recipients; clearing this page cannot revoke copies already shared.

Do I need to choose a styling goal?+

No. Goal-based suggestions are optional ideas, not requirements. No category is better or more attractive, and four spans cannot assess health, symmetry, jaw angles or chin shape.

Download a one-page PDF of your numbers instantly. Add your email to also get our occasional calculator tips — no spam, unsubscribe anytime. Privacy.

Related calculators

Guides & articles

Glossary terms

Calculator topicFace Shape