Ratios, Not Sizes
Two people several dress sizes apart can share an identical set of ratios, because the math compares measurements to each other rather than to a chart.
Free Measurement Tool · Four Ratios, No Photo Needed
Body Ratio Calculator
A body ratio calculator is an AI-site tool that takes your bust, waist, hip, and optional shoulder measurements and converts them into four proportion ratios, then matches each result to written styling guidance.
Two people can wear the same dress size and still carry completely different proportions underneath it. Type in four numbers and see exactly where you land — waist-to-hip, waist-to-bust, shoulder-to-hip, and bust-to-hip — instead of guessing from a mirror.
Four ratios
calculated
calculated
Never stored,
always private
always private
2 free scans
daily, no sign-up
daily, no sign-up
1 Your Measurements
2 Your Ratios
Your four proportion ratios will appear here once you enter your measurements.
Share your result
What Gets Calculated
Your shape comes down to a handful of relationships between three or four numbers, not the numbers themselves. A 27-inch waist and a 40-inch waist can produce the exact same ratio, and when they do, the same styling logic applies to both.
Balance or Follow
Every result reduces to one of two moves: a defined waist gets followed with fitted shapes, an undefined one gets built with a belt, a peplum, or a vertical line.
Volume Placement
Where an outfit adds bulk — shoulders, waist, hips — either reinforces your ratios or works to counter them.
Convention, Not AI
The four ratios are calculated automatically the moment you submit your numbers. The sentences attached to each one are written by people following standard styling convention, not generated on the fly.
Nothing about this step needs a photo. Enter your numbers, and the underlying proportions come back in seconds — the same read whether you're comparing your result today against one from six months ago or checking it for the first time.
For a version of this same idea that sorts you into a named shape category instead of four raw figures, the body shape calculator runs on identical inputs.
How Ratios Become a Shape
Four comparisons, four different things they reveal — this is the reasoning behind your result, not just the number itself.
Waist : Hip
A lower figure means a more defined waist relative to your hips. It's the most commonly quoted body ratio of the four.
Waist : Bust
The same comparison run against your upper body instead of your hips. Paired with waist-to-hip, it's what defines "waist definition" as a concept.
Shoulder : Hip
Above 1.0, your shoulders are the widest point on your frame — the single reading that separates an inverted-triangle silhouette from an hourglass one.
Bust : Hip
Close to 1.0 means your top and bottom halves are balanced. Move away from 1.0 in either direction and you land closer to a pear or an inverted triangle instead.
None of these four figures decide anything on their own. A shoulder-to-hip reading near 1.0 paired with a waist-to-hip reading well below 1.0 tells a different story than either number would in isolation.
Measuring
Accurately
A tape that slips half an inch can nudge a borderline result into the wrong category entirely — these four habits are what keep a reading trustworthy.
Keep the Tape Level
Parallel to the floor the whole way around, snug against your skin but never pulled tight enough to compress anything.
Thin Clothing
A bulky sweater or layered fabric adds inches that belong to the fabric, not to you.
Stand Naturally
Don't pull your stomach in. Measure the posture you stand in day to day, not a held-in version of it.
Measure Twice
If two passes come back with different numbers, take the average rather than picking whichever one you like better.
How It Works
1
Enter Measurements
Bust, waist, and hips at minimum, shoulders if you have them handy. No photo, no upload.
2
Shape Calculated
Your figures are compared against each other as four ratios, not checked against a size chart.
3
Advice Matched
Each ratio is paired with written styling guidance suited to that specific reading.
4
Take It Shopping
Three named silhouette options come back for you to look for on the rack; the outfit silhouette guide goes deeper into why each one works for your numbers.
Why Choose
FaceShapesAI?
Advanced AI technology combined with beauty science to give you the most accurate results.
Advanced AI Technology
Trained on millions of faces for high accuracy.
Privacy Focused
Your photos are never stored. 100% secure & private.
Instant Results
Get your analysis in seconds, not minutes.
Personalized Tips
Receive style, haircut & grooming recommendations.
User Friendly
Simple, easy-to-use interface for everyone.
Works for Everyone
Our AI works for all genders, ages, and ethnicities.
Why Ratios Rather Than Measurements
A measurement by itself says almost nothing about proportion. A 30-inch waist reads completely differently on a 34-inch hip than it does on a 44-inch one, which is why every body-shape system in existence works from relationships between numbers rather than the numbers on their own.
That's also what makes these four figures size-independent. Two people several sizes apart can land on nearly identical ratios, and the exact same styling advice ends up applying to both.
A Note on Waist-to-Hip and Health
Waist-to-hip ratio shows up constantly in health writing, and there's a real body of research behind it. But that research describes patterns across large populations — and a pattern measured across thousands of people tells you close to nothing about any single individual, including you.
This calculator reports the number because people ask for it, not because it's functioning as a health check. It isn't one, and it shouldn't be read as one. Health questions belong with a doctor who has your actual history, not a ratio on a screen.
Measuring Consistently
A ratio is only as reliable as the tape that produced it. Keep it level all the way around, snug without compressing anything, and measure at the same point on your body each time if you plan on comparing results later.
Small slips matter more than they look. About an inch of slack on the waist shifts the waist-to-hip ratio by roughly 0.03 — small on paper, but enough to move a borderline result into a different shape classification entirely.
About This Tool
Ahsan Fayyaz built this one differently from the site's photo-based tools: no AI model runs against an image here. The four ratios come from straightforward arithmetic on the numbers you type in, and the styling guidance attached to each result is written by people following standard style convention rather than generated automatically. It's an informational, proportion-based tool for entertainment and styling purposes only, not medical, clinical, or professional advice of any kind.
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Your face mirrored on both sides.
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Three facial ratios measured against phi.
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The phi grid drawn over your photo.
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Beard Length Advisor
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Skin Tone Analyzer
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Body Shape Calculator
Work out your body shape from measurements.
Body Ratio Calculator
Waist-to-hip and shoulder ratios.
Outfit Silhouette Guide
Silhouettes that flatter your shape.
Dress Style Recommender
Dress cuts matched to your proportions.
Universal Size Helper
Translate your measurements across brands.
Got Questions?
Frequently Asked Questions
Your bust, waist, hips, and optionally your shoulders, converted into four ratios: waist-to-hip, waist-to-bust, shoulder-to-hip, and bust-to-hip.
No. Every input is a number you type in yourself — nothing is uploaded, and no image is involved at any point.
Same four measurements go in, but the output is different. This tool hands back the raw ratios themselves; the body shape calculator takes those same relationships and sorts the result into a named shape category instead.
No. The four ratios are calculated automatically, but the sentences describing what each one means are written by people, matched to your result from a fixed set of styling guidance.
No. The measurements you enter are used for that one calculation and aren't saved on a server. Nothing about you is retained between visits.
Two, without needing an account.
Yes — a free account raises the number of calculations you can run per day, and a paid plan removes the daily cap entirely.
Either. Use the same unit for all four measurements and the ratios come out identical either way, since only the relationship between the numbers matters.
It's optional. Three measurements — bust, waist, hips — are enough to calculate the other three ratios; shoulder-to-hip is the only one that needs it.
Because the ratio compares your waist directly against your hip measurement. The smaller your waist is relative to your hips, the lower that ratio drops.
That your shoulders measure wider than your hips — the specific reading that separates an inverted-triangle result from an hourglass one.
Your top and bottom halves are close to balanced. The further that number drifts from 1.0 in either direction, the more it points toward a pear or inverted-triangle read instead.
Regularly. Ratios compare numbers to each other, not to a size chart, so someone several sizes apart from you can land on figures nearly identical to yours.
More than it looks. Roughly an inch of slack on the waist alone shifts the waist-to-hip ratio by about 0.03 — enough to flip a borderline result into a different category.
It's reported here because people search for it, not as a health assessment. The research behind it describes population-level patterns, which don't translate reliably to any one person. Treat it as a proportion figure, not a diagnosis, and bring real health questions to a doctor.
Yes. The four ratios are calculated the same way regardless of gender — the formulas don't change based on who's entering the numbers.
Yes — your four ratios can be shared as a styled image sized for either a story post or a square post.
The outfit silhouette guide turns each ratio pattern into concrete silhouette suggestions — specific shapes and cuts to look for rather than just a number to remember.
Because a measurement alone doesn't mean much without context. A 28-inch waist reads completely differently paired with a 32-inch hip than paired with a 42-inch one — the ratio is what carries the information.
Take the average of the two readings rather than picking one. If they differ by more than an inch or so, a third pass is worth taking before trusting the result.
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Enter your measurements and see the four numbers behind your proportions.