Body Shape Calculator

What this body shape calculator does

This calculator takes four optional measurements — bust, waist, hips and (optionally) shoulder width — and classifies the result as one of the five widely-used clothing-fit silhouettes: hourglass, pear, apple, rectangle, or inverted triangle. The classification uses the standard fashion-industry ratios first formalised in academic dress-fit research and now used by most ready-to-wear style guides. Once you have a classification, the page lists three or four cut and silhouette suggestions that tend to fit cleanly for that proportion.

A clear warning up front: this is a clothing tool, not a health, fitness or body-image tool. The five-shape system says nothing about attractiveness, fitness, or worth — it’s only useful as a sizing shorthand. Body shape is fluid: it changes with training, weight, pregnancy and age.

How to use the calculator

1. Pick inches or centimetres with the units toggle.
2. Enter bust, waist and hips. Each measurement should be the snug-but-not-tight circumference at the relevant point.
3. Optionally enter shoulder width — straight across the back between the bony tips of the shoulders. This is the only way the calculator can identify an inverted-triangle shape.
4. Read the classification and the matching style notes. Use them as a starting point when shopping.
5. Tap Copy summary for a one-line shareable string.

How to measure correctly

A flexible cloth or fibreglass tape gives the best result. A metal tape will distort the reading on a curved body and a string-plus-ruler loses accuracy in the transfer. Measure on bare skin or over a single thin layer, exhale normally before recording, and never pull tight — the goal is the contour, not the smallest possible reading.

Bust is the circumference around the fullest part of the chest, with the tape level all the way around. Check in a side mirror that the tape isn’t dipping at the back.

Waist is the narrowest point of the torso, which usually sits an inch or so above the belly button rather than at it. If you bend sideways, the natural waist is the place that creases. Many people measure too low (at the navel) or too high (under the ribs); both distort the shape classification.

Hips is the fullest point of the seat and hip line, typically 18–20 cm below the natural waist. Stand with feet together and feel for the widest part of the silhouette.

Shoulder is straight across the back, from the outer bony point of one shoulder to the other. Hold the tape horizontally; don’t curve it around the body.

Take each measurement twice. If the readings disagree by more than a centimetre, take a third and use the middle value.

Why shape-based shopping is useful

Ready-to-wear sizing varies wildly across brands. A size 10 in one brand can fit like a 12 or an 8 in another. Designers build patterns around an internal fit block — an idealised set of proportions their grader works from. When your shape is close to the block, mass- produced clothes fit well off the rack. When it isn’t, the same size will pinch in one area while gaping in another.

Knowing your shape lets you predict the mismatch. A wrap dress is drafted for a defined waist; it sits cleanly on shapes where the waist-to-hip ratio is small but tends to fall open on shapes where it isn’t. Pencil skirts assume a hip-to-waist drop close to the manufacturer’s fit block; the same skirt in the same size will fit cleanly on someone close to that ratio and pull or gape on someone who isn’t. Shape vocabulary lets you read product descriptions and fitting-room reviews critically rather than guessing.

How the five shapes are defined

The boundaries are widely cited and broadly aligned across the academic-dress and fashion-styling literature:

• Hourglass. Bust and hips are within about 5 % of each other in measurement, and waist is at least 25 % smaller than both. Drafted patterns with a strong waist (wrap, fit-and-flare, bodice-and-skirt) fit cleanly.
• Pear (triangle). Hips measure 5 % or more wider than bust, with a defined waist. The fit problem is bottom sizing running larger than top sizing in the same brand.
• Apple. Bust measures 5 % or more wider than hips, with a less- defined waist. The fit problem is top sizing running larger than bottom sizing.
• Rectangle. Bust, waist and hips are all within about 5 % of each other, with no sharp waist taper. Empire-line and belted layers add the definition that the bodyline doesn’t provide.
• Inverted triangle. Shoulders measure clearly wider than hips. Cuts that broaden the hip line (A-line, wide-leg) balance the silhouette.

The calculator applies these ratios in order and falls back to the closest match if no rule fits cleanly.

Limitations

The five-shape system isn’t universal. It originated in mid-twentieth- century Western dressmaking and ignores height, torso length, rib-cage depth, and the way clothing scale interacts with body scale. Two people categorised the same way can have very different ideal cuts. Use the result as a starting hypothesis for filtering options, not as a verdict — the most reliable feedback for fit is still the mirror and a sample garment.

Privacy

This calculator does its arithmetic on your device. No fetch call, no analytics, no logging. The page works offline once loaded.