Broad shoulders can belong to an inverted triangle, a rectangle or an hourglass, which is why the three get mixed up. The tape separates them with two numbers: bust divided by hips decides between inverted triangle and the other two, and waist divided by hips decides between rectangle and hourglass. Your shoulders, checked in a mirror, move the call only toward or away from inverted triangle.
The Body Shape Calculator takes bust, waist, hips and the shoulder check, and shows a score for all three.
The three shapes side by side
| Inverted triangle | Rectangle | Hourglass | |
|---|---|---|---|
| Bust ÷ hips | 1.12 (spread 0.07) | 1.00 (spread 0.05) | 1.00 (spread 0.05) |
| Waist ÷ hips | 0.80 (spread 0.10) | 0.82 (spread 0.06) | 0.70 (spread 0.07) |
| Shoulders in the mirror | Wider than hips | About equal | About equal |
| Letter | V | H | X |
| What it looks like | Top half wider than bottom | Straight, balanced torso | Balanced, with a clear waist |
These are the calculator’s reference values, the point where each shape is most typical, not cut-offs. Two things in the table matter. Rectangle and hourglass share the same bust-to-hip value and differ only at the waist. And the inverted triangle has the widest waist spread, because its waist can be straight or defined without changing the shape.
Why the tape misreads broad shoulders
A tape around the bust measures the chest and breast tissue, not the shoulder bones above them. A swimmer’s frame with a modest bust can tape exactly like a rectangle: bust and hips equal, waist a little smaller. Meanwhile, a narrow-shouldered body with a full bust can tape as an inverted triangle.
That is why the calculator asks about shoulders separately, as described in the measuring guide. For a careful check, use a mirror in a fitted top, or a straight-on photo taken from a few meters away and measured on screen; the inverted triangle guide describes both methods.
How the shoulder check works
The shoulder answer is a nudge, not a switch. “Wider than my hips” multiplies the inverted triangle score by 1.2 and the pear score by 0.8. “Narrower” does the reverse. Rectangle, hourglass and apple scores never change.
In practice, the handover from rectangle to inverted triangle sits a little above a bust-to-hip ratio of 1.05, and the shoulder answer shifts it by only a small step either way. Some examples, in inches:
| Bust / waist / hips | Shoulders | Result |
|---|---|---|
| 36 / 29 / 35 | same | Rectangle 92%, inverted triangle 69% |
| 36 / 29 / 35 | wider | Rectangle 92%, inverted triangle 83% |
| 38 / 30 / 36 | same | Inverted triangle 80%, rectangle 76% |
| 38 / 30 / 36 | wider | Inverted triangle 96%, rectangle 76% |
| 38 / 26 / 36 | same | Hourglass 75%, inverted triangle 70% |
| 38 / 26 / 36 | wider | Inverted triangle 84%, hourglass 75% |
The first two rows show the limit. Bust and hips nearly equal, broad shoulders: the result stays rectangle, with inverted triangle a closer second. The calculator reports what the tape says and lets the shoulders move it only so far.
Broad shoulders over a balanced tape usually mean a rectangle with inverted-triangle traits. Use both sets of advice.
Telling them apart: three questions
- Is your bust clearly larger than your hips? Around 1.10 or more points to inverted triangle, unless your waist is close to your hips, which points to apple.
- If not, how defined is your waist? Around 0.70 reads hourglass, around 0.82 rectangle. Around 0.76 you are halfway.
- Do your shoulders overhang your hips in the mirror? If yes and the first two answers were borderline, read the inverted triangle advice alongside your top result.
What changes in practice
The three shapes need different things from the same garments:
- Inverted triangle: either balance the frame with volume below the waist and quiet shoulders, or embrace the shoulders with strong tailoring. Both are covered in the inverted triangle guide, along with the off-the-shoulder question.
- Rectangle: dress the straight line, or add a waist through structure. See dress the line, don’t fake the curves.
- Hourglass: give every garment a waist. See the hourglass body shape page.
Necklines are where broad shoulders show most, whatever your shape; the neckline guide tests the usual rules. Kibbe’s system uses “width” in a different sense from broad shoulders, which the vertical line and width guide explains.