Inverted Triangle vs Hourglass: how to tell
Both shapes can carry a defined waist and a full bust. The difference is whether the top of the frame outmeasures the hip by more than 5%.
The two reference forms
Each form is drawn from the measurements on its own page, taped at the four lines the calculator reads. The difference between the two is the difference the rule below measures.
Inverted Triangle
Shoulders and bust wider than hips
Hourglass
Balanced bust and hips, defined waist
What separates them
This is the pair that three-measurement calculators cannot separate, because the measurement that decides it is the one they skip. Bust, waist and hip alone can describe an hourglass and an inverted triangle identically: a full bust, a drawn waist, a moderate hip. The shoulder is what tells them apart. If the larger of the shoulder and bust readings is more than 5% above the hip, the figure is shoulder-dominant and reads as an inverted triangle. If the top and the hip are within 5% of each other and the waist comes in to 75% of both, it is an hourglass.
The calculator checks dominance before it checks the waist. So a figure with a 40-inch shoulder, a 27-inch waist and a 36-inch hip is an inverted triangle, not an hourglass, however small the waist is. The top leads the hip by 11%, and that decides it before the waist is looked at.
The boundary case is the athletic hourglass: built shoulders over a narrow waist and a hip that still measures close to the bust. As long as the shoulder stays within 5% of the hip the figure is an hourglass, and the hourglass page describes it as a sub-type. Push the shoulder past 5% and the same body is an inverted triangle, and the advice changes from following the waist to softening the shoulder.
Side by side
| Inverted Triangle | Hourglass | |
|---|---|---|
| Shoulder or bust against hip | More than 5% larger | Within about 5% |
| Waist | May be defined or straight; it does not decide | 75% or less of both bust and hip |
| Shoulder line | Square and visibly wider than the hip | Level with the hip |
| Seat and hip | Narrow, often flat | Full enough to match the bust |
| The deciding test | max(bust, shoulder) > hip × 1.05 | No dominant end, then the waist test |
How to tell at home
- Measure across the back from shoulder edge to shoulder edge. More than two inches over a 36-inch hip says inverted triangle
- You size up on tops to fit the shoulder and the waist hangs loose: inverted triangle. Tops fit at both: hourglass
- Shirts pull across the back and gape at the button line on an inverted triangle
- Stand square in a mirror: a shoulder that is clearly the widest line points to inverted triangle
- You buy a smaller size on the bottom than the top as an inverted triangle, and the same size as an hourglass
No tape measure? The body type quiz asks these comparisons as seven questions you can answer in a mirror, and runs the same rules in the same order.
The deciding test
The rule the calculator applies, with the thresholds it uses.
max(bust, shoulder) 40 > hip 36 × 1.05 = 37.8 → INVERTED TRIANGLE · shoulder 37 within 5% of hip 38, waist 27 ÷ both ≤ 0.75 → HOURGLASS
Every threshold here is published on the methodology page.
Questions
- Am I an inverted triangle or an hourglass?
- Measure your shoulders across the back, then compare the larger of shoulder and bust to your hip. If it is more than 5% bigger, you are an inverted triangle, whatever your waist measures. If the top and hip are within 5% and your waist is 75% or less of both, you are an hourglass.
- Can an inverted triangle have a small waist?
- Yes, and many do. The inverted triangle test only asks whether the top of the frame outmeasures the hip. A defined waist does not change the reading, because dominance is tested before waist definition. The styling for a small-waisted inverted triangle borrows from the hourglass: follow the waist, but still take structure out of the shoulder.
- Why do I get hourglass on other calculators and inverted triangle here?
- Most calculators ask for bust, waist and hip only. Without a shoulder measurement they cannot see shoulder dominance, so a broad-shouldered figure with a drawn waist reads as hourglass. This calculator asks for the shoulder and tests it first.
Read both
Settle it with your own numbers
Four measurements, one answer, and the comparison that produced it printed underneath so you can check which side of the line you fall.
Run the body shape calculator