# Bikini Calculator (Body Shape)

URL: https://speedycalculator.com/calculators/everyday-life/bikini/
Last updated: 2026-10-25

> The bikini calculator identifies your body shape – hourglass, bottom or top hourglass, spoon, triangle, inverted triangle or rectangle – from bust, waist, high-hip and hip measurements, and suggests swimsuit styles that flatter it.

## Inputs

- Bust (in, cm)
- Waist (in, cm)
- High hip (in, cm)
- Hips (in, cm)

## Results

- Body shape
- Waist-to-hip ratio

## Formula

```
Classification follows the FFIT system (Lee, Istook & Nam, 2007), using the differences bust − hips, hips − bust, bust − waist, hips − waist and the high-hip ÷ waist ratio
```

## Explanation

Clothing researchers group figures into shapes by comparing a few key circumferences. Knowing your shape helps you choose cuts that balance your proportions – for example a halter top for a triangle shape or high-waisted bottoms for an inverted triangle. Every body is different, so treat the result as a starting point.

### How to use the Bikini Calculator

- **Bust**
- **Waist**
- **High hip**
- **Hips**

Results update as you type, and every field accepts the units shown in its menu.

### How it works

Measure around the fullest part of the bust, the narrowest part of the waist, the high hip (about 7 in or 18 cm below the waist) and the fullest part of the hips.

### Style suggestions

ShapeStyles that often flatterHourglassClassic triangle tops, underwire, high-waisted or side-tie bottomsBottom hourglass / triangleDetailed or bright tops, halter necks, simple darker bottomsTop hourglass / inverted triangleSimple supportive tops, patterned or ruffled bottoms, boy shortsSpoonBandeau or embellished tops, mid-rise bottomsRectangleRuffles, cut-outs and belts to add curves; string bikinis

### Tips

- Measure over thin clothing with a soft tape held snug but not tight, and keep the tape level all the way round.
- Take each measurement twice; if you are between sizes, the larger size is usually the safer choice.
- Size charts vary by brand and country – check the maker's own chart when it is available.
- For sewing projects, pre-wash fabric before cutting and buy 10% extra for shrinkage, pattern matching and mistakes.

### Common mistakes to avoid

- Mixing inches and centimetres between the tape and the size chart.
- Forgetting seam and hem allowances when cutting fabric.
- Measuring an old, stretched garment instead of your body.

### Inputs explained

FieldWhat to enterBustUnits: in, cmWaistUnits: in, cmHigh hipUnits: in, cmHipsUnits: in, cm

## Worked example

Inputs — Bust: 36 in; Waist: 28 in; High hip: 34 in; Hips: 38 in.

Results — **Body shape = Hourglass**; Waist-to-hip ratio = 0.74.

## FAQ

**How do I know my body shape?**
Compare your bust, waist and hips: similar bust and hips with a defined waist is an hourglass; hips wider than bust is a triangle; bust wider than hips is an inverted triangle.

**Which bikini suits a pear (triangle) shape?**
Tops with detail, ruffles or bright colours draw the eye up; simple, darker bottoms balance the hips.

**Which swimsuit suits an inverted triangle?**
Simple tops and bottoms with ties, ruffles or patterns add volume at the hips.


## Sources

- Lee, J. Y., Istook, C. L., Nam, Y. J. et al. (2007) – Comparison of body shape between USA and Korean women, International Journal of Clothing Science and Technology