How is body shape determined by this calculator?

The calculator analyzes the relative proportions between your bust, waist, high hip, and hip measurements. It uses descriptive circumference-proportion heuristics to classify your silhouette into categories such as Hourglass, Rectangle, Pear, Spoon or Inverted Triangle.

What is the difference between Pear and Spoon shapes?

While both shapes are characterized by hips that are larger than the bust, a Pear shape has a relatively smooth curve from the waist to the hips, whereas a Spoon shape features a more shelf-like high hip curve, creating a distinct "shelf" appearance before the fullest part of the hips.

How do I measure my high hip and low hip accurately?

Measure your high hip at the top of your hip bone (usually 2-3 inches below your waist). Measure your low hip (usually just called hip) at the absolute widest part of your buttocks, keeping the measuring tape perfectly parallel to the floor.

Does my body shape affect my health risks?

This calculator classifies body silhouette from circumference proportions. It should not be used to infer metabolic health risk or visceral fat. For waist-based health screening, use measures such as waist-to-height ratio with appropriate medical context.

Body Shape Calculator: Silhouette & Proportions

Analyze your circumference proportions. This calculator evaluates bust, waist, high-hip and hip measurements to identify a classic body-shape category.

Identify Your Silhouette

Enter your bust, waist, high hip, and low hip measurements to determine your body shape category.

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The Method Behind Anthropometric Body Shapes

1. Silhouette Proportions

This calculator classifies silhouette from relative circumference differences. It does not measure body fat, visceral fat, metabolic health or medical risk. The result is best used as a descriptive proportion category.

2. Descriptive Classification Heuristics

The category boundaries below are descriptive circumference-proportion heuristics. They compare the absolute differences between the bust, waist and hip to classify silhouettes:

Hourglass: Bust and hips are roughly equal, with a significantly narrow waist (bust-to-waist and hip-to-waist ratios are large).
Pear: Hips are significantly larger than the bust, with a defined waist.
Rectangle: Bust, waist, and hips are relatively close in size, lacking a highly defined waist curve.
Inverted Triangle: Bust is significantly larger than the hips, showing a broad shoulder/chest structure.

Silhouette Criteria & Characteristics

Descriptive parameters used to identify common silhouette categories:

Body Shape	Mathematical Rules	Proportion Note	Limit
Hourglass	Bust - Hips ≤ 1" and Hips - Bust < 3.6", plus Waist is ≥ 9" smaller than bust or hips.	Bust and hips are relatively balanced with a defined waist.	Not a health-risk category.
Pear	Hips - Bust ≥ 3.6", and Waist is ≥ 9" smaller than hips.	Hip measurement is larger than bust measurement.	Not a body-fat measurement.
Rectangle	Hips - Bust < 3.6", Bust - Hips < 3.6", and Waist is < 9" smaller than bust or hips.	Bust, waist and hips are relatively closer in size.	Not a metabolic-health assessment.
Spoon	Hips - Bust ≥ 2", High Hip is ≥ 2" larger than waist, and Spoon-like shelf curve.	Hips and high hip are prominent relative to waist.	Not a visceral-fat estimate.
Inverted Triangle	Bust - Hips ≥ 3.6", and Waist is < 9" smaller than bust.	Bust measurement is larger than hip measurement.	Not a medical diagnosis.

How the Calculation Works

Asterisks Fit uses measurement-location terminology from apparel measurement standards, then applies its own descriptive circumference-proportion heuristics for the shape labels:

ISO 8559-1 (Garment Construction): Supports anatomical measurement locations and terminology for garment construction. It does not validate the hourglass, pear, rectangle, spoon or inverted-triangle thresholds used by this calculator.
Shape Labels: The categories are descriptive circumference-proportion heuristics, not medical, ISO, ASTM or SizeUSA-validated classifications.

Shape thresholds are descriptive heuristics. Methodology reviewed by the Asterisks editorial team. Last content review: June 2025.

Last Updated: June 2026

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Frequently Asked Questions

Disclaimer: Silhouette calculations are descriptive circumference-proportion heuristics. Individual variations in bone structure, muscularity and body composition can alter physical shape. These categories are not medical assessments. Full disclaimer →