Body Shape Calculator
Bust 96 cm, waist 70 cm, and hips 98 cm suggest an hourglass-leaning result under the rules used here. This body shape calculator compares bust, waist, and hip measurements and applies a simple ruleset to suggest a broad body-shape category. Use the same unit for all three measurements. The result is descriptive only, so treat it as a sizing or styling guide rather than a health judgment.
Quick answer
The calculator compares bust, waist, and hip proportions instead of body weight.
Use the same unit for all three measurements. This form does not convert between inches and centimeters.
What this tells you
- •The calculator compares bust, waist, and hip proportions instead of body weight.
- •It suggests five broad outcomes: hourglass-leaning, triangle-leaning, inverted triangle-leaning, rectangle-leaning, and oval-leaning.
- •You can use inches or centimeters because the rules depend on proportions, not the unit itself.
- •The result is a descriptive estimate, not a diagnosis or a complete body assessment.
How to Use
- 1Choose inches or centimeters for the measurement labels.
- 2Enter your bust, waist, and hip measurements in that same unit.
- 3Calculate to see the suggested body-shape category and the supporting ratios.
- 4Use the result as a rough styling reference, then ignore it if it does not fit how you dress or size yourself.
How It Works
Formula
Bust-to-hip ratio = bust / hips
Waist-to-bust ratio = waist / bust
Waist-to-hip ratio = waist / hips
Rules used here:
1. Oval-leaning if waist is within 5% of both bust and hips
2. Hourglass-leaning if bust and hips are within 5% of each other and waist is at least 25% smaller than both
3. Triangle-leaning if hips are at least 5% larger than bust and waist is at least 20% smaller than hips
4. Inverted triangle-leaning if bust is at least 5% larger than hips and waist is at least 20% smaller than bust
5. Rectangle-leaning otherwiseThe calculator compares each measurement as a proportion, so the unit cancels out as long as bust, waist, and hips all use the same unit. The rules are intentionally simple and deterministic. They do not measure frame size, shoulder width, posture, muscle mass, or where you naturally carry weight.
Calculation note: values are processed in the order shown above, using the current input units.
Worked Examples
Hourglass-leaning example
Bust and hips are close to balanced, and the waist is more than 25% smaller than both, so the hourglass rule is the first match.
Triangle-leaning example
The hips are more than 5% larger than the bust, and the waist is at least 20% smaller than the hips, so the rules sort this set into the triangle group.
Body Shape Rules Used Here
These are the exact cutoffs used by this calculator.
| Category shown | Main proportion rule | How to read it |
|---|---|---|
| Oval-leaning | Waist within 5% of both bust and hips | Midsection measurements stay close to the upper and lower measurements |
| Hourglass-leaning | Bust and hips within 5%, waist at least 25% smaller than both | Upper and lower measurements stay balanced with a clearly smaller waist |
| Triangle-leaning | Hips at least 5% larger than bust, waist at least 20% smaller than hips | Lower-body measurement leads the set |
| Inverted triangle-leaning | Bust at least 5% larger than hips, waist at least 20% smaller than bust | Upper-body measurement leads the set |
| Rectangle-leaning | Any set that does not meet the stronger cutoffs above | Measurements read as more even overall |
This table is a practical classification system for broad shape labels. It is not a medical standard.
Measuring and reading the category
Use a flexible tape over underwear or thin clothing. Measure the bust around its fullest point, the waist at one consistent natural or clothing-fit landmark, and the hips around the fullest part of the seat. Keep the tape level and snug without pressing into the body. A mirror or another person can help catch a tilted tape.
The unit selector changes labels only. The calculation receives the three numbers and compares ratios, so inches and centimeters work when all values use the same unit. Mixing units produces meaningless ratios. Measure under similar conditions if you want to compare results, since posture, breathing, clothing, bra style, meals, and ordinary body changes can shift the tape reading.
The rules run in a fixed order. Oval-leaning is checked first, then hourglass-leaning, triangle-leaning, inverted triangle-leaning, and finally rectangle-leaning. Rectangle is the fallback for any set that misses the stronger cutoffs. It does not mean the three measurements are identical. A result near a threshold could switch after a small measurement difference.
The calculator uses bust rather than shoulder width, even though some styling systems define upper-body shape partly through shoulders. It also omits rib cage, torso and leg length, height, cup size, muscle distribution, posture, and garment construction. Another website, stylist, pattern system, or clothing brand can use different names and thresholds and return another label from the same measurements.
A category does not select a clothing size. Size charts compare body or garment dimensions, while shape labels describe relative proportions under one ruleset. Stretch, ease, seams, neckline, shoulder fit, rise, length, and personal preference all affect how clothing fits. Use the exact brand chart and garment measurements for a purchase.
These labels are optional shorthand. They do not rank bodies or define femininity, masculinity, health, fitness, attractiveness, or worth. Bodies vary across sex, gender, age, disability, pregnancy, surgery, transition, and ordinary life changes. If a label feels inaccurate or unhelpful, disregard it and use the measurements that matter for the task.
A sudden or concerning change in a body measurement is outside the purpose of this tool. It cannot identify a cause or assess medical risk. A qualified healthcare professional can evaluate symptoms or changes that concern you without relying on a styling category.
Common mistakes
- Mixing inches for one measurement with centimeters for another
- Measuring over thick clothing or at different landmarks each time
- Treating a descriptive body-shape label like a health score or value judgment
- Pulling the tape tightly enough to compress the body or letting it tilt across the back
- Assuming a shape label predicts the size or fit of a particular garment brand
- Treating a cutoff as a natural boundary when nearby measurements are practically similar
Limitations
This calculator applies five fixed, ordered rules to positive bust, waist, and hip measurements. It does not convert units or verify measurement landmarks. It omits shoulders, rib cage, cup size, height, torso and leg length, posture, mobility, pregnancy, body composition, muscle distribution, breast tissue changes, surgery, transition, and age-related changes. Thresholds and labels are not standardized, and another system may classify the same measurements differently. A small tape or rounding difference can move a result across a cutoff. The category does not predict garment size, brand fit, health, fertility, fitness, attractiveness, or medical risk.
Embed this calculator on your site
Drop this single line where you want the calculator to appear. It is responsive, mobile-friendly, resizes automatically, and is free to use with attribution.
<script src="https://calctide.com/embed.js" data-tool="body-shape-calculator" async></script>Preview the embed at /embed/body-shape-calculator/.