Free online body shape type calculator — find your body frame size and body shape instantly in inches or cm
A body type calculator is a free online tool that helps you determine two distinct things about your physique: your skeletal frame size (small, medium, or large, based on bone structure) and your body shape (how your bust, waist, and hip measurements compare to one another). This body shape type calculator works for both men and women and gives instant, accurate results using either inches or centimeters — no signup required.
Our body type calculator for women uses your bust, waist, and hip measurements to identify whether you're an Hourglass, Pear, Apple, Rectangle, or Inverted Triangle shape. This female body type calculator is one of the most searched tools online because clothing fit, style choices, and fitness planning all depend on knowing your natural shape. Simply select "Female" in the Body Shape tab and enter your measurements in inches or cm.
The same logic applies to our body type calculator for men — using chest, waist, and hip (or shoulder) measurements. A male body type calculator is commonly used to determine whether a man has a Rectangle, Inverted Triangle, Triangle, or Oval body shape, which is useful for tailoring workouts and choosing well-fitted clothing. Select "Male" in either tab to get results tailored to a male frame.
Frame size is calculated using your height-to-wrist ratio — this is why it's sometimes searched as an inch calculator body type tool. Simply divide your height by your wrist circumference (in the same unit):
Knowing your body type is one of the most practical steps you can take toward smarter fitness, nutrition, and wardrobe decisions. The free Body Type Calculator above tells you two important things: your body frame size (small, medium, or large, based on your height-to-wrist ratio) and your body shape (hourglass, pear, inverted triangle, rectangle, or apple, based on your bust, waist, and hip measurements). Unlike a bathroom scale, which reports only a single number, this calculator interprets how your weight is distributed across your skeleton — information you can actually act on when setting calories, choosing a training split, or buying clothes that flatter your proportions.
Body typing is not guesswork: it is a shortcut for applying well-established exercise science. Frame size reflects bone structure, which does not change in adulthood, while shape reflects soft tissue, which does. That distinction is the key insight behind everything that follows. Below you will find a complete, step-by-step guide to using the tool, an explanation of the three classical somatotypes, the exact classification formulas with worked examples, full diet and training scenarios with real numbers, and the five mistakes almost everyone makes the first time they measure.
Follow these steps in order for the most accurate result:
The modern idea of body typing goes back to the 1940s, when researcher William Sheldon proposed three fundamental somatotypes — categories describing the body’s natural tendencies toward fat storage, muscle building, and overall build. Sheldon’s original language was more extreme than today’s usage, but the three names he coined remain the standard vocabulary of fitness coaching:
Very few people are a pure type. Most of us are combinations — an “ecto-mesomorph” might have the narrow frame of an ectomorph with the muscle-building response of a mesomorph. Your somatotype describes where you fall on this spectrum, and it correlates with, but is not identical to, body composition — the actual ratio of fat mass to lean mass in your body right now. Somatotype is mostly genetic and relatively stable; body composition is a snapshot that changes with diet and training. Confusing the two is the root of most bad body-type advice: your frame will not change, but your composition absolutely can, which is why two people with the same somatotype can look very different.
Frame size (what the first calculator measures) is the closest measurable proxy for your somatotype’s skeletal component: wrist circumference relative to height is a field-friendly stand-in for bone thickness. Body shape (what the second calculator measures) is a snapshot of your current body composition and fat distribution. Together they give a fuller picture than either one alone, which is why this page includes both tools.
The calculator uses two transparent, repeatable formulas — no black boxes and no proprietary scores. You can verify every result by hand with the steps below.
Frame size is classified by dividing height in inches by wrist circumference in inches. For women, the standard cutoffs are: a ratio greater than 10.4 = small frame; 9.6 to 10.4 = medium frame; less than 9.6 = large frame. Men’s cutoffs shift upward slightly because male wrists are typically thicker relative to height.
Worked example A — female, small frame. Sarah is 5 ft 6 in tall (66 inches) with a 6.0-inch wrist. Her ratio is 66 ÷ 6.0 = 11.0. Since 11.0 is above 10.4, she has a small frame. In practice, this means her healthy weight range sits at the lower end of standard BMI tables — at a BMI of 22 she would weigh roughly 132 lb, whereas the same BMI on a large frame corresponds to more lean mass at a heavier weight.
Worked example B — female, large frame. Maria is 5 ft 4 in tall (64 inches) with a 7.0-inch wrist. Her ratio is 64 ÷ 7.0 ≈ 9.14. Since 9.14 is below 9.6, she has a large frame. Her skeleton carries more lean mass, so she should never compare her scale weight to Sarah’s: at the same body-fat percentage, Maria will weigh 8–12 lb more and be equally lean. The frame-size result protects both women from chasing someone else’s number.
Body shape is classified by comparing the three circumferences against one another. The calculator also computes the waist-to-hip ratio (waist ÷ hips) as a health marker: values above 0.85 for women or 0.90 for men are associated with higher cardiometabolic risk, regardless of shape. The shape logic itself is straightforward: bust and hips within about an inch of each other with a waist at least 8–9 inches smaller = hourglass; hips more than about 2 inches wider than bust = pear; bust more than about 2 inches wider than hips = inverted triangle; all three measurements within about 2 inches of one another = rectangle; waist wider than or roughly equal to bust and hips = apple.
Meet Daniel, a 32-year-old man who used the calculator and got: large frame, apple shape, waist 38 in, hips 36 in — a waist-to-hip ratio of 1.06. His profile is classic endomorph-leaning: he gains weight easily around the midsection, and his ratio sits above the 0.90 threshold for men, which makes fat loss both a cosmetic and a health goal.
Daniel’s maintenance calories, estimated from his 5 ft 10 in, 205 lb frame with a desk job and three gym sessions a week, come to roughly 2,600 kcal per day. For an endomorph-leaning apple shape, an aggressive deficit backfires because it costs disproportionate muscle, so he sets a moderate deficit of 500 kcal and targets 2,100 kcal per day — a sustainable pace of about 1 lb of fat loss per week.
His macros are built around protein first: 1 g per pound of goal body weight. His goal weight is 185 lb, so 185 g of protein per day (about 740 kcal). Fat is set at 0.4 g per pound of current body weight, which is 82 g (about 740 kcal). The remaining roughly 620 kcal comes from carbohydrates — about 155 g — timed mostly around workouts. Because apple-shaped endomorphs are more likely to be insulin resistant, Daniel places 60% of his carbs in the meals before and after training, keeps sugary drinks at zero, and walks 8,000 steps daily. After 12 weeks on this plan, a realistic outcome is 190–192 lb with the waist down to 35–36 in, bringing the ratio toward 0.97 — still above 0.90, but moving decisively in the right direction.
Now meet Priya, a 26-year-old woman who used the calculator and got: small frame, rectangle shape — bust 34 in, waist 29 in, hips 35 in. Her profile is ectomorph-leaning: 5 ft 7 in, 128 lb, and she struggles to gain muscle. Her rectangle shape means she wants to build curves through muscle rather than dieting, which would only make her smaller.
For an ectomorph, the classic training error is too much cardio and too little progressive overload. Priya’s plan uses four strength sessions per week on an upper/lower split, built around compound lifts — squat, hip thrust, Romanian deadlift, overhead press, and row — in the 6–10 rep range, adding a small amount of weight or one extra rep each week. Cardio is capped at two easy 20-minute sessions to protect recovery and keep her in a slight surplus.
Nutrition is the other half of the equation: at 128 lb with four training days, her maintenance is roughly 2,100 kcal, so she eats about 2,350 kcal per day — a modest surplus of 250 kcal — with protein at 0.8–1.0 g per pound of body weight (about 110–128 g daily). A realistic 16-week outcome for a small-framed ectomorph beginner is 3–5 lb of lean muscle gained: hips measuring 36–36.5 in from glute growth while the waist holds at 29 in — nudging her shape from rectangle toward hourglass, driven entirely by body composition change on a fixed frame.
Body type is one piece of the puzzle. Continue your assessment with these free tools:
This page provides a free body type calculator covering body frame size (height-to-wrist ratio) and body shape (bust–waist–hip comparison) for men and women, plus a 2,000+ word guide covering usage steps, somatotype theory (ectomorph, mesomorph, endomorph), classification formulas with worked examples, diet and training scenarios with real numbers, common measurement mistakes, and FAQs. Key entities: body frame size, body shape, somatotype, body composition, waist-to-hip ratio, height-to-wrist ratio.
Sources: standard anthropometric references for frame-size (height-to-wrist) thresholds and waist-to-hip ratio health cutoffs; somatotype theory (Sheldon, 1940s); general exercise-nutrition guidelines for calorie and protein targets.
Your frame size cannot change in adulthood — bone structure is fixed. Your body shape, however, changes whenever your body composition changes: losing 20 lb can move you from apple toward rectangle, and building glute muscle can move a rectangle toward an hourglass. Think of your somatotype as the canvas and your body composition as the painting.
The mesomorph typically builds muscle fastest, thanks to favorable hormone response, joint structure, and muscle-belly length. That said, training age and consistency matter far more: a disciplined ectomorph in year two of progressive training will be more muscular than a mesomorph who trains sporadically. Genetics set the rate; behavior sets the result.
An endomorph aiming to lose weight should eat in a moderate deficit of 300–500 kcal below maintenance, with protein at 0.8–1.0 g per pound of goal body weight to protect muscle, fiber-rich whole foods for satiety, and most carbohydrates placed around workouts. Avoid crash diets: they cost disproportionate muscle in endomorphs and rebound harder. See Practical Example 1 above for a complete worked plan.