Body Type Calculator

What Is Somatotyping?

Somatotyping is a system of classifying human body types developed by psychologist William Sheldon in the 1940s. Sheldon proposed that every person falls somewhere on a spectrum of three fundamental body types. While his original theory tied body shape to personality — an idea modern science has thoroughly debunked — the physical classification system itself remains a useful shorthand for understanding how different bodies tend to respond to training and nutrition.

It is important to recognize that somatotyping describes tendencies, not fixed destinies. Your genetics influence your starting point, but your training, diet, and lifestyle habits determine where you end up. No one is locked into a single category forever.

The Three Body Types

• Ectomorph: Naturally lean and long-limbed with a fast metabolism. Ectomorphs tend to have narrow shoulders and hips, lower body fat, and find it difficult to gain weight — whether muscle or fat. They often excel at endurance sports.
• Mesomorph: Naturally muscular and medium-framed. Mesomorphs gain muscle relatively easily, respond quickly to resistance training, and carry a moderate amount of body fat. They often have broader shoulders and a naturally athletic build.
• Endomorph: Wider build with a tendency to store more body fat, especially around the midsection. Endomorphs often have strong lower bodies and can build impressive strength, but may find fat loss requires more deliberate attention to diet.

Most People Are a Blend

Very few individuals fit neatly into a single category. Most people display a combination of traits — you might have the narrow shoulders of an ectomorph but the hip width and fat storage pattern of an endomorph, for example. Think of the three types as points on a triangle rather than rigid boxes. Your blend can also shift over time as your body composition changes through training and nutrition.

Training Recommendations by Type

• Ectomorphs: Focus on compound lifts with heavier weights and moderate volume. Limit excessive cardio that burns calories you need for muscle growth. Prioritize progressive overload and adequate rest between sessions.
• Mesomorphs: Respond well to a balanced mix of strength training and conditioning. Can handle higher training volume and variety. A combination of heavy compound lifts and hypertrophy work tends to produce excellent results.
• Endomorphs: Benefit from a combination of resistance training to build lean body mass and regular cardiovascular exercise to support fat management. Circuit training and supersets can keep intensity high while burning more calories.

Nutrition Considerations by Type

• Ectomorphs: Often need a calorie surplus to gain weight. Higher carbohydrate intake supports energy for training and recovery. Eating more frequently throughout the day can help hit calorie targets.
• Mesomorphs: A balanced macro split (roughly 40% carbs, 30% protein, 30% fat) tends to work well. Adjust based on whether the goal is gaining muscle or losing fat.
• Endomorphs: May benefit from slightly higher protein and fat with moderate carbohydrates, as some endomorphs are more sensitive to carbohydrate-heavy diets. Paying close attention to portion sizes is especially important.

Body Type Does Not Determine Destiny

Your body type is a starting point, not a life sentence. An ectomorph can absolutely build significant muscle mass with consistent training and proper nutrition. An endomorph can achieve a lean, athletic physique with the right dietary strategy and exercise routine. The key is understanding your natural tendencies so you can tailor your approach rather than fighting against your body.

Related Calculators

Find out your current body composition with the Lean Body Mass Calculator, or set up your daily nutrition targets with the Macro Calculator.