Are you naturally slim and struggle to gain weight? Stocky and muscular without much effort? Or do you gain weight easily and find it hard to lose? Your body type (somatotype) influences how you respond to diet and exercise — and understanding it helps you train and eat more effectively.
The CalcHub Body Type Calculator determines your somatotype from body measurements.
The Three Body Types
| Feature | Ectomorph | Mesomorph | Endomorph |
|---|
| Build | Slim, lean, long-limbed | Athletic, muscular, medium frame | Wider, softer, stores fat easily |
| Shoulders | Narrow | Broad | Medium to wide |
| Waist | Narrow | Medium | Wider |
| Wrist size | Small (< 16.5 cm men) | Medium (16.5–19 cm) | Large (> 19 cm) |
| Metabolism | Fast | Moderate | Slow |
| Muscle gain | Difficult | Easy | Moderate |
| Fat gain | Difficult | Moderate | Easy |
| Fat loss | Easy | Easy | Difficult |
Quick Self-Assessment
Wrist Measurement Method
Wrap your thumb and middle finger around the opposite wrist:
| Result | Likely Type | Men's Wrist | Women's Wrist |
|---|
| Fingers overlap | Ectomorph | < 16.5 cm (6.5") | < 14 cm (5.5") |
| Fingers just touch | Mesomorph | 16.5–19 cm (6.5–7.5") | 14–16.5 cm (5.5–6.5") |
| Fingers don't touch | Endomorph | > 19 cm (7.5") | > 16.5 cm (6.5") |
Frame Size by Height and Wrist
| Height (Men) | Small Frame | Medium Frame | Large Frame |
|---|
| Under 165 cm | Wrist < 16.5 cm | 16.5–17 cm | > 17 cm |
| 165–175 cm | < 17 cm | 17–18 cm | > 18 cm |
| Over 175 cm | < 17.5 cm | 17.5–19 cm | > 19 cm |
Training by Body Type
Ectomorph Training
| Principle | Recommendation |
|---|
| Goal | Build muscle mass |
| Rep range | 6–10 reps (heavy, compound lifts) |
| Volume | Moderate (not excessive) |
| Cardio | Minimal (2× per week, 20 min max) |
| Rest between sets | 2–3 minutes |
| Training frequency | 3–4 days per week |
| Focus | Squats, deadlifts, bench press, rows |
Mesomorph Training
| Principle | Recommendation |
|---|
| Goal | Maintain/build muscle, manage fat |
| Rep range | 8–12 reps (moderate weight) |
| Volume | Moderate to high |
| Cardio | 2–3× per week, 20–30 min |
| Rest between sets | 60–90 seconds |
| Training frequency | 4–5 days per week |
| Focus | Mix of compound and isolation exercises |
Endomorph Training
| Principle | Recommendation |
|---|
| Goal | Fat loss while preserving muscle |
| Rep range | 10–15 reps (moderate weight, higher intensity) |
| Volume | Higher (more total work) |
| Cardio | 3–5× per week, 30–45 min |
| Rest between sets | 30–60 seconds |
| Training frequency | 4–5 days per week |
| Focus | Circuit training, supersets, compound movements |
Nutrition by Body Type
Ectomorph Nutrition
| Macro | Percentage of Calories | Focus |
|---|
| Carbs | 50–60% | High carbs fuel training |
| Protein | 25–30% | 1.8–2.2g per kg bodyweight |
| Fat | 15–20% | Healthy fats for calories |
| Calorie target | TDEE + 300–500 | Must eat in surplus to gain |
| Meal frequency | 5–6 meals/day | Hard to eat enough in 3 meals |
Mesomorph Nutrition
| Macro | Percentage of Calories | Focus |
|---|
| Carbs | 40% | Moderate carbs |
| Protein | 30% | 1.6–2.0g per kg |
| Fat | 30% | Balanced fat intake |
| Calorie target | TDEE ± 200 | Adjust based on goal |
| Meal frequency | 4–5 meals/day | Standard approach |
Endomorph Nutrition
| Macro | Percentage of Calories | Focus |
|---|
| Carbs | 25–35% | Lower carbs (focus on complex) |
| Protein | 35–40% | 2.0–2.4g per kg (high priority) |
| Fat | 25–35% | Moderate healthy fats |
| Calorie target | TDEE − 300–500 | Deficit for fat loss |
| Meal frequency | 3–4 meals/day | Controlled eating windows help |
The Reality: Most People Are Mixed
Pure ectomorphs, mesomorphs, and endomorphs are rare. Most people are a blend:
| Common Blend | Characteristics |
|---|
| Ecto-mesomorph | Lean and athletic, gains muscle moderately |
| Meso-endomorph | Muscular but gains fat if not active |
| Ecto-endomorph | Slim limbs but carries fat around midsection |
Body type is a starting point, not a destiny. An endomorph who trains consistently and eats well will be fitter and healthier than a mesomorph who doesn't. Genetics load the gun; lifestyle pulls the trigger.
How to Use the Calculator
- Open the CalcHub Body Type Calculator
- Enter height, weight, wrist circumference
- Optionally enter shoulder width, waist, hip measurements
- See: your primary body type, secondary characteristics, and personalized training/nutrition recommendations
Can you change your body type?
You can't change your skeletal frame (wrist size, shoulder width), but you can dramatically change your muscle mass and body fat through training and nutrition. An endomorph can become lean and muscular; an ectomorph can build significant size. The underlying frame type remains, but the visible result changes enormously.
Is the somatotype system scientifically valid?
The original Sheldon classification (1940s) has been largely debunked as pseudoscience in its original personality-linked form. However, the basic observation that people have different body proportions, metabolisms, and responses to training IS supported by modern exercise science. Use body type as a rough guide, not a rigid classification.
Which body type is "best"?
None. Each has advantages: ectomorphs excel in endurance sports, mesomorphs in power sports, endomorphs in strength sports. For general health, any body type can achieve excellent fitness with appropriate training and nutrition.