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Know your body.
⚖️ Body Composition
Know your body.
Beyond the scale.
Calculators for BMI, body fat percentage, ideal weight, lean body mass, and reverse BMI. Understand what your body composition numbers actually mean — and what a healthy target looks like for your height and frame.
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Body Composition Calculators
BMI, body fat, weight targets, and lean mass tools
📊Popular
BMI Calculator
Calculate your Body Mass Index from height and weight — with category, healthy weight range, and plain-English interpretation.
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🎯New
Reverse BMI Calculator
Find the weight you need to reach a target BMI — useful for weight loss or gain goal-setting.
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🔬Popular
Body Fat Percentage Calculator
Estimate body fat percentage using measurements — with category classification and fitness benchmarks.
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⚖️Popular
Ideal Weight Calculator
Calculate your healthy weight range using multiple formulas — Hamwi, Devine, Robinson, and Miller.
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💪Fitness
Lean Body Mass Calculator
Calculate your lean mass — the fat-free portion of your body weight — for training and nutrition planning.
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👶Paediatric
BMI for Age Calculator
Calculate BMI percentile for children and teenagers using CDC growth charts — ages 2–19.
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🏥Medical
Breast Weight Calculator
Estimate breast weight by bra size — used in surgical consultations and postural load assessments.
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Related Guides
Body composition concepts explained step-by-step