Ten tools, one gentle picture
BMI Calculator
Calculate your Body Mass Index with visual category gauge, ideal weight range, and easy metric or imperial unit switching. A standard 10-second screening tool for general wellness orientation.
Body Fat Calculator
Go beyond BMI with Navy (Hodgdon-Beckett) and YMCA body fat estimation methods using simple circumference measurements. Track composition change when BMI alone does not tell the full story.
Ideal Weight Calculator
Compare four classic ideal weight reference formulas — Devine, Hamwi, Robinson, and Miller — side by side. Designed as reference ranges for dosing and context, never as personal finish lines.
LBM Calculator
Calculate your Lean Body Mass — the total weight of everything in your body except fat. Useful for setting accurate nutritional baselines and tracking muscle-preserving progress during weight loss.
WHR Calculator
Waist-to-Hip Ratio — a simple circumference-based indicator of fat distribution pattern. A complementary metric alongside BMI and body fat for a broader picture of metabolic health.
WHtR Calculator
Waist-to-Height Ratio — a quick circumference screening tool that some research suggests correlates with cardiometabolic risk. Uses only waist and height, no scale needed.
Body Shape Calculator
Identify your body shape category — pear, apple, hourglass, or rectangle — based on bust, waist, and hip circumference ratios. A descriptive reference, not a health diagnostic.
FFMI Calculator
Fat-Free Mass Index — an adjusted body composition metric that normalizes lean mass to height. Commonly used in athletic and clinical contexts where BMI alone may misclassify muscular individuals.
BSA Calculator
Body Surface Area — a clinical reference metric used in medical dosing and physiological indexing. Multiple formulas (Mosteller, Du Bois, Haycock) for cross-reference.
Weight Loss % Calculator
Track the percentage of body weight lost over any period. A more meaningful metric than absolute pounds or kilograms because it normalises for starting body size and makes progress comparable.
Body composition, compared
Short reads that untangle the metrics people mix up most.
BMI vs Body Fat
Height-to-weight screening vs actual body composition. Understand the difference, see a side-by-side comparison, and learn which metric is the right starting point for your next step.
Read CompareBMR vs TDEE
Resting metabolic baseline vs total daily energy expenditure. Understand the difference and learn how to use both for your wellness goals.
Read CompareIdeal Weight Formulas
Four classic ideal weight formulas compared side by side. Reference ranges, never personal finish lines.
ReadA number is a starting point, not a verdict
Body composition tools describe a snapshot, not a story. Your weight shifts with hydration, sleep, hormones and time of day — so a single reading is least useful in isolation and most useful as part of a gentle trend.
Use these calculators to notice patterns, not to grade yourself. The healthiest relationship with numbers is the one that leaves room for context, kindness and a conversation with a wellness professional who knows you.