Category
Body Metrics
Body composition metrics help you understand how your weight is distributed and what a healthy range looks like for your height and frame.
Body composition is more than a single number on a scale. Metrics like BMI, body fat percentage, lean mass, and waist-to-hip ratio each tell you something slightly different about your health. Use them together — never in isolation — and remember that no calculator replaces a conversation with a qualified clinician.
Calculators in this category
BMI Calculator
Estimate your Body Mass Index — a quick screening tool for whether your weight is in a healthy range for your height.
Body Fat Calculator
Estimate your body fat percentage using the U.S. Navy circumference method.
Ideal Weight Calculator
Estimate a healthy weight range for your height using several validated clinical formulas.
Lean Body Mass Calculator
Estimate the weight of everything in your body that isn't fat — muscle, bone, organs, and water.
Waist-to-Hip Ratio Calculator
Calculate the ratio of your waist to your hips — a useful indicator of where you carry fat.
Guides in this category
body · metrics · 7 min read
What Is BMI and How Is It Calculated?
Body Mass Index is the most widely used screening tool for adult weight status. Here's exactly what it measures and what it doesn't.
body · metrics · 6 min read
BMI vs Body Fat Percentage: What's the Difference?
BMI and body fat percentage often disagree. Here's why, and which one to trust in different situations.
body · metrics · 6 min read
Waist-to-Hip Ratio and Health Risk
Why where you carry fat may matter more than how much you weigh.
body · metrics · 6 min read
Ideal Weight Formulas Explained
Devine, Robinson, Miller, and Hamwi — where these formulas came from and which to use.
body · metrics · 6 min read
Body Fat Percentage Ranges for Adults
What ranges are considered essential, athletic, fit, average, and high — and why those labels are blunt instruments.