Army Body Fat Calculator
Calculate your body fat percentage using the U.S. Army tape test method (AR 600-9). Determine if you meet military body composition standards.
Free Body Composition Calculators
27 toolsBody fat percentage, lean mass, FFMI, and muscle mass calculators. Browse our free body composition tools below — no sign-up required.
BMI Calculator for Kids
Calculate BMI for children ages 2–20 with CDC growth chart percentiles. Determine weight status using age-and-sex-specific pediatric standards.
BMI Calculator for Men
Calculate your BMI with male-specific interpretation, healthy weight range, estimated body fat, waist circumference risk, and calorie needs.
BMI Calculator for Teenagers
Calculate BMI for teenagers 13–19 with CDC age-and-sex-specific percentiles, weight status classification, and growth chart reference data.
BMI Calculator for Women
Calculate BMI for women with female-specific body fat estimation, waist-to-hip ratio, cardiovascular risk assessment, healthy weight range, and calorie needs.
BMI in Pregnancy Calculator
Calculate your pre-pregnancy BMI and track recommended weight gain by gestational week using IOM and ACOG guidelines for healthy pregnancy.
BMI Weight Loss Goal Calculator
Set a target BMI and calculate exactly how much weight to lose, how long it will take, and the daily calorie deficit needed to reach your goal safely.
Body Adiposity Index (BAI) Calculator
Calculate your Body Adiposity Index to estimate body fat percentage without a scale. Uses hip circumference and height with the original Bergman formula.
Body Density Calculator
Calculate body density from skinfold measurements and convert to body fat percentage using the Siri and Brozek equations.
Body Fat Calculator (3-Site Skinfold)
Estimate body fat percentage using the Jackson-Pollock 3-site skinfold method. Enter caliper measurements from three body sites for an accurate body composition estimate.
Body Fat Calculator (7-Site Skinfold)
Estimate body fat percentage with the Jackson-Pollock 7-site skinfold method. The most comprehensive caliper test using chest, midaxillary, triceps, subscapular, abdomen, suprailiac, and thigh.
Body Fat Calculator (Navy Method)
Free body fat percentage calculator using the U.S. Navy method. Estimate body fat from neck, waist, and hip circumference measurements — no special equipment needed.
Body Shape Calculator
Determine your body shape type — hourglass, pear, apple, rectangle, or inverted triangle — using bust, waist, and hip measurements with health risk analysis.
Body Surface Area (BSA) Calculator
Calculate body surface area using six formulas — Du Bois, Mosteller, Haycock, Boyd, Gehan, Fujimoto — with comparison table and clinical dosing reference.
Body Water Percentage Calculator
Estimate total body water with the Watson formula. View body-water percentage plus approximate intracellular and extracellular fluid splits for reference.
FFMI Calculator — Fat-Free Mass Index
Calculate your Fat-Free Mass Index (FFMI) and normalized FFMI to assess muscularity relative to height. Scores above 25 are extremely rare for natural athletes. Includes classification table.
Gastric Sleeve Weight Loss Calculator
Project expected weight loss after vertical sleeve gastrectomy (VSG) by month — %EWL, %TWL, projected BMI, timeline, and comorbidity resolution rates.
Geriatric BMI Calculator
BMI calculator for adults 65+ with geriatric-specific ranges, obesity paradox context, mortality risk table, frailty screening, and protein/calorie targets for elderly.
Healthy Weight in Pregnancy Calculator
Track pregnancy weight-gain ranges using IOM guidance, with weekly targets, calorie context by trimester, gain status, and a reference breakdown of common weight components.
Height Estimation Calculator for Bedridden Patients
Estimate adult height from knee height, arm span, ulna length, or demispan when standing measurement is not available.
Lean Body Mass Calculator
Calculate your lean body mass using 3 established formulas (Boer, Hume, James). Compare results to understand your fat-free weight including muscle, bone, and organs.
Maximum Muscular Potential Calculator
Compare several popular natural-muscle-potential heuristics based on height, frame size, and training age. These outputs are rough ceilings, not validated individualized limits.
Overweight & Obesity Risk Calculator
Comprehensive overweight assessment with BMI, waist circumference risk, healthy weight range, 5% and 10% weight loss benefits, disease risk table, and calorie deficit planning.
Relative Fat Mass (RFM) Calculator
Calculate Relative Fat Mass from height and waist circumference using the original Woolcott and Bergman formula. RFM is a waist-based estimate of body fat percentage, not a direct measurement.
Skeletal Muscle Mass Calculator
Estimate skeletal muscle mass with the Lee et al. equation using sex, age, height, weight, and ethnicity inputs.
Visceral Fat Estimate Calculator
Estimate a waist/BMI/age-based visceral-fat proxy score and review abdominal-risk context from common waist thresholds.
Weight Week-by-Week Planner
Plan your weight loss or gain with a week-by-week timeline showing adaptive calorie targets, BMI changes, milestones, and rate sustainability guidance.