Most Popular Body Metrics & Weight Calculators
Weight Loss Calculator by Date
Free weight loss calculator by date with timeline milestones. Set a goal weight and pace or target date to see your finish date, deficit and BMI change.
Muscle Mass Calculator
Calculate skeletal muscle mass with our free muscle mass calculator. Enter weight and body fat % to see SMM, lean mass, fat mass, SMI, and body composition.
Obesity Calculator
Free obesity calculator shows your BMI obesity class (1, 2, or 3) using WHO cutoffs. See weight ranges, body fat estimate, and a plan to reach a healthy BMI.
Weight Loss Calorie Calculator
Free weight loss calorie calculator to find your calorie deficit for weight loss. Estimates BMR, TDEE, target intake, macros, and a timeline to your goal.
Weight Loss Percentage Calculator
Free weight loss percentage calculator. Enter your starting and current weight to see percent lost, total change in kg/lb, weekly pace, and goal timeline.
Child BMI Calculator
Free CDC child BMI calculator for ages 2-20. Enter height, weight, age, and sex to get BMI percentile, z-score, weight category, and healthy range instantly.
All Body Metrics & Weight Calculators
ABSI Calculator
Free ABSI calculator computes A Body Shape Index from waist, height, and BMI to estimate visceral fat and mortality risk independent of body mass index.
Adult BMI Calculator for Men & Women
Use the adult BMI calculator to find your BMI with WHO categories. Enter metric or imperial units to see your status and BMI ranges quickly and clearly.
Army Body Fat Calculator
Check compliance with the Army body fat calculator per AR 600-9 standards. Enter circumference measures by sex to estimate body fat % and see pass/fail status.
Body Adiposity Index Calculator (BAI)
Free body adiposity index calculator estimates body fat percentage from hip circumference and height using the BAI formula, no weight or scale needed.
Body Composition Calculator
Use our body composition calculator to estimate body fat percentage, fat mass, and lean mass from tape measurements. Switch units and get clear categories.
Body Fat Calculator
Estimate with the body fat percentage calculator (body fat calculator) using Navy circumference equations. Supports metric/imperial and sex‑specific inputs.
Body Measurement Calculator
Use our body measurement calculator to capture wrist, waist, hip, and height. View WHR, WHtR, and a wrist-based frame size hint with metric/US units and labels.
Body Roundness Index Calculator (BRI)
Estimate adiposity from height and waist with our body roundness index calculator. Get your BRI value and interpretive ranges for clear health risk context.
Body Shape Calculator & Guide Based on Measurements
Discover your proportions with our body shape calculator. Enter bust, waist, and hip measurements to classify your shape and get style and fitness tips.
Body Type Calculator
Use our body type calculator to identify ectomorph, mesomorph, or endomorph tendencies. Get practical training and nutrition guidance for your somatotype.
BSA Calculator
Free BSA calculator with Mosteller, Du Bois, and Haycock formulas. Calculate body surface area in m² for chemotherapy dosing and medication protocols.
Child BMI Calculator
Free CDC child BMI calculator for ages 2-20. Enter height, weight, age, and sex to get BMI percentile, z-score, weight category, and healthy range instantly.
Conicity Index Calculator
Free conicity index calculator measures central obesity from waist, weight, and height, scoring how cylindrical your body shape is for cardiovascular risk.
FFMI Calculator
Calculate muscularity with the FFMI calculator. Input body weight, height, and body fat % to compute FFMI, then compare with sex-specific reference ranges.
Frame Size Calculator
Frame size calculator to classify your build as small, medium, or large using wrist circumference and height — fast results and helpful weight context today.
Healthy Weight Range Calculator
Find your healthy weight range by height with our healthy weight range calculator. See BMI 18.5–24.9 targets, midpoint goal, and metric/US unit support.
Ideal Body Weight Calculator
Find your IBW with the ideal body weight calculator (IBW calculator) using Devine, Robinson, Hamwi, and Miller formulas. Adjust for height, sex, and frame size.
Lean Body Mass Calculator (LBM)
Use the lean body mass calculator to estimate fat‑free mass (LBM) with Boer, James, Hume, and Janma formulas. Compare results, switch units, and see LMI.
Muscle Mass Calculator
Calculate skeletal muscle mass with our free muscle mass calculator. Enter weight and body fat % to see SMM, lean mass, fat mass, SMI, and body composition.
Navy Body Fat Calculator
Use our Navy body fat calculator to estimate body fat with the official U.S. Navy tape test. Enter neck, waist, height, and hips (women). See age limits.
Obesity Calculator
Free obesity calculator shows your BMI obesity class (1, 2, or 3) using WHO cutoffs. See weight ranges, body fat estimate, and a plan to reach a healthy BMI.
Overweight Calculator
Use our overweight calculator to check BMI using WHO cutoffs. Enter height and weight in metric or US units to see category, health context, and target range.
Ponderal Index Calculator
Free ponderal index calculator computes weight in kg divided by height cubed, a height-stable leanness measure for tall, short, and newborn bodies alike.
Relative Fat Mass Calculator (RFM)
Free relative fat mass calculator estimates body fat percentage from height and waist with the validated RFM formula, a simpler, more accurate BMI alternative.
Reverse BMI Calculator
Free reverse BMI calculator to find the exact weight for any target BMI and height. Set BMI goals, compare thresholds, and plan your path to a healthy weight.
Skeletal Muscle Mass Percentage Calculator by Age and Sex
Free skeletal muscle mass percentage calculator to check your SMM against healthy ranges by age and sex. Interpret InBody, DEXA, or smart scale results.
Waist to Height Ratio Calculator (WHtR)
Use our waist to height ratio calculator (WHtR) to screen adiposity risk. Enter height and waist in metric or US to see WHtR, risk band, and waist target.
Waist to Hip Ratio Calculator (WHR) for Health Risk
Calculate WHR with our waist to hip ratio calculator. Enter waist and hip measurements to see category and cardiometabolic risk ranges for men and women.
Weight Gain Calculator for Bulking and Muscle Building
Use our weight gain calculator to set a safe calorie surplus, estimate daily calories and macros, and plan a realistic timeline to gain weight steadily.
Weight Loss Calorie Calculator
Free weight loss calorie calculator to find your calorie deficit for weight loss. Estimates BMR, TDEE, target intake, macros, and a timeline to your goal.
Weight Loss Calculator by Date
Free weight loss calculator by date with timeline milestones. Set a goal weight and pace or target date to see your finish date, deficit and BMI change.
Weight Loss Percentage Calculator
Free weight loss percentage calculator. Enter your starting and current weight to see percent lost, total change in kg/lb, weekly pace, and goal timeline.
Wrist Size Calculator
Free wrist size calculator to find your body frame size from wrist circumference and height. Get instant small, medium, or large frame classification.
Total Tools
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Why Use Our Body Metrics & Weight Calculators?
Our body metrics and weight calculator collection includes 33 specialized tools that help you measure BMI, body fat percentage, ideal body weight, body surface area (BSA), and weight loss timelines. Each calculator uses clinically validated formulas — including the Mifflin-St Jeor equation, Devine formula, and CDC BMI classifications — to deliver accurate results you can discuss with your healthcare provider.
Who Are These Calculators For?
These tools are designed for anyone tracking body composition changes, planning weight loss goals, or monitoring fitness progress. Healthcare professionals use our BMI and BSA calculators for clinical assessments, while fitness enthusiasts rely on body fat and muscle mass calculators for training insights.
How Our Calculators Work
Enter your measurements — height, weight, age, and gender — and get instant results with clinical interpretations. All calculations happen in your browser using peer-reviewed formulas. No data is stored or transmitted, ensuring complete privacy.
Key Benefits
- Medical-grade accuracy based on WHO and CDC guidelines
- Instant results with detailed explanations and recommendations
- 100% private — all calculations run locally in your browser
- No registration, no personal data collected
Frequently Asked Questions
How accurate are online BMI and body fat calculators?
What is a healthy BMI range for adults?
How do I calculate my ideal body weight?
Can I use these calculators to plan a weight loss timeline?
What is body surface area (BSA) and why does it matter?
Explore More Health Calculators
Discover our complete collection of 304 health calculators across 9 categories