Body & Weight Calculators
📘 How to Interpret Your Results
- Body Mass Index (BMI): Estimates body fat based on weight and height.
Under 18.5: Underweight | 18.5–24.9: Normal | 25–29.9: Overweight | 30+: Obese - Body Surface Area (BSA): Total skin area of your body; used in medical dosing.
Normal adult range: 1.6–2.0 m² - Ponderal Index (PI): Similar to BMI but more accurate for tall or short individuals.
Healthy: 12–15 (varies by build) - Lean Body Mass (LBM): Your body weight minus fat (muscle, organs, bones, water).
Higher is better for athletes and strength goals. - Fat-Free Mass Index (FFMI): LBM adjusted for height; used by fitness experts.
Above 19: Fit | Above 22: Very muscular - Fat Mass (FM): The total weight of fat in your body.
Helps estimate ideal fat-loss targets. - Basal Metabolic Rate (BMR): Calories your body burns at rest.
Use to estimate daily calorie needs (multiply by 1.2–1.9 based on activity). - Ideal Body Weight (IBW): Theoretical optimal weight based on height and gender.
Not strict, but helpful for target setting. - Waist-to-Hip Ratio (WHR): Fat distribution; related to heart disease risk.
Men: < 0.90 | Women: < 0.85 is considered low risk. - Waist-to-Height Ratio (WHtR): Fat distribution and cardiovascular risk.
Healthy: Keep waist less than half your height (WHtR < 0.5). - Body Adiposity Index (BAI): Fat % based on hip size and height.
Rough estimate when fat % is not known. Useful without weight info. - Relative Fat Mass (RFM): Newer method to estimate body fat using waist and height.
More accurate than BMI in many cases. Ideal: Men: 6–24%, Women: 14–31%
