Body & Weight

Understand your body composition: BMI, body fat by several methods, lean mass, ideal and healthy weight, and waist ratios.

18 free body & weight tools, no signup.

• Adjusted Body Weight CalculatorCalculate ideal and adjusted body weight from height, weight, and sex using the Devine formula. Used in clinical dosing for people above their ideal weight.
• Army Body Fat CalculatorEstimate body-fat percentage with the US Army AR 600-9 tape method from a few measurements in inches. Free and private.
• BMI CalculatorFind your body mass index from height and weight, in metric or imperial units, with the standard weight category. Free and instant.
• BMI Calculator for MenCalculate BMI for men from height and weight, in metric or imperial units, with the standard weight category.
• BMI Calculator for WomenCalculate BMI for women from height and weight, in metric or imperial units, with the standard weight category.
• Body Fat CalculatorEstimate body-fat percentage with the US Navy tape method from a few measurements, plus the fitness category it falls in. Free and private.
• Body Surface Area (BSA) CalculatorCalculate body surface area from height and weight using the Mosteller and Du Bois formulas. Reports BSA in square meters, the value used for dosing and clinical indexing.
• FFMI CalculatorCalculate your Fat-Free Mass Index (FFMI) and normalized FFMI from your weight, height, and body fat percentage. A muscularity score that BMI cannot give.
• Goal Weight Date CalculatorProject the date you reach your goal weight from a steady weekly loss rate, plus the daily calorie deficit it takes. Free and private.
• Healthy Weight Range CalculatorFind your healthy weight range by height using the WHO normal BMI band of 18.5 to 25. Metric or imperial. Free.
• Ideal Weight CalculatorEstimate a healthy target weight for your height using the Devine, Robinson, Miller, and Hamwi formulas. Results in kilograms, free and instant.
• Lean Body Mass CalculatorEstimate lean body mass in kilograms using the Boer, James, and Hume formulas. Free and accurate.
• Navy Body Fat CalculatorEstimate body fat with the US Navy tape method. Enter height, neck, and waist in cm (plus hip for women) for a body-fat percentage.
• Relative Fat Mass CalculatorEstimate body fat percentage from height and waist using the Relative Fat Mass (RFM) formula. No calipers needed.
• Skinfold Body Fat CalculatorEstimate body fat from three caliper skinfold measurements using the Jackson-Pollock formula. Men use chest, abdomen, and thigh; women use triceps, suprailiac, and thigh.
• Waist to Height Ratio CalculatorCalculate your waist-to-height ratio and see the health band it falls into. Keep your waist under half your height. Free and private.
• Waist to Hip Ratio CalculatorCalculate your waist-to-hip ratio and see the WHO risk category. Enter your waist and hip measurements for an instant result. Free and private.
• Weight Loss Percentage CalculatorSee how much weight you have lost and what percent of your starting weight that is, in pounds or kilograms. Track progress toward the 5% and 10% milestones that matter for health.