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Get an estimate of your body's lean mass by entering your height and weight. This calculator uses the James formula which applies to adults and children of all ages. Your lean body mass is the sum of all your nonfat parts including muscle, tissue, organs, blood, and water. Don't confuse lean body mass with ideal weight - essential fat is 10% for women and 2% for men, and acceptable fat is up to 31% for women and 25% for men.

Input Fields:
Title A title for these calculator results that will help you identify it if you have printed out several versions of the calculator.
US/Metric Choose US or Metric units.
Gender Select your gender.
Weight Your current scale weight.
Height Your height. Use feet (ft) and inches (in) if units is US or centimeters (cm) if units is Metric.

Output Fields:
Lean Mass The portion of your weight that is lean (not fat).
Fat Mass The portion of your weight that is fat.

Buttons and Checkboxes:
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All calculators are made available as self-help tools for your independent use with results based on information provided by the user. All examples are hypothetical and are for illustrative purposes only. Calculated results are believed to be accurate but results are not guaranteed. Exercise, Fitness, Health, and Weight Loss calculators are not for providing medical advice and should not be used as a substitute for advice from a medical professional. Users are advised to check with a physician before undertaking any strenuous exercise or diet plan.
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Updated 04 Jul 2007