What is hydrostatic weighing?

Hydrostatic weighing, also known as underwater weighing, is a method of measuring body composition.  A person would first be weighed on a dry scale, and then placed into a water tank and weighed again under water.  Since lean tissue is more dense than fat, the more lean tissue a person has, the more they will weigh under water.  The proportion of fat vs. lean tissue could be calculated from this measurement.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.