Total Body Water % Measurement

Total Body Water % is the total amount of fluid in the body expressed as a % of total body weight (applicable for ages 18-99). Body water levels naturally fluctuate through out the day. Bodies tend to be dehydrated after a long night sleep and there are difference in fluid distribution between parts of the day. Body water % should act as a guide and should not be used as an absolute. It is meant to be used to track long-term changes in the total body water % and maintain a consistent, healthy body water %.

The average TBW% ranges for a healthy person are: 45 to 60% for females and 50 to 65% for males

Note: Total body water % will tend to decrease as the percentage of body fat increases. A person with a high % of body fat may fall below the average body water %. As you lose body fat, the total body water % should gradually move toward the average range.