Total Body Water
Estimate total body water in litres and as a percentage of body weight using the Watson formula, free online.
About this calculator
The Watson formula estimates total body water (TBW) from age, height and weight. Men: 2.447 − 0.09156·age + 0.1074·height(cm) + 0.3362·weight(kg). Women: −2.097 + 0.1069·height + 0.2466·weight. Healthy adults are roughly 50–65% water. This is general information, not medical advice.