Water is the single biggest ingredient of human body. The weight of water in the body of an individual as a percentage of total body weight can vary from 45% to 75%. On average adult male body contains about 60% water by weight. This figure is 55% for females.
Percentage of water in some of the parts of the body are as follows:
Lean muscle tissues : 75%
Blood : 95%
Fat : 14%
The total body water can be divided in two categories:
- Intracellular Fluid: This constitutes about two thirds of total body water.
- Extracellular Fluid: This constitutes about one third of total body water.
On an average by weight the pecentage of water in human body is as follows. Generally male and female bodies vary slightly to the extent of 5% less in females.
Traces of other elements are also there.
The maximum variations of percentage of water in individuals is on account of the fat contents of water.
I think 75% nearly.