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How Much Of Your Body Is Water?

by Anne Marie Helmenstine, Ph.D.

Updated March 14, 2018

Have you ever wondered how much of your body is water? The percentage of water varies according to your age and gender. Here's a look at how much water is inside you.

The amount of water in the human body ranges from 50-75%. The average adult human body is 50-65% water, averaging around 57-60%. The percentage of water in infants is much higher, typically around 75-78% water, dropping to 65% by one year of age.

Body composition varies according to gender and fitness level because fatty tissue contains less water than lean tissue. The average adult male is about 60% water. The average adult woman is about 55% water because women naturally have more fatty tissue than men. Overweight men and women have less water, as a percent than their leaner counterparts.

  • Babies and children have the highest percentage of water.

  • Adult men contain the next highest level of water.

  • Adult women contain a lower percentage of water than babies or men.

  • Obese men and women have less water, as a percentage than lean adults.

The percent of water depends on your hydration level. People feel thirsty when they have already lost around 2-3% of their body's water. Mental performance and physical coordination start to become impaired before thirst kicks in, typically around 1% dehydration.

Although liquid water is the most abundant molecule in the body, additional water is found in hydrated compounds.

About 30-40% of the weight of the human body is the skeleton, but when the bound water is removed, either by chemical desiccation or heat, half the weight is lost.

Tongfang Health Technology (Beijing) Co.,Ltd