Body Water Calculator – How Much Water Is in Your Body?
The body water calculator estimates your body's water content based on age, weight, height, and gender. The result shows how many liters of water are in your body and whether it's within normal ranges.
An adult human body is 50-70% water by weight. Water content decreases with age and varies with muscle mass — muscle cells contain more water than fat cells. The Watson formula is commonly used for estimation.
How Much Water Do You Need Daily?
The European Food Safety Authority (EFSA) recommends about 2 liters for adult women and 2.5 liters for adult men of total fluid intake daily from all sources. Heat, exercise, and illness increase fluid needs. The body water calculator helps you understand why adequate hydration is important.
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Browse all tools →The body water calculator estimates body water percentage based on age, weight, and gender. An illustrative tool for those who want to understand the importance of fluid balance.
Enter your basic information and the calculator will estimate your body's water content as a percentage and in liters.
- Estimates total body water as percentage and liters.
- Shows typical water content reference values for your age group.
- Compare your result to general recommendations.
Water content is an estimate – the actual value depends on body composition and many factors.
- Adult bodies typically contain 50-65% water – values vary individually.
- Muscle tissue contains more water than fatty tissue.
- Fluid needs increase in heat, during exercise, and when ill.
The calculator provides a statistical estimate and does not measure actual fluid balance.
- Measuring actual water content requires body composition analysis.
- Adequate water intake is important – thirst is the simplest guide.
- Discuss any health concerns with a doctor.