HesapHanem

Body Water Calculator

Find your total body water.

Result

35.00 L
50.00%

How it is calculated

The tool estimates total body water as a fixed share of body weight: water (L) = weight (kg) × percentage / 100, with 60% used for males and 50% for females. Because 1 litre of water weighs about 1 kg, kilograms of water and litres are treated as equal. Weight must be greater than zero. The percentage is a population average, not a measurement: real values vary with age, body fat and muscle, since fat tissue holds much less water than lean tissue. Use the result as a rough estimate, not as a clinical reading. The litres are shown to two decimals, together with the percentage applied.

Worked example

A female with a body weight of 70 kg is entered. The tool uses 50% for females. Water = 70 × 50 / 100 = 35.00 L. The percentage shown beside it is 50.00%. For a male of the same weight the share would be 60%, giving 42 L, which shows how much the sex setting alone changes the estimate.

Try this example →

Common mistakes

  • Entering weight in pounds; the formula expects kilograms.
  • Reading the result as the amount of water you should drink per day. It is the water already in the body.
  • Expecting a precise value for athletes or people with high body fat, since only sex and weight are used.
  • Leaving the sex setting on the default and getting a figure 10 percentage points off.

Sources

About this calculator

This calculator estimates total body water (TBW) — the amount of fluid inside cells, blood and tissue — as a fixed share of body weight: 60% for men and 50% for women, the typical averages that reflect men's usually higher muscle-to-fat ratio. Muscle tissue holds far more water than fat tissue, so your real share can differ from these averages; the tool uses only weight and sex, not height, age or body composition.

Athletes and coaches monitoring hydration status around training, dietitians assessing a client's fluid balance, and anyone tracking body composition changes alongside weight loss use this figure as a baseline, since body water percentage shifts noticeably as fat and muscle mass change even when total weight stays the same.

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Comments (1)

  • Editorial team

    The share is fixed by sex alone, so two adults of the same weight get identical answers, which is why this is only a rough reference. One practical use is tracking fluid loss around exercise: weigh yourself before and after a session, and each kilogram lost is roughly a litre of fluid to replace, which you can set against the total shown here. For anything health-related, a clinician's measurement beats this estimate. What are you using the number for, training or general curiosity?

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