身體總水分量計算器

用 Watson 方法估算體內水分

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性別

身體總水分量計算器

水分是人體單一成分中佔比最大的部分。本計算器使用經過驗證的 Watson 公式，依年齡、性別、身高和體重，以公升為單位並以佔體重的百分比估算您的身體總水分量（TBW）。TBW 通常約為體重的 50–65%，男性與體型偏瘦者較高，體脂越多則越低，因為脂肪幾乎不含水分。此數值在營養管理、腎臟照護和體液管理中常作為基準參考值。

採用 Watson 公式估算的結果。身體總水分量通常約為體重的 50–65%，男性與體型偏瘦者較高，體脂越多則越低。水分攝取需求及臨床應用請諮詢專業人士確認。

常見問題

What is total body water and why does it matter?
Total body water (TBW) is the total volume of fluid in your body, both inside and outside your cells. It's central to circulation, temperature control and nutrient transport, and typically makes up a little over half of adult body weight.
How is total body water calculated?
This calculator uses the Watson formula, which estimates TBW in litres from your age, sex, height and weight using sex-specific equations. Enter those four values and it returns your estimated litres of body water and that water as a percentage of body weight.
What percentage of body weight should be water?
Total body water is generally around 50–65% of body weight, typically near 50–55% for women and 55–65% for men, declining with age and higher body fat. Leaner, more muscular bodies hold a higher water percentage since muscle is water-rich.

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