Body Water Percentage Calculator

Body Water Percentage is evaluated from Sex, Age and Weight. The calculation reports Total Body Water, Body Water% and Hydration Status.

Results

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About the Body Water Percentage Calculator

Body Water Percentage is treated here as a quantitative relation between Sex, Age, Weight and Height and Total Body Water, Body Water% and Hydration Status.

The calculator uses a multi formula configuration. Each reported value is read as a direct evaluation of the stored rules with the declared field formats and units.

Formula basis:
Men: TBW = 2.447 - 0.09156 x Age + 0.1074 x Height(cm) + 0.3362 x Weight(kg)
Women: TBW = - 2.097 + 0.1069 x Height(cm) + 0.2466 x Weight(kg)
Body Water% = TBW / Weight x 100

Interpret the outputs in the order shown by the result fields. Optional inputs affect only the outputs that depend on those variables.

Formula & How It Works

The calculation applies the following relations exactly as recorded in the metadata:

Men: TBW = 2.447 - 0.09156 x Age + 0.1074 x Height(cm) + 0.3362 x Weight(kg)
Women: TBW = - 2.097 + 0.1069 x Height(cm) + 0.2466 x Weight(kg)
Body Water% = TBW / Weight x 100

Each output field is produced by substituting the supplied inputs into the relevant relation and then applying the declared rounding or text format.

Worked Examples

Example 1: Average Healthy Male, 35, 80 kg, 178 cm

Inputs

sex: male age: 35 weight_kg: 80 height_cm: 178
Total Body Water: 45.3 L. Body Water%: 56.6%. Hydration Status: Normal

With Sex = male, Age = 35, Weight = 80 and Height = 178 as the stated inputs, the result is Total Body Water = 45.3 L, Body Water% = 56.6% and Hydration Status = Normal. Each value corresponds to the declared output fields.

Example 2: Average Healthy Female, 30, 65 kg, 165 cm

Inputs

sex: female age: 30 weight_kg: 65 height_cm: 165
Total Body Water: 31.6 L. Body Water%: 48.6%. Hydration Status: Below Average

With Sex = female, Age = 30, Weight = 65 and Height = 165 as the stated inputs, the result is Total Body Water = 31.6 L, Body Water% = 48.6% and Hydration Status = Below Average. Each value corresponds to the declared output fields.

Example 3: Older Adult, 70yo Male, 85 kg, 172 cm

Inputs

sex: male age: 70 weight_kg: 85 height_cm: 172
Total Body Water: 43.1 L. Body Water%: 50.7%. Hydration Status: Below Average

With Sex = male, Age = 70, Weight = 85 and Height = 172 as the stated inputs, the result is Total Body Water = 43.1 L, Body Water% = 50.7% and Hydration Status = Below Average. Each value corresponds to the declared output fields.

Example 4: Athletic Female, 25, 60 kg, 168 cm

Inputs

sex: female age: 25 weight_kg: 60 height_cm: 168
Total Body Water: 30.7 L. Body Water%: 51.1%. Hydration Status: Normal

With Sex = female, Age = 25, Weight = 60 and Height = 168 as the stated inputs, the result is Total Body Water = 30.7 L, Body Water% = 51.1% and Hydration Status = Normal. Each value corresponds to the declared output fields.

Common Use Cases

  • Estimate hydration levels and total body water
  • Understand normal vs low body water ranges
  • Clinical estimation for fluid replacement in dehydration
  • Educational tool for anatomy and physiology