Body Water Percentage Calculator

Work out body water percentage instantly with clear inputs, formula shown and shareable results.

About Body Water Percentage Calculator

Body water percentage is total body water divided by weight, typically 50-65% for men and 45-60% for women - the difference reflecting higher average body fat, since adipose tissue holds much less water than muscle. About 62% of body water sits inside cells and 38% outside, and that ratio is a marker of cellular health.

Formulas

Water percentage

percent = total body water / body weight x 100

Compartments

intracellular about 62%, extracellular about 38% of total

Worked example

With the default values below, Body Water Percentage Calculator returns Body Water Percentage of 60.00%. Change any input above and every figure here is recalculated in your browser.

Inputs used

Total body waterminimum 1 L: 45 L
Body weightminimum 0 kg: 75 kg
Sexone of Male, Female: Male

Results

Body Water Percentage: 60.00%
Intracellular Water: 27.90 L
Extracellular Water: 17.10 L
Assessment: Within the typical range

Step by step

1Values used
2Water percentage
3Compartments
4Body Water Percentage= 60.00
5Intracellular Water= 27.90 L
6Extracellular Water= 17.10 L
7Assessment= Within the typical range

Assumptions and limits

The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
These figures are population-average estimates, not a medical assessment or diagnosis. Body composition equations carry errors of several percentage points, and healthy ranges vary with age, ethnicity, muscularity and medical history. Discuss weight or body composition goals with a qualified clinician or dietitian.
This is an estimate for general information and not professional medical advice. See the full disclaimer for the limits that apply to this kind of calculator.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

These figures are population-average estimates, not a medical assessment or diagnosis. Body composition equations carry errors of several percentage points, and healthy ranges vary with age, ethnicity, muscularity and medical history. Discuss weight or body composition goals with a qualified clinician or dietitian.

Frequently Asked Questions

Why do leaner people have higher water percentage?

Because muscle is about 75% water while fat is only about 10%, so the same total water is a larger share of a leaner body.

Does drinking more water raise the percentage?

Only transiently. The kidneys restore balance within hours, so the percentage is set by body composition rather than intake.