Biology
Pie Chart of Water in the Human Body by Compartment
Last reviewed on 2026-05-22.
Biology — verifiable data, editable template
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The average adult is about 60% water by mass. That body water is split between intracellular fluid (inside cells) and extracellular fluid (blood plasma, interstitial fluid, lymph).
The data
- Intracellular fluid — 66.6 %
- Interstitial fluid — 20 %
- Plasma — 7.4 %
- Transcellular fluid — 6 %
Source
Standard physiology references.
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