Chemistry
Pie Chart of Elements in the Human Body
Last reviewed on 2026-05-22.
Chemistry — verifiable data, editable template
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The human body is composed primarily of just six elements, with oxygen alone accounting for about 65% of body mass — mostly because the body is largely water.
The data
- Oxygen — 65 %
- Carbon — 18.5 %
- Hydrogen — 9.5 %
- Nitrogen — 3.2 %
- Calcium — 1.5 %
- Phosphorus — 1.0 %
- Other — 1.3 %
Source
NIH / standard biology references.
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