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How much iron is in the human body?

An adult human body contains about three to four grams of iron, most of it in hemoglobin. If that amount were hypothetically turned into solid metallic iron, it would occupy only about 0.38–0.51 cubic centimeters—roughly the volume of a tiny watch screw. This is only a visual comparison: in the body, iron is chemically bound in hemoglobin and other compounds, and its total amount varies from person to person.

960 × 637 Commons thumbnail of a 4 cm hematite “red ocher” hand specimen. Original file page: https://commons.wikimedia.org/wiki/File:Hematite_(GeoDIL_number_-_1305).jpg; original source: https://geodil.dperkins.org/h/1305.html. Photographer: Darla Sondrol; Geoscience Digital Image Library / University of North Dakota Mineralogy Collection. License: CC0 1.0 Public Domain Dedication, verified on the Commons file page. Attribution is not required; credit retained here. This is a mineral specimen used as an illustration, not iron from the human body.
conceptual still life with a tiny screw and iron-colored grains. Synthetic illustration, not a photograph, extracted iron, or evidence. Prompt summary: “Editorial science still life, tiny steel watch screw beside reddish iron mineral grains on a neutral pale background, museum-catalog lighting, no text.”

960 × 637 Commons thumbnail of a 4 cm hematite “red ocher” hand specimen. Original file page: https://commons.wikimedia.org/wiki/File:Hematite_(GeoDIL_number_-_1305).jpg; original source: https://geodil.dperkins.org/h/1305.html. Photographer: Darla Sondrol; Geoscience Digital Image Library / University of North Dakota Mineralogy Collection. License: CC0 1.0 Public Domain Dedication, verified on the Commons file page. Attribution is not required; credit retained here. This is a mineral specimen used as an illustration, not iron from the human body.