Elemental Composition of the Human Body by Mass

Typical Elements in a Person

The most abundant element in the human body by mass is oxygen.
The most abundant element in the human body by mass is oxygen. MEHAU KULYK/SCIENCE PHOTO LIBRARY / Getty Images

This is a table of the elemental composition of the human body by mass for a 70 kg (154 lb) person. The values for any particular person may be different, especially for the trace elements. Also, the element composition does not scale linearly. For example, a person who is half the mass may not contain half the amount of a given element. The molar amount of the most abundant elements is given in the table.

You may also wish to view the element composition of the human body in terms of mass percent.

Reference: Emsley, John, The Elements, 3rd ed., Clarendon Press, Oxford, 1998

Table of Elements in the Human Body by Mass

oxygen43 kg (61%, 2700 mol)
carbon16 kg (23%, 1300 mol)
hydrogen7 kg (10%, 6900 mol)
nitrogen1.8 kg (2.5%, 129 mol)
calcium1.0 kg (1.4%, 25 mol)
phosphorus780 g (1.1%, 25 mol)
potassium140 g (0.20%, 3.6 mol)
sulfur140 g (0.20%, 4.4 mol)
sodium100 g (0.14%, 4.3 mol)
chlorine95 g (0.14%, 2.7 mol)
magnesium19 g (0.03%, 0.78 mol)
iron4.2 g
fluorine2.6 g
zinc2.3 g
silicon1.0 g
rubidium0.68 g
strontium0.32 g
bromine0.26 g
lead0.12 g
copper72 mg
aluminum60 mg
cadmium50 mg
cerium40 mg
barium22 mg
iodine20 mg
tin20 mg
titanium20 mg
boron18 mg
nickel15 mg
selenium15 mg
chromium14 mg
manganese12 mg
arsenic7 mg
lithium7 mg
cesium6 mg
mercury6 mg
germanium5 mg
molybdenum5 mg
cobalt3 mg
antimony2 mg
silver2 mg
niobium1.5 mg
zirconium1 mg
lanthanum0.8 mg
gallium0.7 mg
tellurium0.7 mg
yttrium0.6 mg
bismuth0.5 mg
thallium0.5 mg
indium0.4 mg
gold0.2 mg
scandium0.2 mg
tantalum0.2 mg
vanadium0.11 mg
thorium0.1 mg
uranium0.1 mg
samarium50 µg
beryllium36 µg
tungsten20 µg