CHEMICAL COMPOSITION OF
HUMAN BODY

The table below shows the approximate quantities of the chemical elements present in an average 70 kg man.

Element             Amount
/ kg 
  Amount
/ Mol.
Oxygen   43     2700  
Carbon 16     1300  
Hydrogen 7     7000  
Nitrogen 1 .8   130  
Calcium 1 .0   25  
Phosphorus 0 .78   25  
Sulphur 0 .14   4 .4
Potassium 0 .14   3 .6
Sodium 0 .10   4 .3
Chlorine 0 .095   2 .7
Magnesium 0 .019   0 .78
Silicon 0 .018   0 .64
Iron 0 .0042   0 .075
Fluorine 0 .0026   0 .14
Zinc 0 .0023   0 .035
Rubidium 0 .00032   0 .0037
Strontium 0 .00032   0 .0037
Bromine 0 .00020   0 .0025
Lead 0 .00012   0 .00058
Copper 0 .000072   0 .0011
Aluminium 0 .000061   0 .0023
Cadmium 0 .000050   0 .00044
Boron < 0 .000048   0 .0044
Barium 0 .000022   0 .00016
Tin < 0 .000017   0 .00014
Iodine 0 .000013   0 .00010
Manganese 0 .000012   0 .00022
Nickel 0 .000010   0 .00017
Gold < 0 .000010   0 .000051
Molybdenum < 0 .0000093   0 .000097
Chromium < 0 .0000018   0 .000035
Caesium 0 .0000015   0 .000011
Cobalt 0 .0000015   0 .000025
Uranium 0 .00000009   0 .00000038
Beryllium 0 .000000036   0 .0000040
Radium   3.1×10-14     1.4×10-13
Chemical composition of the human body by mass

Pie chart showing chemical composition of human body by mass


The table below gives the amount of each chemical element found in the human body, from most to least abundant. For each element, there is the amount in mass units in an averge (70-kilogram) person, the volume of the element, and the length of the side of a cube that would contain that amount of the pure element. Volumes of solid and liquid elements are based on density at or near room temperature (where available). For the gaseous elements (oxygen, hydrogen, nitrogen, chlorine, and fluorine).

Element
Mass of element
in a 70-kg person
Volume of
purified element
Element would comprise a cube this long on a side:
oxygen 43 kg 37 L 33.5 cm
carbon 16 kg 7.08 L 19.2 cm
hydrogen 7 kg 98.6 L 46.2 cm
nitrogen 1.8 kg 2.05 L 12.7 cm
calcium 1.0 kg 645 mL 8.64 cm
phosphorus 780 g 429 mL 7.54 cm
potassium 140 g 162 mL 5.46 cm
sulfur 140 g 67.6 mL 4.07 cm
sodium 100 g 103 mL 4.69 cm
chlorine 95 g 63 mL 3.98 cm
magnesium 19 g 10.9 mL 2.22 cm
iron 4.2 g 0.53 mL 8.1 mm
fluorine 2.6 g 1.72 mL 1.20 cm
zinc 2.3 g 0.32 mL 6.9 mm
silicon 1.0 g 0.43 mL 7.5 mm
rubidium 0.68 g 0.44 mL 7.6 mm
strontium 0.32 g 0.13 mL 5.0 mm
bromine 0.26 g 64.2 µL 4.0 mm
lead 0.12 g 10.6 µL 2.2 mm
copper 72 mg 8.04 µL 2.0 mm
aluminum 60 mg 22 µL 2.8 mm
cadmium 50 mg 5.78 µL 1.8 mm
cerium 40 mg 4.85 µL 1.7 mm
barium 22 mg 6.12 µL 1.8 mm
iodine 20 mg 4.06 µL 1.6 mm
tin 20 mg 3.48 µL 1.5 mm
titanium 20 mg 4.41 µL 1.6 mm
boron 18 mg 7.69 µL 2.0 mm
nickel 15 mg 1.69 µL 1.2 mm
selenium 15 mg 3.13 µL 1.5 mm
chromium 14 mg 1.95 µL 1.3 mm
manganese 12 mg 1.61 µL 1.2 mm
arsenic 7 mg 1.21 µL 1.1 mm
lithium 7 mg 13.1 µL 2.4 mm
cesium 6 mg 3.2 µL 1.5 mm
mercury 6 mg 0.44 µL 0.8 mm
germanium 5 mg 0.94 µL 1.0 mm
molybdenum 5 mg 0.49 µL 0.8 mm
cobalt 3 mg 0.34 µL 0.7 mm
antimony 2 mg 0.30 µL 0.7 mm
silver 2 mg 0.19 µL 0.6 mm
niobium 1.5 mg 0.18 µL 0.6 mm
zirconium 1 mg 0.15 µL 0.54 mm
lanthanium 0.8 mg 0.13 µL 0.51 mm
gallium 0.7 mg 0.12 µL 0.49 mm
tellurium 0.7 mg 0.11 µL 0.48 mm
yttrium 0.6 mg 0.13 µL 0.51 mm
bismuth 0.5 mg 51 nL 0.37 mm
thallium 0.5 mg 42 nL 0.35 mm
indium 0.4 mg 55 nL 0.38 mm
gold 0.2 mg 10 nL 0.22 mm
scandium 0.2 mg 67 nL 0.41 mm
tantalum 0.2 mg 12 nL 0.23 mm
vanadium 0.11 mg 18 nL 0.26 mm
thorium 0.1 mg 8.5 nL 0.20 mm
uranium 0.1 mg 5.3 nL 0.17 mm
samarium 50 µg 6.7 nL 0.19 mm
beryllium 36 µg 20 nL 0.27 mm
tungsten 20 µg 1.0 nL 0.10 mm