Elemental Composition of the Human Body

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 average (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), I chose to use the density of each in the liquid state at the respective boiling point.

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

Raw data from which this table was made are from Emsley, John, The Elements, 3rd ed., Clarendon Press, Oxford, 1998. This is a great trove of information, which I highly recommend for anyone wishing to learn more about the elements.