How to Calculate Molecular Size

The size of a molecule is measured in three dimensions.
••• molecule image by Vladislav Gajic from

Molecular size is a measure of the area a molecule occupies in three-dimensional space. The amount of space any mass takes up in three-dimensional space is known specifically as its volume. Using algebra and the density formula discovered by Archimedes of Syracuse, one can determine the molecular size of a molecule for any given mass of molecular substance.

    Let density equal mass over volume. (p (Greek letter rho) = m / v)

    Plug in the molecular values for the density equation.

    Multiple both sides of the equation by v over 1. This removes the fraction and results in the equation v x p = m.

    Divide both sides by p (rho). (vp= m is equal to v = m / p). The resulting value for v is the volume or three-dimensional size of the molecule.

Related Articles

Extract Your Own DNA and More With These Awesome Science...
How to Calculate the Height of a Cone From the Volume
Density to Molarity Conversion
How to Calculate Concentration From Density
How to Calculate the Degree of Polymerization
Density Vs. Concentration
How to Calculate Particle Concentration
How to Convert From Moles Per Liter to Percentage
How to Convert Micromolar to PPM
How to Convert ATM Pressure to Celsius
How to Find the Percent of Concentration of Copper...
The Five-Step Process for Finding Density
How to Convert From Molarity to Molality
What Is the Chemical Formula for Zeolite?
Difference Between Density & Mass
How to Calculate the Mass of a Solid
How to Calculate Moles from Molecular Weight
How to Calculate Cube Weight
How to Find Mass From Density
How to Calculate Density From Viscosity
How to Convert ML to MG