Enter the density of the substance (kg/m^3) and the density of the reference (kg/m^3) into the Relative Density Calculator. The calculator will evaluate and display the Relative Density. 

Relative Density Formula

The following formula is used to calculate the Relative Density. 

RD = ds / dr
  • Where RD is the Relative Density
  • ds is the density of the substance (kg/m^3) 
  • dr is the density of the reference (kg/m^3) 

To calculate the relative density, divide the density of the substance by the density of the reference.

How to Calculate Relative Density?

The following example problems outline how to calculate Relative Density.

Example Problem #1:

  1. First, determine the density of the substance (kg/m^3).
    1. The density of the substance (kg/m^3) is given as: 80.
  2. Next, determine the density of the reference (kg/m^3).
    1. The density of the reference (kg/m^3) is provided as: 20.
  3. Finally, calculate the Relative Density using the equation above: 

RD = ds / dr

The values given above are inserted into the equation below:

RD = 80 / 20 = 4 ((none))

Example Problem #2: 

For this problem, the variables needed are provided below:

density of the substance (kg/m^3) = 30

density of the reference (kg/m^3) = 100

This example problem is a test of your knowledge on the subject. Use the calculator above to check your answer. 

RD = ds / dr = ?