Look up the typical density of rock types in kg/m³, g/cm³ or lb/ft³, or calculate rock density, mass or volume from your measurements, plus unit weight.

Optional settings

Rock Density Formula

The following formula is used to calculate the Rock Density. 

RD = RM / RV
  • Where RD is the Rock Density (lbs/ft3)
  • RM is the rock mass (lbs) 
  • RV is the rock volume (ft3) 

To calculate the rock density, divide the rock mass by the rock volume.

How to Calculate Rock Density?

The following example problems outline how to calculate Rock Density.

Example Problem #1:

  1. First, determine the rock mass (lbs).
    1. The rock mass (lbs) is given as 90.
  2. Next, determine the rock volume (ft3).
    1. The rock volume (ft3) is provided as 3.
  3. Finally, calculate the Rock Density using the equation above: 

RD = RM / RV

The values given above are inserted into the equation below:

RD = 90 / 3 = 30 (lbs/ft3)

Example Problem #2: 

For this problem, the variables needed are provided below:

rock mass (lbs) = 145

rock volume (ft3) = 34

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

RD = RM / RV = 145 / 34 ≈ 4.264706 lbs/ft³