Enter the rock mass (lbs) and the rock volume (ft^3) into the Rock Density Calculator. The calculator will evaluate and display the Rock Density.

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## Rock Density Formula

The following formula is used to calculate the Rock Density.

**RD = RM / RV**

- Where RD is the Rock Density (lbs/ft^3)
- RM is the rock mass (lbs)
- RV is the rock volume (ft^3)

## How to Calculate Rock Density?

The following example problems outline how to calculate Rock Density.

Example Problem #1:

- First, determine the rock mass (lbs).
- The rock mass (lbs) is given as: 90.

- Next, determine the rock volume (ft^3).
- The rock volume (ft^3) is provided as: 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/ft^3)

Example Problem #2:** **

For this problem, the variables needed are provided below:

rock mass (lbs) = 145

rock volume (ft^3) = 34

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

RD = RM / RV** = ?**