Enter the pore volume, the change in volume, and the change in pressure (psi) into the Rock Compressibility Calculator. The calculator will evaluate the Rock Compressibility.

## Rock Compressibility Formula

The following formula is used to calculate the Rock Compressibility.

**Cf = 1/Vp * (dV/dP)**

Variables:

- Cf is the Rock Compressibility (1/psi)
- Vp is the pore volume
- dV is the change in volume
- dP is the change in pressure (psi)

## How to Calculate Rock Compressibility?

The following steps outline how to calculate the Rock Compressibility.

- First, determine the pore volume.
- Next, determine the change in volume.
- Next, determine the change in pressure (psi).
- Next, gather the formula from above = Cf = 1/Vp * (dV/dP).
- Finally, calculate the Rock Compressibility.
- After inserting the variables and calculating the result, check your answer with the calculator above.

**Example Problem:**

Use the following variables as an example problem to test your knowledge.

pore volume = 3

change in volume = 2

change in pressure (psi) = 5

Cf = 1/Vp * (dV/dP) =** ** ?