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)


  • 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.

  1. First, determine the pore volume.
  2. Next, determine the change in volume. 
  3. Next, determine the change in pressure (psi). 
  4. Next, gather the formula from above = Cf = 1/Vp * (dV/dP).
  5. Finally, calculate the Rock Compressibility.
  6. 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) =  ?