Enter the oil film parameter and the combined surface roughness into the Oil Film Thickness Calculator. The calculator will evaluate the Oil Film Thickness.

## Oil Film Thickness Formula

The following two example problems outline the steps and information needed to calculate the Oil Film Thickness.

**OFT = P * R**

Variables:

- OFT is the Oil Film Thickness (mm)
- P is the oil film parameter
- R is the combined surface roughness

## How to Calculate Oil Film Thickness?

The following steps outline how to calculate the Oil Film Thickness.

- First, determine the oil film parameter.
- Next, determine the combined surface roughness.
- Next, gather the formula from above = OFT = P * R.
- Finally, calculate the Oil Film Thickness.
- 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.

oil film parameter = 30

combined surface roughness = 20

OFT = P * R** **= ?