Enter the local atmospheric pressure (Pa) and the absolute pressure (Pa) into the calculator to determine the Vacuum Pressure.

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## Vacuum Pressure Formula

The following formula is used to calculate the Vacuum Pressure.

Pvac = PL - PA

- Where Pvac is the Vacuum Pressure (Pa)
- PL is the local atmospheric pressure (Pa)
- PA is the absolute pressure (Pa)

To calculate a vacuum pressure, simply subtract the absolute pressure from the local atmospheric pressure.

## How to Calculate Vacuum Pressure?

The following two example problems outline how to calculate the Vacuum Pressure.

**Example Problem #1:**

- First, determine the local atmospheric pressure (Pa). In this example, the local atmospheric pressure (Pa) is given as 500.
- Next, determine the absolute pressure (Pa). For this problem, the absolute pressure (Pa) is given as 400.
- Finally, calculate the Vacuum Pressure using the equation above:

Pvacuum = PL – PA

Inserting the values from above and solving the equation:

Pvacuum = 500 – 400 = 100 (Pa)

**Example Problem #2: **

Using the same process as above, first define the variables required by the formula. In this case, these values are:

local atmospheric pressure (Pa) = 234

absolute pressure (Pa) = 95

Entering these values yields:

Pvacuum = 234 – 95 = 139 (Pa)