Enter the atmospheric pressure and gauge press into the calculator to determine the absolute pressure.

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## Absolute Pressure Formula

The follow equation is used to calculate an absolute pressure.

Pa = Pg + Pat

- Where Pa is the absolute pressure
- Pg is the gauge pressure
- Pat is the atmospheric pressure

## Absolute Pressure Definition

Absolute pressure is defined as the sum of the atmospheric pressure and gauge pressure.

## Absolute Pressure Example

How to calculate absolute pressure?

**First, determine the gauge pressure.**Calculate the gauge pressure.

**Next, determine the atmospheric pressure.**Calculate the atmospheric pressure.

**Finally, calculate the absolute pressure.**Calculate the absolute pressure using the formula above.

## FAQ

**What is absolute pressure?**

An absolute pressure in simple terms is the sum of a gauge pressure plus the atmospheric pressure.

**Why is absolute pressure needed?**

Absolute pressure is needed to analyze the pressure differential between different environment. Gauges can only directly measure the “gague pressure” which is the pressure with respect to the atmosphere.

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