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Engineering Calculator · 114

Absolute & Gauge Pressure Converter

Convert gauge and absolute pressure using an explicit ambient pressure and consistent pascal-based units.

Pressure & environment
Start calculationReview the method

Live calculation

Enter the known values.

Units remain visible beside every field and result. Change any input to recalculate immediately in your browser.

01

Inputs

02

Results

Absolute pressure201.325kPa absolute
Gauge pressure100kPa gauge
Ambient reference101.325kPa absolute

Formula
pabs=pg+pambp_{\mathrm{abs}}=p_{\mathrm{g}}+p_{\mathrm{amb}}pg=pabs−pambp_{\mathrm{g}}=p_{\mathrm{abs}}-p_{\mathrm{amb}}

The calculation runs locally in this browser. Values are not submitted or stored by this tool.

Direct answer

What this result means

Absolute pressure equals gauge pressure plus the ambient pressure used as the gauge reference. At 101.325 kPa ambient pressure, 1 bar gauge is 201.325 kPa absolute. Enter the actual reference pressure when conditions differ; 101.325 kPa is a default, not a measurement of your location.

Absolute & Gauge Pressure Converter engineering relationship diagramAbsolute pressure is referenced to vacuum, while gauge pressure is referenced to the entered ambient pressure. The diagram places vacuum, ambient and a positive gauge increment on one reference axis. Negative gauge pressure is valid when the corresponding absolute pressure remains nonnegative. This dedicated schematic represents absolute gauge pressure reference axis and is not to scale.p_ambp_gp_absVacuumAmbientPRESSURE REFERENCE · TOOL 114Known pressure referenceAbsolute pressure
Calculator-specific engineering relationship diagram — schematic, not a product drawing, and not to scale.

Formula & theory

Make the assumptions visible.

Absolute pressure is referenced to vacuum, while gauge pressure is referenced to the entered ambient pressure. The diagram places vacuum, ambient and a positive gauge increment on one reference axis. Negative gauge pressure is valid when the corresponding absolute pressure remains nonnegative.

Calculation relationship
pabs=pg+pambp_{\mathrm{abs}}=p_{\mathrm{g}}+p_{\mathrm{amb}}pg=pabs−pambp_{\mathrm{g}}=p_{\mathrm{abs}}-p_{\mathrm{amb}}

Absolute pressure is referenced to vacuum, while gauge pressure is referenced to the entered ambient pressure. The diagram places vacuum, ambient and a positive gauge increment on one reference axis. Negative gauge pressure is valid when the corresponding absolute pressure remains nonnegative.

Variables

p_gPressure relative to the entered ambient referencekPa gauge
p_ambAbsolute ambient pressure at the gauge referencekPa absolute

Use sequence

From measurement to review

  1. Identify whether the reported pressure is gauge or absolute and select its unit.
  2. Enter the pressure and the absolute ambient reference used by the gauge.
  3. Keep the result’s pressure reference with its value when comparing test conditions or requesting product support.

Limits

What this calculation does not confirm

  • Ambient reference pressure is positive and editable; weather, altitude and a sealed reference can change the appropriate value.
  • This arithmetic assumes a common pressure location and reference. It does not compensate a remote, sealed-reference or differential-pressure instrument.
  • A pressure conversion does not establish immersion protection, pressure containment or the sealing capability of a cable gland.

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Calculator FAQ

Use the number without losing the engineering context.

These answers clarify what the tool calculates and where a product-specific review still begins.

01Calculator guidanceIs 1 bar gauge the same as 1 bar absolute?

No. At an ambient reference of 101.325 kPa, 1 bar gauge is 201.325 kPa absolute. A reading of 1 bar absolute is −1.325 kPa gauge under that same reference.

02Calculator guidanceWhy should I replace the default ambient pressure?

One standard atmosphere is 101.325 kPa, but local atmospheric pressure varies with altitude and weather. Use the reference pressure relevant to the actual measurement when that difference matters.

03Calculator guidanceHow does this converter handle a vacuum reading?

Negative gauge pressure is accepted down to zero absolute pressure. A combination that would produce negative absolute pressure is rejected; verify units, pressure reference and the entered ambient value.

Product selection support

Connect the calculation with cable-entry product options.

Bepto Cable Glands can help relate a preliminary result to the product family and current model information for your application. You can start with the details you have; a complete drawing package is not needed to ask a question.

Request product support