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Bar to PSIG Converter

Convert pressures between bar and psig, with psi, kPa, and atm references.

Formula shown0 inputs definedUpdated Nov 2025By CalcuTotal TeamFree, no sign-up

Quick Summary

Use this when you need:

Translate compressor discharge gauges in psig into bar for European datasheets
Check whether a process transmitter is outputting psia or psig by comparing against bar/atm
Calibrate HVAC and refrigeration gauges that need the atmospheric offset spelled out

You’ll get:Pressure

How this is calculated

Formula:

P_abs = P_gauge + 1 atm

In plain language:

Gauge pressures omit atmospheric pressure; the converter adds 1 atm (14.6959 psi) before scaling between bar, psig, and other units using Pa as the base.

The formula is always visible so you can verify the math and explain your numbers to anyone who asks.

What these terms mean

Pressure

Pressure used in the calculation.

When to use this calculator

Translate compressor discharge gauges in psig into bar for European datasheets
Check whether a process transmitter is outputting psia or psig by comparing against bar/atm
Calibrate HVAC and refrigeration gauges that need the atmospheric offset spelled out

Last updated: November 21, 2025

Bar to psig converter explained

Process gauges often read psig (psi above atmosphere) while datasheets and simulations list bar absolute. This calculator bridges them, adding or removing the atmospheric offset automatically so you don’t double-count or forget ambient pressure.

How the conversion works

Atmospheric pressure at sea level is about $14.6959\,\text{psi} = 1.01325\,\text{bar}$ . Conversions:

P_{\text{psi,abs}} = P_{\text{bar,abs}} \times 14.5038

P_{\text{psig}} = P_{\text{psi,abs}} - 14.6959

P_{\text{bar,abs}} = \frac{P_{\text{psig}} + 14.6959}{14.5038}

The tool uses Pascals internally, applying the same offset for psig every time.

Units and conversions

Unit	Symbol	Relation
Bar (absolute)	bar	$1\,\text{bar} = 100{,}000\,\text{Pa}$
PSI absolute	psia	$1\,\text{psia} = 6{,}894.757\,\text{Pa}$
PSI gauge	psig	$P_{\text{psig}} = P_{\text{psia}} - 14.6959$
Atmosphere	atm	$1\,\text{atm} = 101{,}325\,\text{Pa}$
Kilopascal	kPa	$1\,\text{kPa} = 1{,}000\,\text{Pa}$

Worked examples

Bar absolute to psig
Given $5.0\,\text{bar (abs)}$ :
$P_{\text{psia}} = 5.0 \times 14.5038 \approx 72.52\,\text{psia}$ $P_{\text{psig}} = 72.52 - 14.6959 \approx 57.82\,\text{psig}$
Result: 57.8 psig.
Gauge reading to bar absolute
Given $60\,\text{psig}$ :
$P_{\text{psia}} = 60 + 14.6959 = 74.6959\,\text{psia}$ $P_{\text{bar,abs}} = \frac{74.6959}{14.5038} \approx 5.15\,\text{bar}$
Result: 5.15 bar (abs).

Tips and pitfalls

Check instrument labels: psig is gauge, psia is absolute. Mixing them is the usual cause of one-atmosphere mistakes.
At altitude, local atmospheric pressure changes; psig still references the local ambient. Add the measured ambient if you need absolute values.
When sizing relief valves, work in absolute units end-to-end, then report psig only for operators.

References and further reading

Frequently Asked Questions

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Calculator info

Version:: v1.0.0
Last reviewed:: Nov 21, 2025
Sensitivity:: low
References:: 3

Last updated: November 21, 2025

Bar to psig converter explained

How the conversion works

Atmospheric pressure at sea level is about $14.6959\,\text{psi} = 1.01325\,\text{bar}$ . Conversions:

P_{\text{psi,abs}} = P_{\text{bar,abs}} \times 14.5038

P_{\text{psig}} = P_{\text{psi,abs}} - 14.6959

P_{\text{bar,abs}} = \frac{P_{\text{psig}} + 14.6959}{14.5038}

The tool uses Pascals internally, applying the same offset for psig every time.

Units and conversions

Unit	Symbol	Relation
Bar (absolute)	bar	$1\,\text{bar} = 100{,}000\,\text{Pa}$
PSI absolute	psia	$1\,\text{psia} = 6{,}894.757\,\text{Pa}$
PSI gauge	psig	$P_{\text{psig}} = P_{\text{psia}} - 14.6959$
Atmosphere	atm	$1\,\text{atm} = 101{,}325\,\text{Pa}$
Kilopascal	kPa	$1\,\text{kPa} = 1{,}000\,\text{Pa}$

Worked examples

Bar absolute to psig
Given $5.0\,\text{bar (abs)}$ :
$P_{\text{psia}} = 5.0 \times 14.5038 \approx 72.52\,\text{psia}$ $P_{\text{psig}} = 72.52 - 14.6959 \approx 57.82\,\text{psig}$
Result: 57.8 psig.
Gauge reading to bar absolute
Given $60\,\text{psig}$ :
$P_{\text{psia}} = 60 + 14.6959 = 74.6959\,\text{psia}$ $P_{\text{bar,abs}} = \frac{74.6959}{14.5038} \approx 5.15\,\text{bar}$
Result: 5.15 bar (abs).

Tips and pitfalls

Check instrument labels: psig is gauge, psia is absolute. Mixing them is the usual cause of one-atmosphere mistakes.
At altitude, local atmospheric pressure changes; psig still references the local ambient. Add the measured ambient if you need absolute values.
When sizing relief valves, work in absolute units end-to-end, then report psig only for operators.

Quick Summary

Calculator Tool

How this is calculated

What these terms mean

Pressure

When to use this calculator

Bar to psig converter explained

How the conversion works

Units and conversions

Worked examples

Tips and pitfalls

References and further reading

Frequently Asked Questions

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Calculator info

Bar to psig converter explained

How the conversion works

Units and conversions

Worked examples

Tips and pitfalls

References and further reading

Frequently Asked Questions

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