What is the difference between MPa and PSIG?

MPa (megapascal) is a unit of absolute pressure, while PSIG (pounds per square inch gauge) measures pressure relative to atmospheric pressure. This converter accounts for that difference by subtracting atmospheric pressure (14.7 psi) from the absolute value.

How do I convert MPa to PSIG?

First, convert MPa to psi by multiplying by 145.038 (since 1 MPa = 145.038 psi). Then subtract atmospheric pressure (14.7 psi) to get gauge pressure. For example, 1 MPa = 145.038 psi - 14.7 = 130.338 PSIG.

Why is the conversion not just MPa to psi?

PSIG is gauge pressure, which excludes atmospheric pressure. Absolute pressure (psi absolute) includes it. This converter specifically converts absolute MPa to gauge PSIG, so it subtracts the standard atmospheric pressure of 14.7 psi.

Conversion

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Calculatrice: Mpa To Psig Conversion Converter.

Utilisez Calculatrice: Mpa To Psig Conversion Converter pour obtenir un résultat clair et pratique à partir de vos données.

Cette calculatrice n'est pas encore entièrement traduite ; une partie du texte s'affiche en anglais.

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02 / RÉPONSE

Absolute pressure

Atmospheric reference

PSIG

0,000048775513

The MPa input is treated as absolute pressure. Enter the atmospheric reference used for the gauge zero; standard atmosphere is only a starting example.

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Cite this calculator

Canonical URL: https://mathify.one/fr/conversion/mpa-to-psig-conversion

Cite as: Mathify. (n.d.). Calculatrice: Mpa To Psig Conversion Converter. https://mathify.one/fr/conversion/mpa-to-psig-conversion

Use Cases

Engineering and Design Calculations

Engineers working with international specs may receive pressure values in MPa but need to communicate in PSIG for US-based equipment or documentation.

Example: Converting 0.5 MPa to PSIG gives 72.519 - 14.7 = 57.819 PSIG.

Frequently Asked Questions

What is the difference between MPa and PSIG?: MPa (megapascal) is a unit of absolute pressure, while PSIG (pounds per square inch gauge) measures pressure relative to atmospheric pressure. This converter accounts for that difference by subtracting atmospheric pressure (14.7 psi) from the absolute value.
How do I convert MPa to PSIG?: First, convert MPa to psi by multiplying by 145.038 (since 1 MPa = 145.038 psi). Then subtract atmospheric pressure (14.7 psi) to get gauge pressure. For example, 1 MPa = 145.038 psi - 14.7 = 130.338 PSIG.
Why is the conversion not just MPa to psi?: PSIG is gauge pressure, which excludes atmospheric pressure. Absolute pressure (psi absolute) includes it. This converter specifically converts absolute MPa to gauge PSIG, so it subtracts the standard atmospheric pressure of 14.7 psi.

Tips & Common Mistakes

Tips

Remember that this converter expects absolute pressure in MPa. If your value is already gauge pressure, you don't need to subtract atmospheric pressure.
Double-check your input: a small error in MPa can lead to a significant difference in PSIG, especially at high pressures.
For quick mental estimates, remember 1 MPa is roughly 145 psi, so subtract about 15 psi for gauge pressure.
Use the standard atmospheric pressure of 14.7 psi unless you know the local barometric pressure is different.

Common Mistakes to Avoid

Forgetting to subtract atmospheric pressure: This converter outputs PSIG, so you must subtract 14.7 psi from the absolute psi value.
Using the wrong conversion factor: Ensure you use 145.038 psi per MPa, not 145 or 14.5.
Confusing PSIG with PSIA: PSIG is gauge pressure, PSIA is absolute. This converter gives PSIG, so do not add atmospheric pressure.

Last updated: August 13, 2026