# MPa to PSIG Converter

URL: https://speedycalculator.com/calculators/conversion/mpa-to-psig-conversion/
Last updated: 2026-10-25

> The MPa to PSIG converter turns a MPa reading into gauge pressure in psi, whether your MPa value is a gauge reading or an absolute pressure.

## Inputs

- Pressure (MPa)
- The value is
- Atmospheric pressure (psi, kPa, bar)

## Results

- Gauge pressure
- Absolute pressure

## Formula

```
psig = MPa(gauge) × 145.03774
psig = (MPa(abs) − atmospheric) × 145.03774
```

## Explanation

Pressure gauges show gauge pressure (relative to the air around them). European and engineering specs often quote MPa, sometimes as absolute pressure (MPa(a)), so check which one you have before converting to psig.

### How to use the MPa to PSIG Converter

- **Pressure**
- **The value is**
- **Atmospheric pressure**
- Every result field is editable: type into **Gauge pressure** and **Pressure** plus every other field update to match.

Results update as you type, and every field accepts the units shown in its menu.

### How it works

A gauge reading is simply converted to psi. An absolute reading first has atmospheric pressure subtracted.

### Inputs explained

FieldWhat to enterPressureIn MPaThe value isChoose one: Gauge pressure (MPag), Absolute pressure (MPaa)Atmospheric pressureUnits: psi, kPa, bar

### Example values

How the main result changes when **Pressure** changes and everything else stays at the example values above:

Pressure (MPa)Gauge pressure (psig)0.572.5190.75108.7781145.0381.25181.2971.5217.5572290.075

## Worked example

Inputs — Pressure: 1 MPa; The value is: Gauge pressure (MPag); Atmospheric pressure: 14.6959 psi.

Results — **Gauge pressure = 145.038 psig**; Absolute pressure = 159.734 psia.

## FAQ

**How many psig is 1 MPa gauge?**
About 145 psig.

**How many psig is 1 MPa absolute?**
About 130.3 psig.

**What formula does the MPa to PSIG Converter use?**
psig = MPa(gauge) × 145.03774.


## Sources

- [NIST Special Publication 811 – Guide for the Use of the International System of Units](https://www.nist.gov/pml/special-publication-811)
- [NIST Handbook 44 Appendix C – General tables of units of measurement](https://www.nist.gov/pml/owm/nist-handbook-44-current-edition)