# MPa to PSI Converter

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

> Convert megapascals (MPa) to psi (psi): 1 megapascal = 145.03774 psi, so multiply by 145.03774 or divide by 0.0068947573. Both fields are editable, so you can also type in psi and get megapascals back.

## Inputs

- Megapascals (MPa)

## Results

- Psi

## Formula

```
1 MPa = 145.03774 psi
1 psi = 0.0068947573 MPa
psi = MPa × 145.03774
```

## Explanation

One megapascal is about 145.04 psi. Hydraulic pressures, concrete strengths and pipe ratings are often converted this way.

### How to use the MPa to PSI Converter

- Type the number of megapascals into the **Megapascals** field. Decimals such as 0.5 are fine.
- Read the answer in **Psi** – it updates as you type, with no button to press.
- To convert the other way, type into **Psi** and the megapascals are recalculated.
- Press **Copy results** to copy both values with the page title, or **Copy link** to share this exact conversion.

This page converts only MPa ⇄ psi. Need a different unit? Use the general pressure converter, where you can choose any “from” and “to” unit.

### How it works

Both units measure pressure, so they are always in the same ratio: one megapascal equals 145.03774 psi. The calculator multiplies the number of megapascals you type by 145.03774 to give psi, and when you type into the psi field it divides by the same factor to give megapascals. Because the ratio never changes, doubling the megapascals always doubles the psi. Results are calculated at full precision and rounded only for display (up to eight decimal places, with very large or small values shown in scientific notation).

### How to convert megapascals to psi

- Write down the value in megapascals, for example **1 MPa**.
- Multiply by the conversion factor 145.03774 (because 1 megapascal = 145.03774 psi).
- 1 × 145.03774 = **145.03774 psi**.
- To go back from psi to megapascals, divide by 145.03774 – or multiply by 0.0068947573.

### MPa to psi conversion table

MegapascalsPsiPsiMegapascals0.1 MPa14.503774 psi1 psi0.0068947573 MPa0.5 MPa72.518869 psi2 psi0.013789515 MPa1 MPa145.03774 psi5 psi0.034473786 MPa2 MPa290.07548 psi10 psi0.068947573 MPa5 MPa725.18869 psi20 psi0.13789515 MPa10 MPa1,450.3774 psi50 psi0.34473786 MPa25 MPa3,625.9434 psi100 psi0.68947573 MPa30 MPa4,351.1321 psi1,000 psi6.8947573 MPa35 MPa5,076.3208 psi40 MPa5,801.5095 psi50 MPa7,251.8869 psi100 MPa14,503.774 psi

### What is a megapascal?

A megapascal is one million pascals, the same as one newton per square millimetre. Material strengths and hydraulic pressures are given in MPa.

### What is a pound per square inch?

Pounds per square inch is the pressure of one pound-force on one square inch, about 6,895 Pa. U.S. tyre gauges, compressors and hydraulic equipment read psi.

### Quick mental conversion

For a fast estimate, multiply megapascals by about **150** to get psi; the error is about 3.4%. Use the calculator above when you need the exact figure.

### Common mistakes to avoid

Mixing gauge pressure (psig, barg) with absolute pressure (psia, bara), treating bar and atm as identical, and confusing kgf/cm² with bar.

## Worked example

Inputs — Megapascals: 1 MPa.

Results — **Psi = 145.03773773 psi**.

## FAQ

**How many psi is 1 MPa?**
About 145.038 psi.

**How many MPa is 3,000 psi?**
About 20.7 MPa.

**How do I convert megapascals to psi?**
Multiply the number of megapascals by 145.03774. For example, 1 MPa × 145.03774 = 145.03774 psi.

**How do I convert psi back to megapascals?**
Divide by 145.03774 (or multiply by 0.0068947573), or simply type the value into the psi field above.

**What is 10 MPa in psi?**
10 MPa = 1,450.3774 psi.

**What is 100 MPa in psi?**
100 MPa = 14,503.774 psi.

**Is this conversion exact?**
Yes. The factor comes from the official definitions of both units (NIST and the SI), so the only difference you may see is rounding in the last displayed digit.

**Can I convert to other units on this page?**
This page converts only between megapascals and psi. To pick any pressure unit, use the general pressure converter linked under Related calculators.

**What formula does the MPa to PSI Converter use?**
1 MPa = 145.03774 psi.


## 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)