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
| Megapascals | Psi | Psi | Megapascals |
|---|---|---|---|
| 0.1 MPa | 14.503774 psi | 1 psi | 0.0068947573 MPa |
| 0.5 MPa | 72.518869 psi | 2 psi | 0.013789515 MPa |
| 1 MPa | 145.03774 psi | 5 psi | 0.034473786 MPa |
| 2 MPa | 290.07548 psi | 10 psi | 0.068947573 MPa |
| 5 MPa | 725.18869 psi | 20 psi | 0.13789515 MPa |
| 10 MPa | 1,450.3774 psi | 50 psi | 0.34473786 MPa |
| 25 MPa | 3,625.9434 psi | 100 psi | 0.68947573 MPa |
| 30 MPa | 4,351.1321 psi | 1,000 psi | 6.8947573 MPa |
| 35 MPa | 5,076.3208 psi | ||
| 40 MPa | 5,801.5095 psi | ||
| 50 MPa | 7,251.8869 psi | ||
| 100 MPa | 14,503.774 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.
Formula
1 MPa = 145.03774 psi1 psi = 0.0068947573 MPapsi = MPa × 145.03774Worked example
Inputs — Megapascals: 1 MPa.
Results — Psi = 145.03773773 psi.
Frequently asked questions
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.