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. The same amount is also shown in bar, kPa, ksi.
- To go from psi back to megapascals, type into the Psi field instead. Every field also has a unit menu with all 18 pressure units, for example Pa, kPa, GPa, hPa, bar, mbar, atm, ksi, psf, mmHg, Torr.
Results update as you type, and everything is calculated in your browser.
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, for example 2 MPa is 290.07548 psi.
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 |
Pressure units explained
- Megapascal (MPa)
- A megapascal is one million pascals, the same as one newton per square millimetre. Material strengths and hydraulic pressures are given in MPa.
- Pound per square inch (psi)
- 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.
Formula
1 MPa = 145.03774 psi
1 pound per square inch = 0.0068947573 MPa
psi = MPa × 145.03774
Worked example
Inputs: Megapascals: 1 MPa.
Results: Psi = 145.03773773 psi; Bar = 10 bar; Kilopascals = 1,000 kPa; Ksi = 0.14503774 ksi.
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 the megapascals to psi conversion exact?
Yes. Both units have exact official definitions (NIST and the SI), so the factor 145.03774 is exact to every digit shown, so the only difference you may see is rounding in the last displayed digit.