Convert MPa to PSI Instantly
Use this MPa to PSI converter to change pressure or stress from megapascals (MPa) into pounds per square inch (psi). Enter any decimal MPa value for an instant result, reverse PSI to MPa, or compare the same pressure across kPa, bar, Pa and atmospheres.
Convert MPa to PSI, reverse PSI to MPa, convert other common pressure units to PSI, or compare one value across several pressure units.
Enter pressure or stress in megapascals to calculate the equivalent value in PSI and related units.
Decimals are supported, such as 0.5, 2.75 or 32.8 MPa.
Reverse the conversion from pounds per square inch to megapascals.
Convert kilopascals, bar or standard atmospheres directly to PSI.
Enter one pressure value and convert it into MPa, PSI, kPa, pascals, bar and standard atmospheres.
Megapascals and pounds per square inch are commonly used to express pressure and mechanical stress. MPa belongs to the SI system because it is based on the pascal. PSI is widely used in U.S. customary engineering, hydraulic, pneumatic, automotive and construction work. Converting MPa to PSI is especially useful when specifications, test results, material data sheets or equipment ratings use different unit systems.
To convert MPa to PSI, multiply the MPa value by approximately 145.0377377. This conversion changes only the unit used to describe the pressure or stress; it does not change the physical quantity.
Example: 25 MPa × 145.0377377 ≈ 3,625.9434 PSI.
Example: 3,000 PSI × 0.0068947573 ≈ 20.6843 MPa.
The pascal is the SI derived unit of pressure, and the prefix mega means one million. Therefore, 1 MPa equals 1,000,000 Pa and 1,000 kPa. NIST publishes conversion factors between pascals and PSI, which can be scaled directly to megapascals.
This MPa to PSI chart gives common values for quick reference. For values not listed, use the calculator above to preserve more decimal precision.
| MPa | PSI | Bar | kPa |
|---|---|---|---|
| 0.1 MPa | 14.5038 psi | 1.0000 bar | 100 kPa |
| 0.5 MPa | 72.5189 psi | 5.0000 bar | 500 kPa |
| 1 MPa | 145.0377 psi | 10.0000 bar | 1,000 kPa |
| 2 MPa | 290.0755 psi | 20.0000 bar | 2,000 kPa |
| 5 MPa | 725.1887 psi | 50.0000 bar | 5,000 kPa |
| 10 MPa | 1,450.3774 psi | 100.0000 bar | 10,000 kPa |
| 15 MPa | 2,175.5661 psi | 150.0000 bar | 15,000 kPa |
| 20 MPa | 2,900.7548 psi | 200.0000 bar | 20,000 kPa |
| 25 MPa | 3,625.9434 psi | 250.0000 bar | 25,000 kPa |
| 30 MPa | 4,351.1321 psi | 300.0000 bar | 30,000 kPa |
| 35 MPa | 5,076.3208 psi | 350.0000 bar | 35,000 kPa |
| 40 MPa | 5,801.5095 psi | 400.0000 bar | 40,000 kPa |
| 50 MPa | 7,251.8869 psi | 500.0000 bar | 50,000 kPa |
| 60 MPa | 8,702.2643 psi | 600.0000 bar | 60,000 kPa |
| 70 MPa | 10,152.6416 psi | 700.0000 bar | 70,000 kPa |
| 80 MPa | 11,603.0190 psi | 800.0000 bar | 80,000 kPa |
| 100 MPa | 14,503.7738 psi | 1,000.0000 bar | 100,000 kPa |
0.5 × 145.0377377 = 72.5189 PSI.
2 × 145.0377377 = 290.0755 PSI.
20 × 145.0377377 = 2,900.7548 PSI.
30 × 145.0377377 = 4,351.1321 PSI.
The same multiplication works for decimals and large values. For example, 32.8 MPa is approximately 4,757.2378 PSI. Keeping several digits during the calculation helps avoid unnecessary rounding error.
A megapascal is one million pascals. Because a pascal is one newton per square meter, MPa is convenient when the pressures or stresses involved are too large to express efficiently in pascals. Engineering drawings, structural calculations, hydraulic systems, material testing and concrete strength specifications frequently use MPa.
For example, a value written as 30 MPa is exactly 30,000 kPa and 300 bar. Using MPa keeps these large SI pressure values compact and readable.
PSI stands for pounds per square inch and is shorthand for pound-force per square inch. It describes force distributed over an area of one square inch. PSI is common in the United States for tire pressure, compressed air, hydraulic equipment, water systems and many engineering specifications.
Because one PSI is much smaller than one MPa, the numerical PSI value is much larger for the same pressure. That is why 1 MPa converts to about 145 PSI rather than a fraction of one PSI.
Concrete compressive strength is often reported in MPa in metric specifications and PSI in U.S. specifications. A concrete strength of 20 MPa is about 2,901 PSI, 25 MPa is about 3,626 PSI, 30 MPa is about 4,351 PSI and 40 MPa is about 5,802 PSI.
When comparing concrete mix designs, test cylinders, structural notes or international project documents, make sure the number refers to the same type and age of strength test before comparing values. Unit conversion can align MPa and PSI, but it cannot correct differences in test standards, specimen geometry or curing conditions.
Hydraulic pumps, cylinders, hoses, fittings and pressure vessels may be rated in MPa, bar or PSI depending on where the equipment is manufactured. A 10 MPa rating is roughly 1,450 PSI, while 20 MPa is about 2,901 PSI. Converting the published rating helps when checking gauges, replacement components or system limits.
These pressure units are related but have different scales. One MPa equals 1,000 kPa and 10 bar. The same pressure is approximately 145.0377 PSI. Because the scale difference is large, moving a decimal point without applying the correct factor can create a serious error.
| Unit | Equivalent to 1 MPa | Typical Use |
|---|---|---|
| MPa | 1 MPa | Engineering stress, high pressure, materials |
| kPa | 1,000 kPa | General pressure, HVAC, tires |
| bar | 10 bar | Industrial pressure, compressed air |
| PSI | ≈ 145.0377 PSI | U.S. customary pressure and stress |
| Pa | 1,000,000 Pa | SI base-derived pressure calculations |
1 kPa is about 0.145 PSI, but 1 MPa is about 145 PSI because 1 MPa equals 1,000 kPa.
For MPa → PSI, multiply by 145.0377377. For PSI → MPa, multiply by 0.0068947573.
Keep enough digits through the calculation, then round the final result to the precision needed.
Converting units does not automatically convert gauge pressure to absolute pressure or vice versa.
For more pressure conversions, use kPa to PSI, kPa to MPa, kPa to Bar, Bar to PSI and Bar to kPa. For authoritative unit relationships, see the NIST pressure conversion table and the BIPM SI measurement units.
The pressure is unchanged; only the measurement unit and numerical scale are different.
The conversion factor can be carried to many decimal places, but the meaningful precision of the final answer depends on the precision of the original measurement. If a specification states 25 MPa with two significant digits, reporting a PSI value with ten decimal places suggests more measurement accuracy than the source provides.
For quick engineering reference, one or two decimal places in PSI may be enough. For calculations that feed into other formulas, keep more digits internally and round only the final result.
MPa to PSI conversion is a unit conversion only. A gauge pressure remains gauge pressure after conversion, an absolute pressure remains absolute pressure, and a material stress value remains a stress value. Always keep the original context of the number with the converted result.
This is particularly important when reading pressure-vessel, hydraulic, structural or material specifications because similar-looking values can represent working pressure, test pressure, yield stress, compressive strength or another engineering quantity.
Quick answers about megapascals, PSI, pressure and stress conversion.