Convert Pounds per Square Inch to Megapascals
Use this PSI to MPa calculator to convert pounds per square inch into megapascals quickly and accurately. Enter any psi pressure to get the MPa result, reverse the conversion from MPa to PSI, or compare the same pressure across kPa, bar, pascals and standard atmospheres.
Convert PSI to MPa, reverse MPa to PSI, compare pressure units, or start from another common pressure unit.
Enter pressure in pounds per square inch. The calculator multiplies PSI by 0.006894757293168 and returns megapascals.
Example: 1,000 PSI
Choose display precision
Multiply PSI by the factor
Enter megapascals to reverse the conversion. One MPa is approximately 145.03773773 PSI.
Example: 10 MPa
Choose display precision
Multiply MPa by 145.03773773
See the same PSI pressure expressed in MPa, kPa, bar, pascals and standard atmospheres.
Example: 3,000 PSI
Start with PSI, MPa, kPa, bar, pascals or standard atmospheres and convert the value across the full pressure set.
Uses a high-precision pressure factor for engineering, hydraulic, pneumatic and technical conversions.
Switch from megapascals back to pounds per square inch without manually rearranging formulas.
Compare PSI with MPa, kPa, bar, pascals and standard atmosphere values in one result.
Responsive calculator cards, scrollable tables and compact figures work on phones and tablets.
To convert PSI to MPa, multiply the pressure in pounds per square inch by 0.006894757293168. PSI is a pressure unit built from pound-force and square inches, while MPa means megapascal, or one million pascals. Because both units describe pressure, the conversion is a direct scale change: the physical pressure stays the same while the numerical value changes to a different unit system.
For a quick reverse conversion: PSI = MPa × 145.03773773.
For example, 1,000 PSI multiplied by 0.006894757293168 gives approximately 6.894757293 MPa. A pressure of 3,000 PSI is approximately 20.68427188 MPa, and 5,000 PSI is approximately 34.47378647 MPa. These values are common enough in engineering contexts that a reliable PSI to MPa converter can save repeated manual calculations.
Start with the pressure number shown in pounds per square inch.
Note whether the source value is gauge, absolute or differential pressure.
Multiply PSI by 0.006894757293168.
Choose enough decimal places for your engineering or reporting need.
Write the converted number with MPa so the unit is unambiguous.
The following table provides common PSI values converted to megapascals. Use the calculator above when your value is not listed or when you need more decimal places.
| PSI | MPa | kPa | Bar |
|---|---|---|---|
| 1 PSI | 0.006895 MPa | 6.894757 kPa | 0.068948 bar |
| 10 PSI | 0.068948 MPa | 68.947573 kPa | 0.689476 bar |
| 50 PSI | 0.344738 MPa | 344.737865 kPa | 3.447379 bar |
| 100 PSI | 0.689476 MPa | 689.475729 kPa | 6.894757 bar |
| 150 PSI | 1.034214 MPa | 1,034.213594 kPa | 10.342136 bar |
| 300 PSI | 2.068427 MPa | 2,068.427188 kPa | 20.684272 bar |
| 500 PSI | 3.447379 MPa | 3,447.378647 kPa | 34.473786 bar |
| 1,000 PSI | 6.894757 MPa | 6,894.757293 kPa | 68.947573 bar |
| 2,000 PSI | 13.789515 MPa | 13,789.514586 kPa | 137.895146 bar |
| 3,000 PSI | 20.684272 MPa | 20,684.271880 kPa | 206.842719 bar |
| 5,000 PSI | 34.473786 MPa | 34,473.786466 kPa | 344.737865 bar |
| 10,000 PSI | 68.947573 MPa | 68,947.572932 kPa | 689.475729 bar |
PSI means pounds per square inch, more precisely pound-force per square inch. It is widely encountered on pressure gauges, compressors, hydraulic equipment, tires, pumps, pressure washers, gas systems and industrial machinery in the United States and in technical documentation influenced by U.S. customary units. PSI expresses force distributed over an area: a reading of 100 PSI means the pressure corresponds to 100 pounds-force acting per square inch of area.
MPa means megapascal. The pascal is the coherent SI unit of pressure, equal to one newton per square meter. Because one pascal is small for many engineering pressures, megapascals are convenient for structural materials, hydraulic systems, mechanical engineering and high-pressure equipment. One MPa equals 1,000 kPa and 1,000,000 Pa.
If you regularly work across both systems, related converters such as kPa to PSI, MPa to PSI, kPa to MPa and kPa to Bar can help keep specifications consistent. For the formal SI framework, see the BIPM SI Brochure. For U.S. guidance on SI use and conversion factors, see NIST Special Publication 811.
Multiply 100 by 0.006894757293168. The result is 0.6894757293 MPa. Rounded to four decimal places, 100 PSI is 0.6895 MPa.
1,000 × 0.006894757293168 = 6.894757293 MPa. This is often rounded to 6.895 MPa or 6.89 MPa depending on the precision of the source pressure.
3,000 × 0.006894757293168 = 20.68427188 MPa. A rounded engineering value may be reported as 20.68 MPa.
5,000 PSI converts to 34.47378647 MPa. When comparing specifications, retain enough precision to avoid introducing a significant rounding error.
10,000 PSI is approximately 68.94757293 MPa. At high pressures, small differences in the conversion factor can create visibly different rounded results, so a high-precision factor is useful.
For the reverse calculation, multiply megapascals by approximately 145.03773773. This is useful when an engineering drawing, material data sheet or hydraulic specification is given in MPa but the gauge or equipment documentation uses PSI.
Example: 20 MPa × 145.03773773 ≈ 2,900.7548 PSI.
| MPa | PSI | kPa | Bar |
|---|---|---|---|
| 0.1 MPa | 14.5038 PSI | 100 kPa | 1 bar |
| 0.5 MPa | 72.5189 PSI | 500 kPa | 5 bar |
| 1 MPa | 145.0377 PSI | 1,000 kPa | 10 bar |
| 5 MPa | 725.1887 PSI | 5,000 kPa | 50 bar |
| 10 MPa | 1,450.3774 PSI | 10,000 kPa | 100 bar |
| 20 MPa | 2,900.7548 PSI | 20,000 kPa | 200 bar |
| 30 MPa | 4,351.1321 PSI | 30,000 kPa | 300 bar |
| 50 MPa | 7,251.8869 PSI | 50,000 kPa | 500 bar |
| 100 MPa | 14,503.7738 PSI | 100,000 kPa | 1,000 bar |
A PSI to MPa conversion is useful whenever equipment, materials or drawings cross between U.S. customary and SI pressure units. Common situations include hydraulic machinery, pneumatic systems, pressure vessels, pumps, industrial hoses, manufacturing equipment, test rigs and technical specifications.
Hydraulic pumps, cylinders, fittings and hoses may be labeled in PSI in one market and MPa or bar in another. Converting the rating allows you to compare pressure specifications without changing the underlying operating limit.
MPa is also common for stress and strength values because stress has the same dimensions as pressure. When converting a pressure or stress number, confirm that the source truly uses PSI and not ksi, because 1 ksi equals 1,000 PSI.
Compressed-air systems often use PSI, bar or kPa, while higher-pressure systems may use MPa. A multi-unit pressure converter is useful when a specification sheet, regulator and gauge use different labels.
Tire pressure is more commonly expressed in PSI, kPa or bar than MPa because MPa values are relatively small at normal tire pressures. The mathematical conversion still works, but always use the manufacturer-specified inflation pressure rather than choosing a pressure based on unit conversion alone.
Global projects frequently combine drawings, datasheets and instruments from different regions. Converting PSI to MPa creates a consistent pressure unit for calculations, reports and design reviews. Keep the original value and the converted value together when traceability matters.
Understanding the surrounding units can make PSI to MPa conversion easier to verify. The converter above uses pascals as the common base for multi-unit calculations.
The calculator can display several decimal places, but the precision of your final answer should reflect the precision of the original measurement. A pressure gauge that reads only to the nearest 5 PSI does not become more accurate merely because the converted MPa value is shown to eight decimals.
For general comparisons, three or four significant figures are often enough. For engineering documentation, calibration work or calculations that feed into another formula, retain additional digits during intermediate calculations and round only the final reported value. The converter keeps a high-precision factor internally so that repeated unit changes do not introduce unnecessary rounding error.
PSIG and PSIA are not different-sized pressure units; they use different reference points. PSIG is referenced to local or nominal atmospheric pressure, while PSIA is referenced to a vacuum. Similarly, MPa may be reported as gauge or absolute. A pure PSI to MPa conversion should preserve that basis: PSIG converts to MPa gauge, and PSIA converts to MPa absolute.
Engineering material strength may be reported in ksi, meaning kips per square inch. One ksi equals 1,000 PSI. If a steel strength is listed as 50 ksi, converting it as 50 PSI would be wrong by a factor of one thousand. Confirm the prefix before using any converter.
A visual reference showing how representative PSI values increase across the MPa scale.
For more pressure conversions, see MPa to PSI, kPa to PSI, PSI to kPa, MPa to kPa and kPa to Bar.
Common questions about converting pounds per square inch and megapascals.