This online calculator converts pressure from pounds per square inch (psi, lbf/in²) to megapascals (MPa). Factors follow SI definitions and U.S. customary conversion tables from the National Institute of Standards and Technology (NIST).

Pounds per Square Inch (psi) to Megapascals (MPa) Converter

Enter a pressure in psi and press the button to convert it to MPa.

Pounds per Square Inch (psi)

Result in Megapascals (MPa)

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Calculation process will appear here.
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How to Use

  1. Enter a number in the “Pounds per Square Inch (psi)” field.
  2. Set “Decimal Places” (0–10) for the rounding shown in the result and in the calculation line.
  3. Select “Convert” to compute the value in MPa.
  4. Use “Copy Result” to copy the numeric output to your clipboard.
  5. Choose “Clear All” to reset inputs, result, and calculation notes.
  6. The “Swap” button is to go to MPa to psi converter.

Definitions and Unit Facts

Pound per square inch (psi, lbf/in²) — U.S. customary pressure unit defined as one pound-force distributed over one square inch. Exact SI relation used by standards bodies: 1 psi = 6,894.757 Pa. System: U.S. customary (also used in Imperial contexts). Common in hydraulics, pneumatics, compressed-gas cylinders, and equipment ratings.

Megapascal (MPa) — SI derived pressure unit. 1 Pa = 1 N/m²; 1 MPa = 1,000,000 Pa. In U.S. customary terms, 1 MPa = 145.0377377 psi. System: SI. Frequent in engineering material properties, hydraulics, and high-pressure applications.

Conversion Formula

MPa = psi × 0.006894757

psi = MPa × 145.0377377

Source: NIST Special Publication 811: Guide for the Use of the International System of Units (SI), tables for non-SI units and factors (psi ↔ Pa)

Psi to MPa Converter - Pounds Per Square Inch to Megapascals

Conversion Table

psiMPa
0.50.003447
10.006895
20.013790
50.034474
100.068948
12.50.086185
150.103421
200.137895
250.172369
300.206843
500.344738
750.517107
1000.689476
1501.034214
2001.378951
3002.068427
5003.447379
7505.171068
10006.894757
1000068.947573

Real-World Examples

  • Pressure cooker operating pressure: 15 psi = 0.103421 MPa
  • Industrial air compressor tank rating: 175 psi = 1.206583 MPa
  • SCBA cylinder service pressure: 2,216 psi = 15.278782 MPa
  • SCUBA/paintball aluminum cylinder: 3,000 psi = 20.684272 MPa
  • SCUBA high-pressure steel cylinder: 3,442 psi = 23.731755 MPa
  • CNG vehicle cylinder service pressure: 3,600 psi = 24.821126 MPa
  • SCBA/paintball composite cylinder: 4,500 psi = 31.026408 MPa
  • Hydraulic system line rating: 5,000 psi = 34.473786 MPa
  • Abrasive waterjet pump: 60,000 psi = 413.685438 MPa
  • Shop air regulator upper setting: 300 psi = 2.068427 MPa

What applications are you using this tool for? If you would like additional pressure or engineering calculators, please tell us in the comments and we will prioritize them.

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