This online calculator converts pressure between megapascals (MPa) and pounds per square inch (psi, also written lbf/in²). Results follow SI definitions and U.S. customary unit factors from national metrology tables.

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

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

Megapascals (MPa)

Result in Pounds per Square Inch (psi)

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How to Use

  1. Type a value in the “Megapascals (MPa)” input.
  2. Click “Convert” to compute the equivalent in psi.
  3. Use “Decimal Places” (0–10) to set rounding shown in the result and in the calculation line.
  4. Click “Copy Result” to place the numeric result on your clipboard.
  5. “Clear All” resets inputs, result, and calculation notes.
  6. The “Swap” switch to psi → MPa converter.

Definitions and Unit Facts

Megapascal (MPa) — SI derived unit of pressure. 1 Pa = 1 N/m²; 1 MPa = 1,000,000 Pa. In U.S. customary terms, 1 MPa = 145.0377447 psi (per NIST tables). Abbreviation: MPa. System: SI.

Pound per square inch (psi, lbf/in²) — pressure from one pound-force distributed over one square inch. In SI, 1 psi = 6,894.757 Pa (per NIST tables). Abbreviations: psi or lbf/in². System: U.S. customary (also used with Imperial contexts).

Conversion Formula

psi = MPa × 145.0377447

MPa = psi × 0.006894757

Source: NIST Handbook

MPa to PSI Converter - Megapascals to Pounds per Square Inch

Conversion Table

MPapsi
0.011.450
0.057.252
0.1014.504
0.2029.008
0.5072.519
1145.038
2290.075
2.5362.594
3435.113
5725.189
7.51087.783
101450.377
152175.566
202900.755
253625.944
304351.132
507251.887
7510877.831
10014503.774
15021755.662

Real-World Examples

  • Standard atmosphere (101,325 Pa): 0.101325 MPa = 14.69595 psi
  • SCUBA cylinder service pressure (200 bar): 20 MPa = 2,900.755 psi
  • SCUBA cylinder service pressure (300 bar): 30 MPa = 4,351.132 psi
  • Firefighter SCBA cylinder rating: 2216 psi = 15.278781 MPa
  • Firefighter SCBA cylinder rating: 4500 psi = 31.026406 MPa
  • Compressed natural gas vehicle cylinder service pressure: 3600 psi = 24.821125 MPa
  • Household pressure cooker operating pressure: 15 psi = 0.103421 MPa
  • Hydraulic system nominal rating: 5000 psi = 34.473785 MPa
  • Industrial air compressor tank rating: 175 psi = 1.206582 MPa
  • Abrasive waterjet pump pressure: 60,000 psi = 413.685418 MPa

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