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MPa to PSI Conversion Calculator — Megapascals to Pounds per Square Inch

Convert any pressure in megapascals (MPa) to psi (pounds per square inch) and other common pressure units. The exact factor is 1 MPa = 1,000,000 Pa ÷ 6,894.757 Pa/psi ≈ 145.0377 psi.

MPa

Enter the absolute pressure in megapascals (1 MPa = 1,000,000 Pa = 10 bar)
Pounds per square inch (psi)
145.0377psi

1 MPa = 145.0377 psi (absolute pressure measured from vacuum)

Bar
10 bar
Kilopascals (kPa)
1,000 kPa
Atmospheres (atm)
9.86923 atm
Pascals (Pa)
1,000,000 Pa
021.843.565.387108.8130.5152.317414.696 psi (1 atm)145.04 psiResult in psi — green mark = 1 standard atmosphere (14.696 psi)
Step by step
  1. 1

    psi per MPa factor

    1,000,000 ÷ 6,894.757 = 145.03774
    1 MPa = 1,000,000 Pa; 1 psi = 6,894.757 Pa
  2. 2

    Convert to psi

    1 × 145.03774 = 145.0377
Results are estimates for general information only and are not professional advice — always verify important results independently before relying on them. Read the full disclaimer.
Quick answer

How does this calculator work?

1 MPa = 145.0377 psi (absolute), because 1 MPa = 1,000,000 Pa and 1 psi = 6,894.757 Pa. Also: 1 MPa = 10 bar = 1,000 kPa ≈ 9.869 atm. All values are absolute pressure — for gauge psi (psig), subtract the atmospheric pressure (14.696 psia).

Formula
psi = MPa × (1,000,000 / 6,894.757) = MPa × 145.03773…
How this is calculated

The megapascal (MPa) is a metric pressure unit equal to exactly 1,000,000 pascals (Pa) or 10 bar. It is the standard unit in structural engineering (concrete and steel strength), hydraulic systems, materials testing, and high-pressure industrial processes.

The psi (pound-force per square inch) is defined through exact imperial constants: 1 lbf = 4.448222 N and 1 inch = 0.0254 m exactly, giving 1 psi = 4.448222 / (0.0254)² = 6,894.757 Pa. Dividing the MPa definition (1,000,000 Pa) by the psi factor (6,894.757 Pa) yields the exact conversion: 1 MPa = 145.03773772954 psi.

All values are absolute pressures — measured from a perfect vacuum. In hydraulic and industrial contexts pressures are often read as gauge (above atmospheric). One standard atmosphere ≈ 0.101325 MPa ≈ 14.696 psi; to convert gauge MPa to absolute before converting to psi, add 0.101325 MPa. For MPa-to-psig (gauge psi) directly, use the dedicated MPa to PSIG calculator.

Frequently asked questions

1 MPa = 145.0377 psi (absolute). More precisely: 1 MPa = 1,000,000 / 6,894.757293 = 145.03773772954 psi. For a quick mental estimate, multiply MPa by 145.

Yes — 1 MPa = 1 N/mm² exactly. This equivalence is used in structural and materials engineering: concrete compressive strength and steel tensile strength are often quoted interchangeably in MPa and N/mm².

This calculator produces absolute psi (psia), measured from a perfect vacuum. Gauge psi (psig) is the pressure above local atmospheric pressure (≈ 14.696 psia at sea level). To get psig: psig = psia − 14.696. A tyre inflated to 32 psig has an absolute pressure of about 46.7 psia ≈ 0.322 MPa.

Also known as

mpa to psi conversion
megapascals to pounds per square inch
1 mpa in psi
convert mpa to psi
mpa psi pressure converter
145 psi per mpa
mpa to psi formula
mpa psi calculator

APA

TG we-Calculate Editorial Team. (2026). MPa to PSI Conversion Calculator — Megapascals to Pounds per Square Inch [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/mpa-to-psi-conversion-calculator

Chicago

TG we-Calculate Editorial Team. "MPa to PSI Conversion Calculator — Megapascals to Pounds per Square Inch." TG we-Calculate. 2026. https://we-calculate.com/calculator/mpa-to-psi-conversion-calculator.

IEEE

TG we-Calculate Editorial Team, "MPa to PSI Conversion Calculator — Megapascals to Pounds per Square Inch," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/mpa-to-psi-conversion-calculator

BibTeX

@misc{wecalculate_mpa_to_psi_conversion_calculator, title = {MPa to PSI Conversion Calculator — Megapascals to Pounds per Square Inch}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/mpa-to-psi-conversion-calculator}}, year = {2026}, note = {TG we-Calculate} }

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