Convert Psi to MPa

1 psi equals 0.00689476 MPa.

Formula: MPa = psi × 0.00689476

Psi to MPa Converter

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How to Convert Psi to MPa

1 psi = 0.00689476 MPa

MPa = Psi × 0.00689476

Example: 1 psi × 0.00689476 = 0.00689476 MPa

Reverse Conversion

To convert MPa back to psi:

  • Remember, 1 MPa equals 145.038 psi.
  • To convert 0.00689476 MPa to psi, multiply 0.00689476 x 145.038, resulting in 1 psi.

Common Psi to MPa Conversions

Psi to MPa (Part 1)
Psi MPa Actions
10 psi 0.0689476 MPa
100 psi 0.689476 MPa
500 psi 3.44738 MPa
Psi to MPa (Part 2)
Psi MPa Actions
1000 psi 6.89476 MPa
5000 psi 34.4738 MPa

Psi to MPa Conversion Table

Reference table with common psi to mpa conversions. All values calculated with high precision.

Psi to MPa Table
0.1 to 500

Psi MPa Actions
0.1 psi 0.000689476 MPa
14 psi 0.00172369 MPa
12 psi 0.00344738 MPa
1 psi 0.00689476 MPa
2 12 psi 0.0172369 MPa
5 psi 0.0344738 MPa
10 psi 0.0689476 MPa
25 psi 0.172369 MPa
50 psi 0.344738 MPa
100 psi 0.689476 MPa
250 psi 1.72369 MPa
500 psi 3.44738 MPa

Psi to MPa Table
1000 to 1 × 108

Psi MPa Actions
1000 psi 6.89476 MPa
2500 psi 17.2369 MPa
5000 psi 34.4738 MPa
10000 psi 68.9476 MPa
25000 psi 172.369 MPa
50000 psi 344.738 MPa
100000 psi 689.476 MPa
250000 psi 1723.69 MPa
500000 psi 3447.38 MPa
1000000 psi 6894.76 MPa
2500000 psi 17236.9 MPa
5000000 psi 34473.8 MPa
10000000 psi 68947.6 MPa
2.5 × 107 psi 172369 MPa
5 × 107 psi 344738 MPa
1 × 108 psi 689476 MPa

MPa to Psi Table
0.0001 to 12

MPa Psi Actions
0.0001 MPa 0.0145038 psi
0.00025 MPa 0.0362594 psi
0.0005 MPa 0.0725189 psi
0.001 MPa 0.145038 psi
0.0025 MPa 0.362594 psi
0.005 MPa 0.725189 psi
0.01 MPa 1.45038 psi
0.025 MPa 3.62594 psi
0.05 MPa 7.25189 psi
0.1 MPa 14.5038 psi
14 MPa 36.2594 psi
12 MPa 72.5189 psi

MPa to Psi Table
1 to 100000

MPa Psi Actions
1 MPa 145.038 psi
2 12 MPa 362.594 psi
5 MPa 725.189 psi
10 MPa 1450.38 psi
25 MPa 3625.94 psi
50 MPa 7251.89 psi
100 MPa 14503.8 psi
250 MPa 36259.4 psi
500 MPa 72518.9 psi
1000 MPa 145038 psi
2500 MPa 362594 psi
5000 MPa 725189 psi
10000 MPa 1450380 psi
25000 MPa 3625940 psi
50000 MPa 7251890 psi
100000 MPa 1.45038 × 107 psi

Definition of Psi

PSI: Pound per Square Inch

PSI (pound-force per square inch or lbf/in²) is a unit of pressure commonly used in the United States and other countries that use imperial units. It measures the force in pounds applied to an area of one square inch. PSI is widely used for tire pressure, hydraulic systems, pneumatic tools, and various industrial applications.

Conversions to Other Units of Measurement:

  1. Bar: 1 psi equals approximately 0.0689476 bar. This conversion is essential for international equipment specifications. For example, 30 psi equals approximately 2.07 bar.
  2. Pascal (Pa): 1 psi equals approximately 6,894.76 pascals. This conversion connects imperial to SI units. For example, 14.7 psi (approximately 1 atm) equals about 101,325 Pa.
  3. Kilopascal (kPa): 1 psi equals approximately 6.89476 kPa. This is frequently used in automotive and engineering contexts. For example, a tire pressure of 32 psi equals approximately 220.6 kPa.
  4. Atmosphere (atm): 1 psi equals approximately 0.068046 atm. Standard atmospheric pressure (1 atm) equals approximately 14.696 psi.
  5. Kilogram-force per square centimeter (kgf/cm²): 1 psi equals approximately 0.070307 kgf/cm². This conversion is used in older metric equipment.

PSI remains the dominant pressure unit in North America for everyday applications like tire inflation, air compressors, and blood pressure (though medical uses mmHg).

Definition
Imperial/US customary pressure unit equal to one pound-force per square inch.
Exact factor
1 psi = 6,894.757293168... Pa
Common equivalents
  • 1 psi ≈ 0.0689476 bar
  • 1 psi ≈ 6.89476 kPa
  • 14.696 psi ≈ 1 atm
Sources

Definition of MPa

Megapascal: High-Pressure Applications

The megapascal (MPa) is an SI-derived unit of pressure equal to 1,000,000 pascals (1,000 kPa or 10 bar). It is commonly used in engineering and materials science for measuring high pressures, such as the tensile strength of materials, hydraulic system pressures, and geological pressures. The megapascal provides convenient numbers when dealing with pressures that would be unwieldy in pascals or kilopascals.

Conversions to Other Units of Measurement:

  1. Bar: 1 megapascal equals exactly 10 bar. This simple relationship makes MPa convenient for high-pressure industrial work. For example, 20 MPa equals 200 bar.
  2. PSI: 1 megapascal equals approximately 145.038 psi. This conversion is essential for engineering specifications. For example, a steel with 250 MPa yield strength equals approximately 36,260 psi.
  3. Kilopascal (kPa): 1 megapascal equals exactly 1,000 kPa. For example, 5 MPa equals 5,000 kPa.
  4. Pascal (Pa): 1 megapascal equals exactly 1,000,000 pascals. This is the fundamental SI relationship.
  5. Atmosphere (atm): 1 megapascal equals approximately 9.86923 atm. This shows that MPa represents significantly higher pressures than atmospheric.

The megapascal is essential in structural engineering, material science, and any application involving high pressures.

Definition
SI-derived pressure unit equal to 1,000,000 pascals (10⁶ Pa).
Exact factor
1 MPa = 1,000,000 Pa (exact);  1 MPa = 10 bar (exact)
Common equivalents
  • 1 MPa = 1,000 kPa (exact)
  • 1 MPa ≈ 145.038 psi
  • 1 MPa ≈ 9.86923 atm
Sources

About the Psi

Facts & Uses

  • Pounds per square inch — the dominant pressure unit in US and UK engineering. 1 psi = 6894.757 Pa (derived from 1 lbf and 1 in², not exact in SI).
  • Standard for US tire pressure (cars 30-35 psi, bicycles 60-100 psi), plumbing (40-80 psi household water), and compressed air tools.
  • Common in gauge measurements: psig (gauge, relative to atmospheric) vs psia (absolute, including atmospheric pressure of 14.7 psi).
  • Used in scuba diving in the US (3000 psi tanks), oil & gas industry, boiler ratings, and welding cylinders.

Curiosities

  • 1 atm = 14.696 psi exactly — the value taught in US chemistry classes as the standard reference for sea-level pressure.
  • The pressure inside a champagne bottle is 5-6 bar (75-90 psi) — about three times typical car tire pressure, which is why corks fly with such force.
  • The deepest point in the Mariana Trench exerts about 16,000 psi (110 MPa) — over 1000 atmospheres.
  • Approximate equivalents: 14.7 psi ≈ 1 atm ≈ 1.01 bar ≈ 101.3 kPa ≈ 760 mmHg.

Sources

About the MPa

Facts & Uses

  • 1 MPa = 1,000,000 Pa = 1 N/mm² exactly — the convenient unit for high pressures and material stresses.
  • Standard in materials science for tensile strength: structural steel ≈ 250 MPa yield, high-strength steel 400-700 MPa, carbon fiber 3500+ MPa.
  • Used in hydraulic systems (typical hydraulic pressures 10-35 MPa), injection molding, and industrial pressure vessels.
  • High-pressure applications: diamond anvil cells reach 100-300 GPa; deep ocean trenches around 100 MPa at the Mariana Trench.

Curiosities

  • Concrete compressive strength is typically expressed in MPa: 25 MPa for residential, 40+ MPa for high-rise buildings, 100+ MPa for ultra-high-performance concrete.
  • The Earth's pressure at the core-mantle boundary reaches about 136 GPa = 136,000 MPa — beyond what can be sustained at the surface in any container.
  • 1 MPa is approximately the pressure under a 1 cm column of mercury per square millimeter, or about 145 psi.
  • Approximate equivalents: 1 MPa = 145 psi = 9.87 atm = 10 bar.

Sources

Frequently Asked Questions

How many MPa are in one psi?

One psi equals 0.00689476 MPa. To convert, multiply the psi value by 0.00689476. For the reverse, divide the MPa value by 0.00689476 (or multiply by 145.038).

What is 1 psi in MPa?

1 psi = 0.0068948 MPa. This is one of the most commonly searched conversions for this pair.

How precise is the psi-to-MPa conversion?

The factor 0.00689476 is accurate to 6 significant figures, derived from international measurement standards. Our calculator uses full precision internally.

Looking for the reverse? Convert MPa to Psi

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Conversion factors verified against NIST, BIPM, ISO 80000-4 1 atm = 101 325 Pa by definition (BIPM). Last reviewed: March 2026
Adilson Fernandes By Adilson Fernandes
Tiago Fernandes Reviewed by Tiago Fernandes

All unit conversions on CoolConversion use conversion factors defined or documented by internationally recognised standards bodies (such as ISO and NIST), including both SI and non-SI units.

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