Convert Megapascal to Pound per Square Inch (MPa → psi)
The megapascal is the engineering high-pressure unit, used in hydraulics, materials testing, and construction.
Megapascal to Pound per Square Inch Conversion Table
10 common values| Megapascal | Pound per Square Inch |
|---|---|
| 1 MPa | 145.03774 psi |
| 5 MPa | 725.18869 psi |
| 10 MPa | 1,450.3774 psi |
| 25 MPa | 3,625.9434 psi |
| 50 MPa | 7,251.8869 psi |
| 100 MPa | 14,503.774 psi |
| 200 MPa | 29,007.548 psi |
| 500 MPa | 72,518.869 psi |
| 1,000 MPa | 145,037.74 psi |
| 5,000 MPa | 725,188.69 psi |
How to Convert Megapascal to Pound per Square Inch Manually
Step by StepConverting megapascals to psi is straightforward: multiply by the conversion factor. Follow these three steps to do it by hand or in your head.
- 1Take your value in megapascalsStart with the number of megapascals (MPa) you want to convert.
- 2Multiply by 145.03774The conversion factor from MPa to psi is 145.03774. Multiply your value by this number.
- 3Read the result in psiThe result is your value in psi (psi).
Formula
Multiply the value in megapascals by 145.03774. For the reverse direction, multiply by 0.006895.
psi = MPa × 145.03774MPa = psi × 0.006895Tips
Use these in everyday conversions- 1 MPa = 10 bar = 145 psi.
- N/mm² = MPa (same unit, different notation).
- Use MPa for material science; bar for fluid dynamics.
Common Mistakes
Avoid these- Confusing MPa with MW or MJ.
- Using 1 MPa = 100 bar — that's incorrect; it's 10 bar.
- Mixing MPa and kPa without conversion in mixed docs.
About Megapascal and Pound per Square Inch
What is the Megapascal?
The megapascal equals 1,000,000 pascals (or 10 bar) and is the engineering high-pressure unit used in hydraulics, materials testing, and construction. Concrete compressive strength is rated in MPa (typical residential concrete is 20–35 MPa, structural concrete 35–70 MPa, high-strength up to 140 MPa), and steel yield strengths are 250–700 MPa for structural grades. Hydraulic systems operate at 10–70 MPa, and high-pressure-water-jet cutting reaches 400 MPa. The megapascal is dimensionally identical to N/mm² (newtons per square millimeter), making it natural for engineering calculations involving small areas. Earth's mantle pressure reaches gigapascals (1 GPa = 1,000 MPa). The MPa relates to the pascal (10⁶ Pa = 1 MPa), the bar (10 bar = 1 MPa), the psi (1 MPa ≈ 145.04 psi), and the atmosphere (1 MPa ≈ 9.87 atm). It is the standard unit in modern engineering specifications worldwide.
- Hydraulic system pressures
- Concrete and steel strength specifications
- High-pressure industrial processes
Concrete compressive strength: 20–60 MPa. Hydraulic press: 30–70 MPa. Steel yield strength: 250+ MPa.
What is the Pound per Square Inch?
Pounds per square inch (psi) equals approximately 6,895 pascals and is the standard pressure unit in American tire pressures, hydraulics, and gas-cylinder specifications. American car tires are typically inflated to 30–35 psi, household water systems run at 40–60 psi, and scuba tanks are filled to 3,000 psi (about 200 bar). The psi is essential in American engineering for stress calculations, hydraulic systems, and pneumatic equipment. Two variants exist: 'psig' (gauge, measured above atmospheric) and 'psia' (absolute, including atmosphere) — gauge is the default unless specified. The psi relates to the pascal (1 psi ≈ 6,895 Pa), the kilopascal (1 psi ≈ 6.895 kPa), the bar (14.504 psi = 1 bar), the atmosphere (14.696 psi = 1 atm), and the inch of mercury (1 inHg ≈ 0.491 psi). Outside the US, kPa or bar dominate.
- US tyre pressures
- US plumbing and water system specs
- US compressed-air tool ratings
US tyre: 32–35 psi. Water supply: 40–60 psi. SCUBA tank: 3000 psi. Car AC system: 30–200 psi.