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psi to MPa Converter

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Convert pounds per square inch to megapascals at the rate 1 psi ≈ 6.895 × 10⁻³ MPa, so 1,000 psi ≈ 6.895 MPa. Industrial context: a 3,000-psi hydraulic line is 20.68 MPa; a 10,000-psi water-jet cutter operates at 68.95 MPa. Useful when US engineering specs need to feed into metric material-strength or pressure-vessel calculations. Browser-local.

Decimal places:

From (Imperial, Pound per square inch)

Pound per square inch (psi)

To (Metric, Megapascal)

Megapascal (MPa)

Pound per square inch (psi) → Megapascal (MPa)

Quick reference table

Pound per square inch (psi)	Megapascal (MPa)
100 psi	0.6895 MPa
500 psi	3.4474 MPa
1000 psi	6.8948 MPa
5000 psi	34.4738 MPa
10000 psi	68.9476 MPa
50000 psi	344.7379 MPa

Glossary

Pound per square inch (psi)

A pound-force per square inch equals 6,894.76 Pa. It is the dominant pressure unit in US automotive and engineering: tire pressure (32 psi = 2.21 bar), hydraulic systems (1,000–3,000 psi), bicycle tires (60–120 psi), municipal water (60 psi typical). Standard atmospheric pressure is 14.696 psi. The unit is sometimes split as psi-g (gauge, above atmospheric) and psi-a (absolute).

Megapascal (MPa)

A megapascal equals 1,000,000 pascals or 10 bar. It is the standard engineering unit for hydraulic systems, high-pressure gas, water-jet cutting, material yield strength and concrete compressive strength. Typical hydraulic systems run at 10–35 MPa; structural concrete reaches 20–80 MPa; high-pressure water jets exceed 400 MPa.

Metric / SI pressure

In the metric system, pressure is reported in pascals (SI base) or its multiples — kilopascal (kPa, 10³ Pa), megapascal (MPa, 10⁶ Pa) — and the related non-SI unit bar (10⁵ Pa). The millibar/hectopascal (mbar = hPa = 100 Pa) is used in meteorology. All metric units relate by exact powers of ten, so conversions between them are simple shifts of decimal point.

Imperial / US pressure

US engineering and automotive primarily report pressure in pounds per square inch (psi). 1 psi ≈ 6,894.76 Pa, defined as one pound-force per square inch. Standard atmospheric pressure is 14.696 psi. The closely related "psi-gauge" (psi-g) measures pressure above atmospheric, while "psi-absolute" (psi-a) measures total pressure including atmospheric.

Related tools

MPa to psi

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