MPa to PSI Converter
Convert megapascals (MPa) to pounds per square inch (psi) instantly — exact and free.
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How to convert MPa to PSI
To convert megapascals to psi, multiply by 145.037738. This comes from the exact definition of the psi as 6,894.757293168 pascals — the inverse of the ksi-to-MPa factor used elsewhere on this site, since 1 MPa is simply 1,000,000 pascals.
Worked example: tyre and hydraulic pressure specs
Passenger car tyre pressures are commonly specified around 2.2–2.5 bar in Europe, or as kPa on the tyre sidewall (a typical sidewall max might read 300 kPa = 0.3 MPa). Converting 0.3 MPa gives 43.5 psi — in the right range for a sidewall maximum rating on a typical passenger tyre, illustrating how the same spec appears as three different numbers (bar, kPa, psi) depending on which country's gauge you're reading.
Common mistake: gauge pressure vs absolute pressure
Most pressure gauges (including tyre gauges and most hydraulic system readouts) measure gauge pressure — pressure above atmospheric — not absolute pressure. A straightforward unit conversion like the one above doesn't add or remove the ~14.7 psi (101.325 kPa) of atmospheric pressure; it just converts the number you already have between units. If a specification explicitly calls for "absolute" pressure (common in vacuum and some process engineering contexts), you need to add atmospheric pressure before or after converting, not as part of the unit conversion itself.
Quick reference
| MPa | PSI |
|---|---|
| 1 MPa | 145.04 psi |
| 0.1 MPa (≈ 1 atm) | 14.50 psi |
| 10 MPa | 1,450.4 psi |
| 200 MPa (typical steel yield) | 29,007.6 psi |
Working in bar, atm, ksi or kPa instead? All Pressure/Stress units are available in the same dropdown above.
How to use the converter
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Confirm the units
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Frequently asked questions
What is 1 MPa in psi?
1 MPa equals approximately 145.038 psi.
How does MPa relate to bar?
1 MPa = 10 bar exactly, since 1 bar is defined as 100,000 pascals.
Why do hydraulic systems quote both bar and psi?
Hydraulic equipment is sold globally; bar is the common SI-adjacent unit in Europe while psi remains standard in the US, so many spec sheets list both to avoid ambiguity for international buyers.
Is psi the same everywhere in the world?
The unit itself (pound-force per square inch) is standardized the same way globally, but which pressure unit a given country's industry defaults to varies — psi dominates in the US, bar and kPa dominate in most of Europe and Asia.
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