PSI to Megapascals
Convert psi to megapascals instantly. 1 psi = 0.0068947573 MPa. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert psi to megapascals
To convert psi to megapascals, divide by 145.0377377302 (multiply by 0.0068947573). The relationship is fixed, so the same factor works for any quantity — there is nothing to look up and nothing that changes with temperature, location or context.
MPa = psi × 0.0068947573
PSI to Megapascals conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| PSI | Megapascals |
|---|---|
| 1 psi | 0.006895 MPa |
| 2 psi | 0.01379 MPa |
| 3 psi | 0.020684 MPa |
| 5 psi | 0.034474 MPa |
| 10 psi | 0.068948 MPa |
| 20 psi | 0.137895 MPa |
| 25 psi | 0.172369 MPa |
| 50 psi | 0.344738 MPa |
| 100 psi | 0.689476 MPa |
| 500 psi | 3.447379 MPa |
| 1,000 psi | 6.894757 MPa |
What is a psi?
Pounds per square inch, the US pressure unit for tyres and plumbing.
What is a megapascal?
A million pascals, used for material strength and hydraulics.
The formula
MPa = psi × 0.0068947573
Every result on this page comes from this formula. Nothing is rounded until the final display, so figures match a spreadsheet to the cent.
How to use the PSI to Megapascals
- Type the number of psi you want to convert.
- Read the result in megapascals straight away — there is no button to press.
- Check the table below for the values that come up most often, or reverse the conversion with the linked megapascals to psi page.
PSI to Megapascals — frequently asked questions
How many megapascals are in a psi?
One psi equals 0.0068947573 MPa. MPa = psi × 0.0068947573
What is the formula to convert psi to megapascals?
The formula is MPa = psi × 0.0068947573. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert megapascals back to psi?
Divide instead of multiplying: one megapascal is 145.0377377302 psi. The reverse converter is linked in the related tools list.
Is this conversion exact?
Yes. Both units are defined against the same base unit by international agreement, so the factor is exact — any rounding you see is only in the display, which you can widen by entering more decimal places.
Is this psi to megapascals free to use?
Yes. Every calculator on the site is free, needs no sign-up, and runs entirely in your browser, so your figures never leave your device.
What people search for
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About this calculator
Written and reviewed by The Samsung Calculator editorial team. Every calculator is written against a published formula, reviewed against at least one independent reference implementation, and dated when it changes.
Last reviewed August 19, 2026 · Calculation runs client-side · No data collected · Report an error