Millibar to PSI
Convert millibar to psi instantly. 1 mbar = 0.0145037738 psi. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert millibar to psi
To convert millibar to psi, divide by 68.9475729317 (multiply by 0.0145037738). 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.
psi = mbar × 0.0145037738
Millibar to PSI conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| Millibar | PSI |
|---|---|
| 1 mbar | 0.014504 psi |
| 2 mbar | 0.029008 psi |
| 3 mbar | 0.043511 psi |
| 5 mbar | 0.072519 psi |
| 10 mbar | 0.145038 psi |
| 20 mbar | 0.290075 psi |
| 25 mbar | 0.362594 psi |
| 50 mbar | 0.725189 psi |
| 100 mbar | 1.450377 psi |
| 500 mbar | 7.251887 psi |
| 1,000 mbar | 14.503774 psi |
What is a millibar?
A thousandth of a bar, the meteorologist's unit for air pressure.
What is a psi?
Pounds per square inch, the US pressure unit for tyres and plumbing.
The formula
psi = mbar × 0.0145037738
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 Millibar to PSI
- Type the number of millibar you want to convert.
- Read the result in psi 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 psi to millibar page.
Millibar to PSI — frequently asked questions
How many psi are in a millibar?
One millibar equals 0.0145037738 psi. psi = mbar × 0.0145037738
What is the formula to convert millibar to psi?
The formula is psi = mbar × 0.0145037738. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert psi back to millibar?
Divide instead of multiplying: one psi is 68.9475729317 mbar. 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 millibar to psi 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
This page answers each of these searches. They are the exact phrases visitors use to find the millibar to psi.
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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