Pound per square inch (psi)
PSI means pound-force per square inch and is common for tires, pumps, and hydraulics.
History: PSI developed from imperial force and area units and settled in machinery, tires, and hydraulics.
Quickly convert PSI to millibars without lookup tables or manual math.
This page is focused on converting PSI to millibars. Type a number into the first field and the result appears immediately in the second field.
Example: 1 psi = 68.9475729317 mbar. Conversion formula: result = value × 6894.757293168 / 100.
Use this converter for everyday calculations, study notes, engineering checks, and quick value verification without installing a separate app.
PSI means pound-force per square inch and is common for tires, pumps, and hydraulics.
History: PSI developed from imperial force and area units and settled in machinery, tires, and hydraulics.
The millibar is one thousandth of a bar and is often used in meteorology for atmospheric pressure.
History: the millibar became popular in meteorology because atmospheric pressure is conveniently near 1000 mbar.
Enter a value in the Pound per square inch field. The converter applies the formula "result = value × 6894.757293168 / 100" and immediately shows the result in millibars.
1 psi = 68.9475729317 mbar.
Yes. Use the swap button or choose the reverse pair from the full conversion list.