Pressure Converter

Pressure: convert between PSI, bar, and kilopascals using the exact NIST-defined pound-force and pascal relationships.

Works for any combination of the units above -- every value converts through the same verified base-unit math used on the individual pages.

How Pressure Units Relate

Pressure units all reduce to the pascal, the SI unit defined as one newton per square meter. PSI (pounds per square inch) traces back to the pound-force and the inch, two US customary definitions, while bar and kilopascal are metric multiples of the pascal, which is why bar and kPa convert to each other with a clean 1:100 ratio but PSI doesn't.

All Pressure Converters

Each of these has its own page with the exact formula, a reference table, and answers to common questions.

Bar to PSI Kilopascal to PSI PSI to Bar

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