What this calculator does
Convert pressure between pascals, bar, atmospheres, psi, torr, and millimeters of mercury.
How it works
The calculator evaluates pascals = value × pascals-per-source-unit; result = pascals ÷ pascals-per-target-unit. Inputs are checked before calculation, and invalid values such as zero denominators or out-of-range selections produce a clear error instead of a misleading result.
Input query strings and outputs
Use an input name in this page’s URL as ?name=value, and join additional inputs with &. Portable shared links may instead use the compact ?ac= state parameter.
Input query strings
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?value=PressureNumber · Required · Default: 1
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?fromUnit=From unitChoice · Required · Default: atm · Accepted values: Pa, kPa, MPa, bar, atm, psi, torr, mmHg
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?toUnit=To unitChoice · Required · Default: psi · Accepted values: Pa, kPa, MPa, bar, atm, psi, torr, mmHg
Outputs
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resultConverted pressureNumber · Primary output
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pascalsEquivalent pascalsNumber
Inputs and results
The inputs are Pressure, From unit, To unit. Results include Converted pressure, Equivalent pascals.