# Pressure Conversion Calculator

> Convert pressure between pascals, bar, atmospheres, psi, torr, and millimeters of mercury.

Page: https://askcalculators.com/calculator/pressure-conversion-calculator/
Definition: https://askcalculators.com/calculator/pressure-conversion-calculator/definition.json
JSON Schema: https://askcalculators.com/calculator/pressure-conversion-calculator/schema.json
Version: 1.0.0
Maintained by: AskCalculators (software project; not a credentialed reviewer)
Qualified review: pending. Automated checks do not establish professional approval.
Page status: Live
Review status: Pending

## Use
Open the calculator page and enter values. Query-string parameters can restore and bookmark a calculation.
Example: https://askcalculators.com/calculator/pressure-conversion-calculator/?value=1&fromUnit=atm&toUnit=psi

## Inputs
- value: Pressure; type=number; required; default=1
- fromUnit: From unit; type=select; required; default=atm; values=Pa|kPa|MPa|bar|atm|psi|torr|mmHg
- toUnit: To unit; type=select; required; default=psi; values=Pa|kPa|MPa|bar|atm|psi|torr|mmHg

## Outputs
- result: Converted pressure; format=number; primary
- pascals: Equivalent pascals; format=number

## Formula
pascals = value × pascals-per-source-unit; result = pascals ÷ pascals-per-target-unit

## Rules
- Empty optional inputs are undefined, not zero.
- Hidden conditional inputs are ignored.
- Do not invent missing required inputs.