Pressure Converter - Pa bar psi atm and more

What Is Pressure Converter?

The Pressure Converter converts mechanical pressure between common engineering and scientific units: pascal, kilopascal, megapascal, bar, millibar, psi, standard atmosphere, torr, millimetre of mercury, inch of mercury, and kilogram-force per square centimetre. Values are derived from the SI pascal as the common base inside the tool.

Key relationships

One standard atmosphere is defined as exactly 101 325 Pa. Inch of mercury uses the conventional 3386.388640341 Pa per inch at 0 °C. Pound-force per square inch follows the definition \(1\,\mathrm{psi} = 6894.757293168361\,\mathrm{Pa}\).

\(p_{\mathrm{Pa}} = p_{\mathrm{psi}} \times 6894.757293168361\)

How to use

Enter a numeric Pressure value.
Choose From unit and To unit (use Swap if needed).
Read the converted value and the text summary block.

Frequently Asked Questions

Are torr and mmHg identical here?

They are treated with distinct constants in this tool: torr uses the atm/760 definition; mmHg uses 133.322387415 Pa per mmHg. For most practical conversions they are extremely close but not bitwise identical.

Which atmosphere definition is used?

Standard atmosphere to pascal uses the 101325 Pa definition (IUPAC “standard atmosphere”).

Do you send values to a server?

No. All arithmetic runs in the browser.

Why does my result show scientific notation sometimes?

Display uses JavaScript numeric formatting with limited precision (about 12 significant digits) to stay readable across very large or small pressures.