Pressure Unit Converter

Input a pressure value in any field to translate between metric SI, imperial, manometric, meteorological, and vacuum measurement systems.

Metric & SI Units

International System of Units for scientific and industrial applications.

Pascals (Pa)

Kilopascals (kPa)

Megapascals (MPa)

Bar (bar)

Millibar (mbar)

Standard Atmospheres (atm)

Pressure units common in engineering, pneumatics, and HVAC systems.

Pounds per Square Inch (psi)

Pounds per Square Foot (psf)

Inches of Mercury (inHg)

Torr (Torr)

Units based on fluid column heights, often used in laboratory and HVAC gauges.

Millimeters of Mercury (mmHg)

Centimeters of Water (cmH₂O)

Inches of Water (inH₂O)

Units commonly used in weather reporting, aviation, and vacuum systems.

Millimeters of Water (mmH₂O)

Hectopascals (hPa)

Microns of Mercury (µm Hg)

Pressure conversion guidance

Atmospheric units (atm, bar, Torr) are based on standard sea-level pressure; slight discrepancies may exist in local weather reports.
Water column values assume pure water at 4°C; actual readings may vary with temperature and density.
All conversions use the Pascal as the base SI unit and are rounded to six decimal places when appropriate.