Pressure Converter

Pressure converter: psi, bar, atm, and pascals

A pressure converter switches between pascals, bar, atmospheres, psi, torr, and related units used in weather, HVAC, diving, and engineering. Enter a value in the unit you have and read the equivalent in the unit your gauge or datasheet expects.

Conversions are mathematical; sensor accuracy, temperature, and calibration still matter for safety-critical work.

How to use this converter

1. Choose the unit printed on your gauge or document.
2. Enter the numeric pressure.
3. Select the target unit (for example psi → kPa).
4. Copy the result into reports, homework, or configuration sheets.

Before and after examples

Common pressure equivalents.

Everyday and industrial units

Pascals (Pa) and kilopascals (kPa) are SI. Bar (~100 kPa) is common in Europe for tires and hydraulics. Atmospheres (atm) appear in chemistry and scuba tables. PSI (pounds per square inch) dominates US tire and compressor specs.

Inches or millimeters of mercury (inHg, mmHg/torr) show up in weather and medical blood-pressure contexts—confirm whether the reading is absolute or gauge pressure before comparing numbers.

Gauge vs absolute pressure

Gauge pressure is relative to ambient air; absolute includes atmospheric pressure. Tire stickers are almost always gauge. Vacuum pumps and some process specs use absolute. This converter scales magnitudes between units—it does not add or subtract 1 atm for you.

Force, area, and density

Pressure is force per area. When a problem gives force and area separately, convert those with the force and area tools, then derive pressure. Fluid column problems often need density and height—pair this page with the density converter for homework checks.

Frequently asked questions