PSIG to PSIA Converter

Conversion

Convert PSIG (gauge pressure) to PSIA (absolute pressure). PSIA = PSIG + 14.696 (atmospheric pressure). Essential for engineering, HVAC, and pressure system calculations.

Formula

PSIA = PSIG + 14.696
  • PSIG: Gauge pressure (relative to atmospheric pressure)
  • PSIA: Absolute pressure (relative to perfect vacuum)
  • 14.696 PSI = 1 standard atmosphere at sea level
  • At higher altitudes: subtract the local atmospheric pressure instead of 14.696
  • Used in HVAC, pneumatics, hydraulics, and industrial pressure systems

Example

Inputs
  • Gauge Pressure (PSIG): 30

Gauge pressure 30 PSIG: Absolute pressure = 30 + 14.696 = 44.696 PSIA.

Frequently asked questions

What's the difference between PSIG and PSIA?
PSIG is gauge pressure (pressure above atmospheric), PSIA is absolute pressure (total pressure). PSIA = PSIG + 14.696.
When do I use each?
PSIG for practical measurements (tire pressure, tank gauges). PSIA for physics/engineering calculations (gas laws, system design).