Calculate absolute pressure from gauge pressure and atmospheric pressure. This calculator also helps convert between absolute pressure, gauge pressure, and atmospheric pressure in PSI, kPa, bar, MPa, Pa, atm, mmHg, and inHg.
Absolute pressure:
Absolute pressure equals gauge pressure plus atmospheric pressure.
Gauge pressure:
Gauge pressure is what many tanks, tire gauges, compressors, and hydraulic gauges display.
Atmospheric pressure:
At sea level, standard atmospheric pressure is about 14.696 PSI, 101.325 kPa, or 1 atmosphere.
An absolute pressure calculator is useful for gas laws, air tanks, compressors, vacuum systems, pneumatic systems, hydraulic systems, weather pressure, and converting PSIG to PSIA.
Use absolute pressure when pressure must be measured from a true zero-pressure reference, such as a vacuum.
The basic absolute pressure formula is:
Absolute Pressure = Gauge Pressure + Atmospheric Pressure
Add gauge pressure and atmospheric pressure. Absolute pressure = gauge pressure + atmospheric pressure.
Absolute pressure is measured from a vacuum. Gauge pressure is measured relative to atmospheric pressure.
At standard sea-level atmosphere, 0 PSIG is about 14.696 PSIA.
No. Absolute pressure is measured from a perfect vacuum, so it cannot be less than zero.