Calculate gauge pressure from absolute pressure and atmospheric pressure. This calculator helps convert between gauge pressure, absolute pressure, and vacuum pressure in PSI, kPa, bar, MPa, Pa, atm, mmHg, and inHg.
Gauge pressure:
Gauge pressure equals absolute pressure minus atmospheric pressure.
Absolute pressure:
Absolute pressure equals gauge pressure plus atmospheric pressure.
Atmospheric pressure:
Standard sea-level atmospheric pressure is about 14.696 PSI, 101.325 kPa, or 1 atmosphere.
A gauge pressure calculator is useful for air tanks, compressors, tires, hydraulic systems, pneumatic systems, vacuum systems, pressure gauges, gas pressure checks, and pressure conversions.
This calculator helps separate gauge pressure from absolute pressure so the correct pressure reference is used.
The basic gauge pressure formula is:
Gauge Pressure = Absolute Pressure - Atmospheric Pressure
Subtract atmospheric pressure from absolute pressure. Gauge pressure = absolute pressure - atmospheric pressure.
Gauge pressure is measured relative to atmospheric pressure. Absolute pressure is measured relative to a perfect vacuum.
Yes. Negative gauge pressure means the pressure is below local atmospheric pressure, which is often described as vacuum pressure.
Most common pressure gauges show gauge pressure, meaning they read zero when exposed to normal atmospheric pressure.