PSI to PSIA
Convert a gauge-style pressure input into PSIA by adding atmospheric pressure.
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PSI to PSIA Table (14.696 psi Atmosphere)
| Input Pressure | Atmospheric PSI | PSIA |
|---|---|---|
| 0 | 14.696 | 14.696 |
| 5 | 14.696 | 19.696 |
| 10 | 14.696 | 24.696 |
| 25 | 14.696 | 39.696 |
| 50 | 14.696 | 64.696 |
| 100 | 14.696 | 114.696 |
| 150 | 14.696 | 164.696 |
| 200 | 14.696 | 214.696 |
| 250 | 14.696 | 264.696 |
| 500 | 14.696 | 514.696 |
Popular Conversions
- 0 input pressure = 14.696 psia at 14.696 psi atmosphere
- 5 input pressure = 19.696 psia at 14.696 psi atmosphere
- 10 input pressure = 24.696 psia at 14.696 psi atmosphere
- 25 input pressure = 39.696 psia at 14.696 psi atmosphere
- 50 input pressure = 64.696 psia at 14.696 psi atmosphere
- 100 input pressure = 114.696 psia at 14.696 psi atmosphere
- 150 input pressure = 164.696 psia at 14.696 psi atmosphere
- 200 input pressure = 214.696 psia at 14.696 psi atmosphere
What is PSI and PSIA?
PSI
Definition: PSI means pounds per square inch and is a customary pressure unit.
History/origin: It became a standard engineering and industrial unit in US customary practice.
Current use: PSI is used in hydraulics, pneumatics, tires, compressors, and pressure gauges.
PSIA
Definition: PSIA means pounds per square inch absolute and includes atmospheric pressure in the reading.
History/origin: Absolute-pressure notation became important once engineers needed to distinguish total pressure from gauge-only readings.
Current use: PSIA is used in thermodynamics, compressor work, gas laws, and sealed-system analysis.
Related Hydraulic Conversions
Hydraulic and water-system work often mixes pressure, head, force, and flow estimates in the same check.
| Related Conversion | Factor or Rule | Formula |
|---|---|---|
| psi to feet of water | × 2.306658726 | ft H2O = psi × 2.306658726 |
| psi to inches of water | × 27.67990472 | in H2O = psi × 27.67990472 |
| psi to head | water assumption | head(ft) = psi × 2.306658726 |
| psi to gpm | needs Cv and SG | Q = Cv × sqrt(DeltaP / SG) |
| psi to lbs | needs area | lb = psi × area(in^2) |
| Pa to psi | × 0.000145037738 | psi = Pa × 0.000145037738 |
| psia to psig | minus atmosphere | psig = psia – atmospheric pressure |
| psig to psia | plus atmosphere | psia = psig + atmospheric pressure |
Typical Use Cases
Frequently Asked Questions
Q: Why is atmospheric pressure part of this conversion?
A: Absolute pressure includes atmosphere, so the local atmospheric reference must be added to the gauge-style value.
Q: What default atmosphere does the converter use?
A: The default is 14.696 psi, a common sea-level reference. You can change it if your project uses another value.
Q: What is the difference between gauge and absolute pressure?
A: Gauge pressure starts from local atmospheric pressure, while absolute pressure starts from a true zero-pressure reference.
Q: Can I enter zero?
A: Yes. Zero gauge pressure converts directly to the atmospheric reference value in PSIA.
Q: Why does the table use 14.696 psi?
A: A fixed sea-level-style reference makes the pattern easy to scan. The live field above lets you adjust it.
Q: When is this useful?
A: It is useful in tanks, gas-law problems, sealed systems, compressor work, and instrumentation where absolute pressure is required.