The Atmospheres to PSI Converter converts pressure between standard atmospheres (atm) and pounds per square inch (psi) in either direction. One standard atmosphere equals exactly 14.696 psi — the key conversion for scuba diving, pneumatics, tire pressure, and pressure engineering applications.
14.6959
psi
101,325
Pa
14.6959
psi
101,325
Pa
Atmospheric pressure — the weight of air above us — is the natural pressure reference, but different industries use different units to express it. Scuba divers talk in atmospheres, car mechanics use psi, hydraulic engineers use bar, and scientists use pascals. The calculator for atmospheres to psi converts instantly between these two most common pressure units in English-speaking countries, in either direction.
One standard atmosphere (atm) is defined as exactly 101,325 pascals. One psi (pound-force per square inch) equals exactly 6,894.757 Pa. The conversion:
1 atm = 101,325 / 6,894.757 = 14.696 psi (to 4 decimal places)
1 psi = 1/14.696 atm = 0.06805 atm
For practical purposes, 1 atm ≈ 14.7 psi is the commonly used approximation. Key reference values:
Use this online calculator for any pressure conversion. The pressure converter handles all pressure units including pascal, bar, mmHg, and kPa.
A critical distinction in pressure measurement:
Conversion: P_absolute = P_gauge + P_atmospheric = P_gauge + 14.696 psi. A tire at 32 psig has absolute pressure of 32 + 14.696 = 46.696 psia = 3.18 atm absolute. Confusing gauge and absolute pressure is a common and sometimes dangerous error in engineering calculations. The pascals to psi converter and pressure converters category provide all pressure unit conversion tools.
Pressure increases by approximately 1 atm (14.696 psi) for every 10 meters (33 feet) of water depth. A diver at 30 m depth experiences 4 atm absolute (1 atm atmospheric + 3 atm water pressure) = 58.8 psi absolute. This pressure causes nitrogen narcosis above ~30 m, compresses wetsuits reducing their insulation, and determines decompression requirements. Breathing gas cylinders are rated in bar (metric) or psi (imperial) — a full 12-liter scuba cylinder at 200 bar = 2,900 psi = 197 atm. Understanding these conversions is fundamental for dive planning and equipment selection.
Industrial compressed air systems operate at standard pressures well known in both atm and psi:
The formula: PSI = atmospheres × 14.6959. This derives from the definition: 1 atm = 101,325 Pa (exact), and 1 PSI ≈ 6,894.757 Pa. Therefore 1 atm = 101,325 / 6,894.757 ≈ 14.6959 PSI.
For Pascals: Pa = atm × 101,325 (exact by definition).
Key references: 1 atm = 14.696 PSI = 101,325 Pa = 1.01325 bar = 760 torr = 29.921 inHg. At 10 m underwater depth, pressure increases by about 1 atm. The deepest ocean point (Mariana Trench, ~11,000 m) is about 1,100 atm (≈ 16,160 PSI).
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Standard atmosphere at sea level
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4 atm at 30m depth (3 atm water + 1 atm surface)
1 standard atmosphere = 14.6959 PSI. This is the average atmospheric pressure at sea level.
A standard atmosphere (atm) is defined as exactly 101,325 Pascals. It approximates the mean sea-level atmospheric pressure on Earth.
Pressure increases by about 1 atm for every 10.06 meters (33 feet) of seawater depth. At 30 m, total pressure is about 4 atm (3 from water + 1 from air).
2 atm = 29.392 PSI. This is the pressure at about 10 meters underwater depth.
No, but they are close. 1 atm = 1.01325 bar. The atmosphere is about 1.3% higher than 1 bar.
STP (Standard Temperature and Pressure) is 0°C (273.15 K) and 1 atm (101,325 Pa). IUPAC revised STP in 1982 to use 1 bar instead, but many textbooks still use 1 atm.
Humans can survive pressures up to about 60 atm with proper gas mixtures (as in deep saturation diving). Normal atmospheric variation is about 0.95–1.05 atm.
About 0.33 atm (4.85 PSI). This is why climbers need supplemental oxygen — the air pressure is only a third of sea-level pressure.
Traditionally with mercury barometers (invented by Torricelli in 1643). Modern instruments use electronic pressure sensors (piezoelectric or capacitive).
atm is the standard atmosphere (101,325 Pa). 'at' is the technical atmosphere (1 kgf/cm² = 98,066.5 Pa). They differ by about 3.2%.
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