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atm to psi Converter

Convert atmospheres to pounds per square inch and back — the diving and science pressure unit, translated into the psi every American gauge reads.

Convert atm ⇄ psi

29.3918 psi
2 atm = 29.3918 psi

Formula: 2 atm (atm × 14.6959) = 29.3918 psi

How the atm to psi conversion works

One standard atmosphere is 14.6959 psi: psi = atm × 14.6959, and atm = psi ÷ 14.6959. An atmosphere is defined as 101,325 pascals exactly — the standard sea-level pressure — and 14.6959 is simply that figure divided by 6,894.76 pascals per psi.

Underwater, atmospheres stack up: this is where divers live in atm. At the surface you are at 1 atm; every 10 metres (about 33 feet) of seawater adds roughly another atmosphere. So at 20 metres a diver is at 3 atm absolute — and 3 × 14.6959 = 44.09 psi absolute. Dive tables and computer algorithms work in absolute pressure, which is why the atm framing is so natural underwater.

Absolute versus gauge — the trap: a scuba tank gauge reads gauge pressure (above atmosphere), while depth pressure in atm is absolute (including atmosphere). A tank showing 3,000 psi gauge holds about 3,014.7 psi absolute, or 205.1 atm. Never mix the two without adding or subtracting that one atmosphere — it is the single most common pressure-conversion mistake in diving and in lab work alike.

Handy benchmarks: 1 atm = 14.70 psi, 2 atm = 29.39 psi, 3 atm = 44.09 psi (about 20 m depth), 5 atm = 73.48 psi and 10 atm = 146.96 psi. For tyre and gauge pressures in psi alone, see our psi to kPa converter; for barometric readings, our inHg to hPa converter.

atm to psi converter questions

What is 1 atm in psi?
One standard atmosphere is 14.6959 psi — often rounded to 14.7 psi. That is the pressure of the air around you at sea level, and the baseline every gauge-pressure reading sits on top of.
How do I convert atm to psi?
Multiply atmospheres by 14.6959: psi = atm × 14.6959. For example, 3 atm × 14.6959 = 44.09 psi. Divide psi by 14.6959 to go back to atmospheres.
How many atm am I at 30 metres underwater?
About 4 atm absolute: 1 atm at the surface plus roughly 1 atm per 10 metres of seawater. At 30 m that is 4 × 14.6959 = 58.78 psi absolute, or about 44.09 psi gauge once you subtract the surface atmosphere.
Is atm the same as bar?
Very close but not identical: 1 atm = 1.01325 bar, because a bar is exactly 100,000 pascals while an atmosphere is 101,325 pascals. For rough work they are interchangeable; for precise work they differ by about 1.3%.
What does a scuba tank pressure mean in atm?
Tank gauges read gauge pressure, so add one atmosphere first: a 3,000 psi gauge reading is 3,014.7 psi absolute, which is 3,014.7 ÷ 14.6959 = 205.1 atm inside the tank.

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Sources & official guidance

Exact pressure conversion — 1 atm = 14.6959 psi (101,325 Pa). Dive pressures here are absolute unless stated; never dive on converter output alone — follow your training and dive computer. See our disclaimer.