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psi to atm Converter

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Convert pounds per square inch to atmospheres at the rate 1 atm = 14.696 psi, so 1 psi ≈ 0.06805 atm. Anchors: 14.7 psi ≈ 1 atm (sea-level standard), 30 psi ≈ 2.04 atm (typical car tire), 100 psi ≈ 6.80 atm. Useful when US-style pressures need to be expressed in chemistry-textbook atmospheres. Browser-local.

Decimal places:

From (Imperial, Pound per square inch)

Pound per square inch (psi)

To (Atmospheric, Atmosphere)

Atmosphere (atm)

Pound per square inch (psi) → Atmosphere (atm)

Quick reference table

Pound per square inch (psi)	Atmosphere (atm)
10 psi	0.6805 atm
14.7 psi	1.0003 atm
20 psi	1.3609 atm
30 psi	2.0414 atm
50 psi	3.4023 atm
100 psi	6.8046 atm
200 psi	13.6092 atm

Glossary

Pound per square inch (psi)

A pound-force per square inch equals 6,894.76 Pa. It is the dominant pressure unit in US automotive and engineering: tire pressure (32 psi = 2.21 bar), hydraulic systems (1,000–3,000 psi), bicycle tires (60–120 psi), municipal water (60 psi typical). Standard atmospheric pressure is 14.696 psi. The unit is sometimes split as psi-g (gauge, above atmospheric) and psi-a (absolute).

Atmosphere (atm)

A standard atmosphere is defined as exactly 101,325 Pa (= 1.01325 bar = 760 mmHg = 14.696 psi). It represents average atmospheric pressure at sea level under standard conditions. Used in chemistry (gas-law problems), high-altitude aviation references and pressure-vessel ratings. Not the same as the technical atmosphere (at, ≈ 98,066.5 Pa) — that is a separate, rarely used unit.

Metric / SI pressure

In the metric system, pressure is reported in pascals (SI base) or its multiples — kilopascal (kPa, 10³ Pa), megapascal (MPa, 10⁶ Pa) — and the related non-SI unit bar (10⁵ Pa). The millibar/hectopascal (mbar = hPa = 100 Pa) is used in meteorology. All metric units relate by exact powers of ten, so conversions between them are simple shifts of decimal point.

Imperial / US pressure

US engineering and automotive primarily report pressure in pounds per square inch (psi). 1 psi ≈ 6,894.76 Pa, defined as one pound-force per square inch. Standard atmospheric pressure is 14.696 psi. The closely related "psi-gauge" (psi-g) measures pressure above atmospheric, while "psi-absolute" (psi-a) measures total pressure including atmospheric.

Related tools

atm to psi

Convert atm to psi — 1 atm ≈ 14.696 psi

psi to Bar

Convert psi to bar — 1 psi ≈ 0.06895 bar

psi to kPa

Convert psi to kPa — 1 psi ≈ 6.895 kPa

Pressure Converter

Convert pressure — Pa, kPa, MPa, bar, mbar, atm, mmHg, psi