Convert between pounds per square inch (psi) and standard atmospheres (atm) in either direction.
How it works
The standard atmosphere is defined as exactly 101,325 pascals, which works out to 1 atm = 14.6959 psi. Enter a value in either field and the other updates instantly.
What this does not include
This uses the standard atmosphere, a fixed reference pressure — not a local, altitude-adjusted atmospheric pressure reading, which would require a separate barometric measurement.
How to use this calculator
- Enter a value in psi or atmospheres.
- The other field updates automatically.
Why is atmospheric pressure used as a pressure unit?
“1 atmosphere” gives an intuitive reference point — roughly the air pressure at sea level — which makes it a convenient unit for comparing pressures people can relate to everyday experience.
Is atmospheric pressure the same everywhere on Earth?
No — actual atmospheric pressure varies with altitude and weather; the standard atmosphere (101,325 Pa) used here is a fixed reference value, not a live measurement.
Where is psi-to-atm conversion commonly needed?
Scientific and engineering contexts that mix US customary pressure gauges (psi) with metric or scientific atmosphere-based references, like gas cylinder or scuba tank ratings.
