How many PSI is 1 atmosphere?

1 standard atmosphere (atm) equals approximately 14.6959 pounds per square inch (psi). This is defined by the International System of Units and corresponds to the average air pressure at sea level.

How do I convert atm to PSI manually?

Multiply the atmosphere value by 14.6959. For example, 2 atm × 14.6959 = 29.3919 psi. To convert PSI back to atm, divide by 14.6959.

What is the difference between atm and PSI?

Atmosphere (atm) is a non-SI pressure unit defined as average sea-level air pressure. PSI (pounds per square inch) is the customary unit used in the United States for tire pressure, hydraulics, and engineering specs. 1 atm = 14.6959 psi.

What is standard atmospheric pressure in PSI?

Standard atmospheric pressure is 14.6959 psi (often rounded to 14.7 psi). This is the baseline pressure at sea level and is used as a reference in many engineering and scientific contexts.

What is 2 atm in PSI?

2 atmospheres equals approximately 29.39 psi. This pressure is roughly what you experience at 10 meters underwater, and it is a common reference point in scuba diving equipment ratings.

When would I use atm versus PSI?

Atmospheres are common in chemistry, physics, and scientific contexts worldwide. PSI is the standard in the United States for everyday applications like tire pressure, compressed air tools, and HVAC systems. Use this converter whenever you encounter specs in one unit but need the other.

Atmospheres to PSI Converter

Name: Atmospheres to PSI Converter
Availability: InStock
Author: Nham Vu

Enter a pressure in atmospheres and get the PSI equivalent instantly, with reverse PSI-to-atm conversion included.

Converter

Pressure in atmospheres (atm)

Result in PSI

Reverse: PSI to atmospheres

Pressure in PSI

Result in atm

Reference Table

Atmospheres (atm) PSI

0.1 atm 1.4696

0.5 atm 7.3480

1 atm 14.696

1.5 atm 22.044

2 atm 29.392

3 atm 44.088

5 atm 73.480

10 atm 146.959

15 atm 220.439

20 atm 293.919

50 atm 734.797

100 atm 1,469.594

Summary

Enter a pressure in atmospheres and get the PSI equivalent instantly, with reverse PSI-to-atm conversion included.

How it works

Enter the pressure value in atmospheres (atm) in the top input field.
The PSI result appears instantly with no button press needed.
Use the reverse field to convert PSI back to atmospheres.
Click "Copy" next to any result to copy the value to your clipboard.
Check the reference table for common atm-to-psi values at a glance.

Use cases

Convert standard atmospheric pressure (1 atm) to PSI for US engineering specs.
Translate tire inflation pressure from atm to PSI for American vehicles.
Check scuba tank pressures when switching between atm and PSI gauges.
Convert industrial boiler pressure ratings from atm to PSI for US equipment.
Compare weather pressure data given in atm against PSI-based instruments.
Verify hydraulic system specs that mix atm and PSI pressure units.
Convert altitude pressure readings from atm to PSI in aerospace calculations.
Convert chemistry lab gas cylinder pressures from atm to PSI for US suppliers.

Frequently Asked Questions

Last updated: 2026-07-01 · Reviewed by Nham Vu