Psi to Atmospheres
An instant psi-to-atmospheres converter, with the formula and a reference table below.
| Psi | Atmospheres |
|---|---|
| 1 psi | 0.068046 atm |
| 2 psi | 0.136092 atm |
| 3 psi | 0.204138 atm |
| 5 psi | 0.34023 atm |
| 10 psi | 0.68046 atm |
| 25 psi | 1.701149 atm |
| 50 psi | 3.402298 atm |
| 100 psi | 6.804596 atm |
How to use
- Enter a value in the Psi field.
- The Atmospheres figure appears immediately — no button to press.
- Typing in the Atmospheres field converts back to Psi the same way.
- Use the reference table for the values that come up most often.
Psi to Atmospheres formula
To convert psi to atmospheres, multiply by 0.0680459639.
atm = psi × 0.0680459639
Why this factor: the pound per square inch and the atmosphere are both defined against the pascal, so dividing one definition by the other gives 0.0680459639 directly. Both definitions are set out in full below.
To go the other way, divide by 0.0680459639 — or use the Atmospheres to Psi converter, which is the same calculation reversed.
Worked example
Given 760 psi, multiplying by 0.0680459639 yields 51.714933 atm.
760 psi × 0.0680459639 = 51.714933 atm
The converter above does this for any value you type, in either direction.
What is a pound per square inch?
Pounds per square inch is the standard pressure unit in the United States.
Definition: One pound-force per square inch, which is about 6,894.757 pascals.
Where it is used: US tire pressure, compressed air and hydraulic systems, and plumbing water pressure.
What is an atmosphere?
A standard atmosphere is a fixed reference pressure, originally average sea-level air pressure.
Definition: Defined as exactly 101,325 pascals — an exact convention, not a measurement.
Where it is used: Chemistry reference conditions, diving pressure, and high-pressure physics.
Psi vs Atmospheres
The pound per square inch is a US customary unit while the atmosphere is a specialized unit. That is why the factor between them is not a round number: the two systems were defined independently and only later tied together by exact agreement.
Frequently asked questions
How many atmospheres are in a pound per square inch?
One pound per square inch equals 0.0680459639 atmospheres.
What is the formula to convert psi to atmospheres?
Multiply the number of psi by 0.0680459639. To reverse it, divide by 0.0680459639 instead.
How do I convert atmospheres back to psi?
Divide by 0.0680459639, which is the same as multiplying by 14.6959488.
How many atmospheres are in 10 psi?
10 psi works out to 0.68046 atm.
How is the pound per square inch defined?
One pound-force per square inch, which is about 6,894.757 pascals.