Convert psi to atm
Convert psi to atm instantly. 1 psi = 0.068046 atm. Formula, worked examples and a quick reference table.
Last updated
One psi equals 0.068046 atmospheres. To convert any number of psi to atmospheres, multiply by 0.06804596.
The converter above works in both directions and updates as you type. Below you will find the formula, a worked example and a reference table of common values.
Pressure conversions are dominated by one everyday task: inflating a tyre. The United States and the United Kingdom quote psi, most of Europe uses bar, Canada and Australia use kilopascals, and the figure on the door jamb may not match the unit on the gauge. Beyond tyres, the same conversions serve weather reporting, diving, and any engineering work where a specification and an instrument were made in different markets.
psi to atm formula
To go the other way, use psi = atmosphere ÷ 0.06804596.
About these units
Pounds per square inch remains the standard for tyre pressure in the US and UK, while most of the world uses bar or kilopascals.
The standard atmosphere is defined as exactly 101,325 pascals, the average sea-level air pressure. It is a useful reference precisely because it is close to what a person experiences.
PSI is also written pounds per square inch and lb/in2. Atmosphere is also written atmospheres.
Sources
- National Bureau of Standards, "Refinement of Values for the Yard and the Pound", Federal Register, 1 July 1959 — the international yard as exactly 0.9144 m and the avoirdupois pound as exactly 0.45359237 kg.
- NIST Special Publication 811, Guide for the Use of the International System of Units (SI), 2008 edition — conversion factors for units outside the SI.
- 10th General Conference on Weights and Measures (1954), Resolution 4 — the standard atmosphere as exactly 101,325 pascals.
psi to atm conversion table
| PSI | Atmosphere |
|---|---|
| 1 psi | 0.06805 atm |
| 2 psi | 0.1361 atm |
| 3 psi | 0.2041 atm |
| 5 psi | 0.3402 atm |
| 10 psi | 0.6805 atm |
| 20 psi | 1.3609 atm |
| 25 psi | 1.7011 atm |
| 50 psi | 3.4023 atm |
| 100 psi | 6.8046 atm |
| 250 psi | 17.0115 atm |
| 500 psi | 34.023 atm |
| 1,000 psi | 68.046 atm |
Frequently asked questions
How many atmospheres are in a psi? +
There are 0.068046 atmospheres in one psi.
What is 10 psi in atm? +
10 psi equals 0.6805 atm. Multiply 10 by 0.06804596.
How do I convert atmosphere back to psi? +
Use psi = atmosphere ÷ 0.06804596. The converter above handles both directions, or see our dedicated atm to psi page.
How accurate is this psi to atmosphere conversion? +
The factor used is 0.0680459639, carried at full double precision. Where a unit has an exact legal definition the factor is exact rather than approximate. Rounding is applied only to the displayed result, so the answer is never a calculation done on an already-rounded number.
Is there a quick way to estimate psi to atm in my head? +
Divide by 14.7. That reproduces the exact factor of 0.068046 to the precision you could read off a result anyway.