PSI to Atmospheres Converter
Unit ConversionConvert psi to standard atmospheres. 1 psi is about 0.068046 standard atmospheres, with a conversion table and the reverse conversion.
Atmospheres
Equivalent pressure in standard atmospheres
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SponsoredThis converter turns psi into standard atmospheres (psi to atm). Enter a value and the result updates as you type. 1 psi is about 0.068046 standard atmospheres.
The psi is defined from the avoirdupois pound, standard gravity and the inch, which works out to about 6,894.757 pascals. 1 standard atmosphere is exactly 101,325 pascals, a reference value close to average sea-level air pressure. So one atmosphere is about 14.6959 psi, usually rounded to 14.7.
The result shows 0 for a negative entry, because absolute pressure, counted from a perfect vacuum, cannot be negative. For a gauge reading, convert it to psia first with the PSIG to PSIA converter listed below. The result is rounded to 6 decimal places.
How to Convert PSI to Atmospheres
To convert psi to standard atmospheres, divide by about 14.6959. For example, 30 psi is about 2.041379 atm.
To go from standard atmospheres back to psi, multiply atmospheres by about 14.6959.
PSI to Atmospheres Conversion Table
Common psi values converted to standard atmospheres, rounded to 6 decimal places.
| PSI | Atmospheres |
|---|---|
| 1 psi | 0.068046 atm |
| 5 psi | 0.34023 atm |
| 10 psi | 0.68046 atm |
| 14.696 psi | 1.000003 atm |
| 15 psi | 1.020689 atm |
| 20 psi | 1.360919 atm |
| 30 psi | 2.041379 atm |
| 50 psi | 3.402298 atm |
| 100 psi | 6.804596 atm |
| 500 psi | 34.022982 atm |
| 1,000 psi | 68.045964 atm |
PSI and Atmospheres in Gas Calculations
Gas law calculations need absolute pressure. A gauge reading of 30 psig is about 2.0414 atm above the surrounding air; as an absolute pressure at standard sea-level conditions it is about 3.0414 atm. Using the gauge value directly is a common mistake. A quick check on any answer: the value in atmospheres is about 15 times smaller than the value in psi.
The Ideal Gas Law Calculator takes pressure in atmospheres, so convert absolute psi here first. Engine cranking pressure in psi, estimated by the Compression Ratio to PSI Calculator, can be read in atmospheres the same way.
Frequently Asked Questions
What is 35 psi in atm?
35 psi is about 2.381609 atm.
How many psi is 1 atm?
1 atm is about 14.6959 psi.
Is 14.7 psi exactly 1 atm?
No. 14.7 psi is about 1.000276 atm. One atmosphere is about 14.695949 psi, and 14.7 is that value rounded.
Is the PSI to Atmospheres factor exact?
The factor is fixed by definitions, so it never changes, but it has no finite decimal form. 1 psi is about 0.068046 standard atmospheres. The calculator uses the full value and rounds only the result it shows.
What happens if I enter a negative value?
It shows 0. Atmospheres are an absolute unit here. A gauge reading in psig should first be converted to psia, then to atmospheres.
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