ATM to PSI Converter
Type atmospheres to get psi. One standard atmosphere, the average air pressure at sea level, is 14.696 psi.
1 atm =
14.6959psi
1 standard atmosphere is 14.6959 pounds per square inch.
- 1 atm
- 14.6959 psi
- 1 psi
- 0.06805 atm
How this works: Method, 3 sources,
How this works
Method
Multiply the number of atmospheres by 14.6959. A standard atmosphere is fixed at exactly 101,325 pascals, the average air pressure at sea level, and that divided by 6,894.757 pascals per psi is 14.6959488, rounded here to 14.6959. Full method
Sources
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Changes
- Ask understands “5 ft 9 in to cm” and “2 cups of flour in grams” and answers at once, and a decimal comma (“2,5”) reads as 2.5.
- First published: 89 everyday units across ten quantities, with 58 pages for common pairs such as cm to inches and Celsius to Fahrenheit.
How to convert atm to psi
Multiply the number of atmospheres by 14.6959. A standard atmosphere is fixed at exactly 101,325 pascals, the average air pressure at sea level, and that divided by 6,894.757 pascals per psi is 14.6959488, rounded here to 14.6959.
At 3 atm, a common figure in gas-law homework: 3 × 14.6959 = 44.09 psi absolute. Atmospheres are almost always absolute pressures, so the psi result is too (psia).
Watch for the older technical atmosphere (at), defined as one kilogram-force per square centimeter. It is 98,066.5 Pa, or 14.2233 psi, about 3% less than the standard atmosphere, and still turns up in older engineering tables.
pounds per square inch = standard atmospheres × 14.6959 (rounded)
- The standard atmosphere is defined as exactly 101,325 Pa, which is 1.01325 bar or 14.695 95 psi. Source: NIST SP 811, Appendix B.8: conversion factors by unit.
How to estimate atm to psi in your head
Call one atmosphere 14.7 psi, or 15 for a rough figure. Divers use a neat rule: every 10 meters (33 feet) of seawater adds about one atmosphere, so at 20 m you breathe air at about 3 atm absolute, roughly 44 psi.
Atmospheres to psi table
Half an atmosphere up to a hundred, in pounds per square inch absolute.
| Standard atmospheres (atm) | Pounds per square inch (psi) | Example |
|---|---|---|
| 0.5 | 7.348 | air pressure near 5,500 m altitude |
| 1 | 14.6959 | sea level |
| 1.5 | 22.0439 | |
| 2 | 29.3919 | about 10 m under the sea |
| 2.5 | 36.7399 | |
| 3 | 44.0878 | |
| 4 | 58.7838 | about 30 m under the sea |
| 5 | 73.4797 | |
| 6 | 88.1757 | |
| 7 | 102.872 |
Show all 14 rowsShow fewer
| 10 | 146.959 | |
| 20 | 293.919 | |
| 50 | 734.797 | |
| 100 | 1,469.59 |
Frequently Asked Questions
How many psi is 1 atm?
1 atm is 14.696 psi, usually rounded to 14.7. It is an absolute pressure: the full weight of the air above you at sea level.
How many psi is 2 atm?
2 atm is 29.39 psi absolute. Subtract the 14.70 psi of the air around you and a gauge would read 14.70 psi, exactly one atmosphere over.
What is the difference between atm and bar?
They are close but not equal. 1 atm is 101,325 Pa and 1 bar is 100,000 Pa, so an atmosphere is about 1.3% bigger. In psi that is 14.70 against 14.50.
Why does a tire gauge read 0 at 1 atm?
Tire gauges measure gauge pressure, which ignores the atmosphere that is already pushing on both sides. A tire at 32 psi on the gauge is at about 46.7 psi absolute, or 3.2 atm.