Convert PSI to Atmospheres
Convert PSI to Atmospheres instantly. 1 PSI (psi) equals 0.06805 Atmospheres (atm).
PSI to Atmospheres conversion table
| PSI (psi) | Atmospheres (atm) |
|---|---|
| 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 |
| 50 psi | 3.4023 atm |
| 100 psi | 6.8046 atm |
| 500 psi | 34.023 atm |
| 1,000 psi | 68.046 atm |
1 PSI = 0.06805 Atmospheres · multiply PSI by 0.06805
About converting PSI to Atmospheres
PSI (psi) and Atmospheres (atm) are both units of pressure, so converting between them is a single multiplication: multiply your PSI figure by 0.06805. Ten PSI comes to 0.6805 Atmospheres, and a hundred works out at 6.8046 Atmospheres.
Rule of thumb: going from PSI to Atmospheres divides, so the figure always shrinks — it takes about 14.6959 PSI to make a single Atmosphere. If your answer came out bigger, you have the conversion the wrong way round.
What is a PSI?
Pounds per square inch is the pressure unit Americans actually meet: on the gauge at the filling-station air pump, on compressors, on hydraulic equipment, and on the sidewall of every tyre sold in the country. It survives in British tyre pressures too, despite nearly everything else there having gone metric. Structurally it is exactly what the name says — a pound-force resting on a square inch — and that heritage is also its weakness, because it inherits the pound-force and with it the old confusion between pounds as weight and pounds as mass.
What is an Atmosphere?
The standard atmosphere is a defined reference rather than a working unit: a figure fixed by agreement at roughly what the air presses at sea level on an ordinary day. Nobody sets a gauge to it. Instead it is the yardstick other pressures are described against — divers count depth in atmospheres, chemists specify reactions at one atmosphere, and test standards quote pressures as multiples of it. Because it is a defined number rather than a measured one, the real pressure outside almost never equals exactly one atmosphere; it wanders with the weather, which is what a barometer is telling you.
To put both in perspective: a car tyre is usually inflated to about 32 psi, while the pressure 10 metres underwater is about 2 atmospheres.
The converter above updates as you type, and the table lists common values for quick reference. Need the opposite direction? Use the Atmospheres to PSI converter, or browse all Pressure converters.
Frequently asked questions
How many Atmospheres are in one PSI?
There are 0.06805 Atmospheres in one PSI.
How do I convert PSI to Atmospheres?
Multiply the number of PSI by 0.06805. For example, 10 PSI = 0.6805 Atmospheres.
What is 100 PSI in Atmospheres?
100 PSI is equal to 6.8046 Atmospheres.
How do I convert Atmospheres to PSI?
Multiply the Atmospheres value by 14.6959 (or divide by 0.06805).
Is this PSI to Atmospheres conversion exact?
The definition is exact — PSI and Atmospheres are both fixed against the same base by international agreement — but the decimal shown here is rounded for readability, because the true ratio does not terminate. For engineering or scientific work, carry more decimal places than this page displays.
What is a PSI?
Pounds per square inch is the pressure unit Americans actually meet: on the gauge at the filling-station air pump, on compressors, on hydraulic equipment, and on the sidewall of every tyre sold in the country. It survives in British tyre pressures too, despite nearly everything else there having gone metric. Structurally it is exactly what the name says — a pound-force resting on a square inch — and that heritage is also its weakness, because it inherits the pound-force and with it the old confusion between pounds as weight and pounds as mass.
What is an Atmosphere?
The standard atmosphere is a defined reference rather than a working unit: a figure fixed by agreement at roughly what the air presses at sea level on an ordinary day. Nobody sets a gauge to it. Instead it is the yardstick other pressures are described against — divers count depth in atmospheres, chemists specify reactions at one atmosphere, and test standards quote pressures as multiples of it. Because it is a defined number rather than a measured one, the real pressure outside almost never equals exactly one atmosphere; it wanders with the weather, which is what a barometer is telling you.