Atmospheres to pounds per square inch
Multiply atmospheres by 14.6959 to get pounds per square inch.
5 atm = 73.4797 psi
How to convert atmospheres to pounds per square inch
The pound per square inch is pounds-force per square inch, exactly 6894.757293168 pascals. The atmosphere is the standard atmosphere, exactly 101 325 pascals.
Worked example — 5 atm: 5 × 14.6959 = 73.4797 psi.
Atmospheres to pounds per square inch table
| Atmospheres | Pounds per square inch |
|---|---|
| 0.5 atm | 7.348 psi |
| 1 atm | 14.6959 psi |
| 2 atm | 29.3919 psi |
| 3 atm | 44.0878 psi |
| 5 atm | 73.4797 psi |
| 10 atm | 146.9595 psi |
| 20 atm | 293.919 psi |
| 50 atm | 734.7974 psi |
| 100 atm | 1,469.5949 psi |
Reverse and related
About atmospheres and pounds per square inch
Atmosphere (atm)
1 atm = 14.6959 psiDefinition. The standard atmosphere, exactly 101 325 pascals
History and origin
The standard atmosphere was defined as a reference pressure of exactly 101 325 pascals, close to average pressure at sea level. It gave a convenient benchmark before the pascal became standard.
Current use
Atmospheres are used in diving, chemistry and when describing pressure at altitude.
Source: NIST SP 811, App. B; ISO 80000-4. Exact SI values are definitional (bar = 10⁵ Pa, atm = 101 325 Pa) or derived from the pound (NIST HB 44) and standard gravity 9.80665 m/s² (psi)
Pound per square inch (psi)
1 psi = 0.068046 atmDefinition. Pounds-force per square inch, exactly 6894.757293168 pascals
History and origin
The pound per square inch comes from the imperial system, expressing pressure as pounds-force spread over a square inch. It equals about 6895 pascals.
Current use
Psi is the everyday pressure unit in the United States for tyre pressure, plumbing and compressed air.
Source: NIST SP 811, App. B; ISO 80000-4. Exact SI values are definitional (bar = 10⁵ Pa, atm = 101 325 Pa) or derived from the pound (NIST HB 44) and standard gravity 9.80665 m/s² (psi)
Where people use this
Atmospheres: diving, chemistry, altitude. Pounds per square inch: tyre pressure in the US, plumbing, compressed air. 1 atm is about 14.7 psi.
Every value is carried to full double precision; the display is rounded.
Both units are defined in NIST SP 811, App. B; ISO 80000-4. Exact SI values are definitional (bar = 10⁵ Pa, atm = 101 325 Pa) or derived from the pound (NIST HB 44) and standard gravity 9.80665 m/s² (psi).
Questions people ask
How many psi is 1 atm?
One atmosphere is about 14.7 psi.
How many psi is 2 atm?
2 atm is about 29.4 psi.
What is standard atmospheric pressure?
One standard atmosphere is 101,325 Pa, about 14.7 psi.