Standard atmospheres to pounds-force per square inch (atm to psi)
Convert standard atmospheres to pounds-force per square inch. For pressure, 1 atm equals 14.69594878 psi.
Converter
atm to psi conversion table
| Standard atmospheres | Pounds-force per square inch |
|---|---|
| 1 atm | 14.695949 psi |
| 2 atm | 29.391898 psi |
| 5 atm | 73.479744 psi |
| 10 atm | 146.95949 psi |
| 25 atm | 367.39872 psi |
| 50 atm | 734.79744 psi |
| 100 atm | 1469.5949 psi |
| 1000 atm | 14695.949 psi |
Formula
psi = atm × 14.69594878
Worked example
25 atm × 14.69594878 = 367.3987194 psi
Popular conversion examples
Choose an example to open this converter with the value filled in. These are useful examples, not a claim about search rankings.
- 1 atm to psi = 14.6959 psi
- 5 atm to psi = 73.4797 psi
- 100 atm to psi = 1469.59 psi
- 10 atm to psi = 146.959 psi
- 75 psi to atm = 5.10345 atm
- 1 psi to atm = 0.068046 atm
About standard atmospheres and pounds-force per square inch
Standard atmosphere (atm)
A standard atmosphere is exactly 101,325 pascals. It is used as a reference pressure in chemistry, physics and diving.
Pound-force per square inch (psi)
Pound-force per square inch is about 6,894.757 pascals. It is used for tire pressure and hydraulic and pneumatic systems in the US.
Both are units of pressure; the base unit used internally is Pa.
Notes
- Standard atmosphere = 101,325 Pa; bar = 100,000 Pa; psi = pound-force per square inch using standard gravity (≈ 6894.757 Pa).
- mmHg is the conventional millimeter of mercury (133.322387415 Pa) and the torr is exactly 1/760 of a standard atmosphere (≈ 133.3224 Pa); the two differ by about 0.000014 %.
- Absolute and gauge pressure are not distinguished: no gauge offset is applied. Negative values are accepted so that gauge vacuum readings can be converted.
atm to psi FAQs
How do I convert standard atmospheres to pounds-force per square inch?
Multiply the number of standard atmospheres by 14.69594878 to get pounds-force per square inch. For example, 25 atm × 14.69594878 = 367.399 psi.
How many pounds-force per square inch are in one standard atmosphere?
1 atm = 14.69594878 psi and 1 psi = 0.06804596391 atm. To go the other way, use the pounds-force per square inch to standard atmospheres converter.
How many pounds-force per square inch are in 10 standard atmospheres?
10 atm = 146.959 psi, rounded to 6 significant digits. Change the value in the converter above for any other amount.
Is the atm to psi conversion exact?
The ratio is exact by definition, but its decimal form does not end (14.6959487755… to 12 significant digits). The converter keeps full precision internally and rounds only the displayed answer, which you can set from 4 to 12 significant digits.
What is the difference between standard atmospheres and pounds-force per square inch?
A standard atmosphere is exactly 101,325 pascals. It is used as a reference pressure in chemistry, physics and diving. Pound-force per square inch is about 6,894.757 pascals. It is used for tire pressure and hydraulic and pneumatic systems in the US.
Does this handle gauge pressure (psig) or absolute pressure (psia)?
The converter changes units only and does not add or remove atmospheric pressure. A reading of 30 atm is 440.878 psi in whichever reference (gauge or absolute) it was measured; to move between gauge and absolute, add or subtract about 14.6959 psi (one standard atmosphere) yourself.
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