Convert Pounds per Square Inch to Atmospheres
Instantly convert Pounds per Square Inch (psi) to Atmospheres (atm) with our free online calculator.
Formula: psi to atm — multiply by 0.068046
Reference Table
| Pounds per Square Inch (psi) | Atmospheres (atm) |
|---|---|
| 1 | 0.068046 |
| 5 | 0.34023 |
| 10 | 0.68046 |
| 25 | 1.70115 |
| 50 | 3.4023 |
| 100 | 6.8046 |
How to Convert Pounds per Square Inch to Atmospheres
Formula
To convert Pounds per Square Inch (psi) to Atmospheres (atm): multiply by 0.068046
Step-by-Step
- Start with your value in Pounds per Square Inch (psi).
- Multiply by 0.068046 to perform the conversion.
- The result is your value expressed in Atmospheres (atm).
Conversion Factor
1 psi = 0.068046 atm
Reverse Factor
1 atm = 14.6959 psi
Worked Example
Convert 25 Pounds per Square Inch to Atmospheres: 25 psi = 1.70115 atm
About Pound per Square Inch (psi)
An imperial unit of pressure equal to one pound-force applied over one square inch (exactly 6,894.757 Pa per NIST SP 811). PSI is the dominant US pressure unit and remains the working unit in most US-built industrial, automotive, and consumer equipment: passenger-car tire inflation (32-35 psi cold), compressed air shop systems (typically 100-150 psi), hydraulic equipment (1,500-3,000 psi mobile, up to 10,000 psi on press brakes), ammunition chamber pressures (SAAMI specs in psi), municipal potable water supply (~40-80 psi at the meter), and natural gas distribution pressures. US engineering textbooks and the ASME B31 pipe codes, API piping specifications, and AWWA waterworks standards quote allowable pressures in psi. Engineers should distinguish gauge psi (psig — pressure above atmospheric) from absolute psi (psia — pressure above perfect vacuum); 0 psig = 14.696 psia at sea level. 1 psi = 6.895 kPa = 0.0689 bar = 51.715 mmHg.
About Atmosphere (atm)
A non-SI unit of pressure defined as exactly 101,325 pascals, corresponding to the standard sea-level atmospheric pressure as adopted by ISO 2533 and the BIPM SI Brochure. Atmospheres are the default reference pressure in physical chemistry (Standard Temperature and Pressure conventions: 1 atm at 273.15 K under IUPAC's 'STP' definition, though IUPAC has since moved to 1 bar STP), in commercial diving (depths are quoted in atmospheres absolute, with each 10 m of seawater adding ~1 atm), and in pressure-sensitive materials research where vapor pressure and saturation data are tabulated at 1 atm. A common pitfall: the "technical atmosphere" (at, 98,066.5 Pa = 1 kgf/cm²) used in some legacy European and Japanese engineering is NOT the same as the standard atmosphere — older pressure-vessel drawings can read 100 at and mean either depending on context. 1 atm = 1.01325 bar = 14.696 psi = 760 mmHg = 760 torr.
Quick Facts
- 1 Pound per Square Inch equals 0.068046 Atmospheres
- 1 Atmosphere equals 14.6959 Pounds per Square Inch
- Pound per Square Inch is a unit of pressure
- Atmosphere is a unit of pressure
- This conversion is commonly used in tire inflation, weather reporting, scuba diving, and engineering
- The Pound per Square Inch belongs to the imperial system
Common Pound per Square Inch to Atmosphere Conversions
| Pounds per Square Inch (psi) | Atmospheres (atm) |
|---|---|
| 0.1 | 0.0068046 |
| 0.5 | 0.034023 |
| 1 | 0.068046 |
| 2 | 0.136092 |
| 5 | 0.34023 |
| 10 | 0.68046 |
| 14.696 | 1 |
| 15 | 1.02069 |
| 20 | 1.36092 |
| 25 | 1.70115 |
| 50 | 3.4023 |
| 100 | 6.8046 |
| 150 | 10.2069 |
| 200 | 13.6092 |
| 500 | 34.023 |
| 1000 | 68.046 |
Understanding Pounds per Square Inch
The Pound per Square Inch (symbol: psi) is a unit of pressure. An imperial unit of pressure equal to one pound-force applied over one square inch (exactly 6,894.757 Pa per NIST SP 811). PSI is the dominant US pressure unit and remains the working unit in most US-built industrial, automotive, and consumer equipment: passenger-car tire inflation (32-35 psi cold), compressed air shop systems (typically 100-150 psi), hydraulic equipment (1,500-3,000 psi mobile, up to 10,000 psi on press brakes), ammunition chamber pressures (SAAMI specs in psi), municipal potable water supply (~40-80 psi at the meter), and natural gas distribution pressures. US engineering textbooks and the ASME B31 pipe codes, API piping specifications, and AWWA waterworks standards quote allowable pressures in psi. Engineers should distinguish gauge psi (psig — pressure above atmospheric) from absolute psi (psia — pressure above perfect vacuum); 0 psig = 14.696 psia at sea level. 1 psi = 6.895 kPa = 0.0689 bar = 51.715 mmHg.
It belongs to the imperial measurement system.
Pounds per Square Inch are commonly used in tire inflation, weather reporting, scuba diving, and engineering.
Understanding Atmospheres
The Atmosphere (symbol: atm) is a unit of pressure. A non-SI unit of pressure defined as exactly 101,325 pascals, corresponding to the standard sea-level atmospheric pressure as adopted by ISO 2533 and the BIPM SI Brochure. Atmospheres are the default reference pressure in physical chemistry (Standard Temperature and Pressure conventions: 1 atm at 273.15 K under IUPAC's 'STP' definition, though IUPAC has since moved to 1 bar STP), in commercial diving (depths are quoted in atmospheres absolute, with each 10 m of seawater adding ~1 atm), and in pressure-sensitive materials research where vapor pressure and saturation data are tabulated at 1 atm. A common pitfall: the "technical atmosphere" (at, 98,066.5 Pa = 1 kgf/cm²) used in some legacy European and Japanese engineering is NOT the same as the standard atmosphere — older pressure-vessel drawings can read 100 at and mean either depending on context. 1 atm = 1.01325 bar = 14.696 psi = 760 mmHg = 760 torr.
Atmospheres are commonly used in tire inflation, weather reporting, scuba diving, and engineering.
Why Convert Pounds per Square Inch to Atmospheres?
Engineers, mechanics, and scientists frequently need to convert pressure between Pounds per Square Inch and Atmospheres when working with different measurement standards. Tire pressure, blood pressure readings, weather barometric measurements, and industrial process specifications may all use different pressure units depending on the region or discipline. Reliable conversion prevents equipment misuse and ensures safety.
Frequently Asked Questions
How do I convert Pounds per Square Inch to Atmospheres?
An imperial unit of pressure equal to one pound-force applied over one square inch (exactly 6,894. To convert Pounds per Square Inch to Atmospheres, multiply by 0.068046. For example, 25 psi equals 1.70115 atm.
How many Atmospheres are in 1 Pound per Square Inch?
There are 0.068046 Atmospheres in 1 Pound per Square Inch.
How many Pounds per Square Inch are in 1 Atmosphere?
There are 14.6959 Pounds per Square Inch in 1 Atmosphere.
What is the formula for Pound per Square Inch to Atmosphere conversion?
The formula is: multiply by 0.068046. This means 1 psi = 0.068046 atm.
Is a Pound per Square Inch bigger than a Atmosphere?
Yes. One Pound per Square Inch is larger than one Atmosphere because 1 psi equals 0.068046 atm, which is less than 1.
When do you need to convert between Pounds per Square Inch and Atmospheres?
A non-SI unit of pressure defined as exactly 101,325 pascals, corresponding to the standard sea-level atmospheric pressure as adopted by ISO 2533 and the BIPM SI Brochure. Pound per Square Inch and Atmosphere are both pressure units, so conversion comes up whenever one source of information uses one unit and another uses the other — a classic cross-reference challenge in engineering, trade, travel, and everyday life.