Convert Atmospheres to Pounds per Square Inch
Instantly convert Atmospheres (atm) to Pounds per Square Inch (psi) with our free online calculator.
Formula: atm to psi — multiply by 14.6959
Reference Table
| Atmospheres (atm) | Pounds per Square Inch (psi) |
|---|---|
| 1 | 14.6959 |
| 5 | 73.4797 |
| 10 | 146.959 |
| 25 | 367.399 |
| 50 | 734.797 |
| 100 | 1469.59 |
How to Convert Atmospheres to Pounds per Square Inch
Formula
To convert Atmospheres (atm) to Pounds per Square Inch (psi): multiply by 14.6959
Step-by-Step
- Start with your value in Atmospheres (atm).
- Multiply by 14.6959 to perform the conversion.
- The result is your value expressed in Pounds per Square Inch (psi).
Conversion Factor
1 atm = 14.6959 psi
Reverse Factor
1 psi = 0.068046 atm
Worked Example
Convert 25 Atmospheres to Pounds per Square Inch: 25 atm = 367.399 psi
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.
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.
Quick Facts
- 1 Atmosphere equals 14.6959 Pounds per Square Inch
- 1 Pound per Square Inch equals 0.068046 Atmospheres
- Atmosphere is a unit of pressure
- Pound per Square Inch 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 Atmosphere to Pound per Square Inch Conversions
| Atmospheres (atm) | Pounds per Square Inch (psi) |
|---|---|
| 0.1 | 1.46959 |
| 0.5 | 7.34797 |
| 1 | 14.6959 |
| 2 | 29.3919 |
| 5 | 73.4797 |
| 10 | 146.959 |
| 14.696 | 215.972 |
| 15 | 220.439 |
| 20 | 293.919 |
| 25 | 367.399 |
| 50 | 734.797 |
| 100 | 1469.59 |
| 150 | 2204.39 |
| 200 | 2939.19 |
| 500 | 7347.97 |
| 1000 | 14695.9 |
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.
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.
Why Convert Atmospheres to Pounds per Square Inch?
Engineers, mechanics, and scientists frequently need to convert pressure between Atmospheres and Pounds per Square Inch 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 Atmospheres to Pounds per Square Inch?
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. To convert Atmospheres to Pounds per Square Inch, multiply by 14.6959. For example, 25 atm equals 367.399 psi.
How many Pounds per Square Inch are in 1 Atmosphere?
There are 14.6959 Pounds per Square Inch in 1 Atmosphere.
How many Atmospheres are in 1 Pound per Square Inch?
There are 0.068046 Atmospheres in 1 Pound per Square Inch.
What is the formula for Atmosphere to Pound per Square Inch conversion?
The formula is: multiply by 14.6959. This means 1 atm = 14.6959 psi.
Is a Atmosphere bigger than a Pound per Square Inch?
No. One Atmosphere is smaller than one Pound per Square Inch because 1 atm equals 14.6959 psi, which is greater than 1.
When do you need to convert between Atmospheres and Pounds per Square Inch?
An imperial unit of pressure equal to one pound-force applied over one square inch (exactly 6,894. Atmosphere and Pound per Square Inch 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.