PSI to ATM Conversion
Convert PSI to ATM instantly with this free online pressure converter. Enter any pounds per square inch value and get the precise ATM equivalent using 1 PSI = 0.068046 atm. Ideal for engineering, scuba diving, and industrial applications.
About This Calculator
Our PSI to ATM conversion calculator provides instant, accurate conversions between pounds per square inch (PSI) and standard atmospheres (ATM). Whether you are an engineer working with pressure systems, a scuba diver calculating tank pressures, or a researcher handling precise pressure measurements, this free online tool delivers reliable results in seconds.
PSI (pounds per square inch) is the imperial unit of pressure predominantly used in the United States and Canada for tire pressure, hydraulic systems, industrial equipment, and water pressure. The standard atmosphere (ATM) is a metric reference unit representing the average atmospheric pressure at sea level, equal to 101,325 pascals. The conversion between these two units follows the formula: ATM = PSI × 0.068046. Conversely, to convert ATM to PSI, use PSI = ATM / 0.068046 or PSI = ATM × 14.6959.
1 standard atmosphere is defined as exactly 14.6959 PSI. This means that at sea level, the atmospheric pressure of approximately 14.7 PSI equals about 1 ATM. The conversion factor 0.068046 is derived from the relationship: 1 ATM = 101,325 Pa and 1 PSI = 6,894.76 Pa, giving 101,325 / 6,894.76 ≈ 14.6959 PSI per ATM, and its reciprocal 1 / 14.6959 ≈ 0.068046 ATM per PSI.
Regional Notes
United States: PSI is the standard unit for tire pressure (typically 30-35 PSI for passenger cars), scuba tanks (3,000 PSI), and building water pressure (40-80 PSI). ATM is used in diving to express depth pressure (every 33 ft of seawater adds 1 ATM).
United Kingdom: While the UK officially uses the metric system, PSI remains common in automotive tire pressure gauges and some industrial applications. ATM is used in scientific contexts and scuba diving.
India: India uses the metric system (bar, kPa) for most official pressure measurements, but PSI is still found on imported equipment, tire pressure gauges, and older industrial machinery. ATM is primarily used in academic and scientific settings.
Frequently Asked Questions
How do I convert PSI to ATM?
To convert pounds per square inch (PSI) to standard atmospheres (ATM), multiply the PSI value by 0.068046. For example, 14.7 PSI × 0.068046 = 1.0003 ATM, which is approximately 1 standard atmosphere at sea level.
What is the formula for PSI to ATM conversion?
The formula is ATM = PSI × 0.068046, where 0.068046 is the conversion factor from pounds per square inch to standard atmospheres. One standard atmosphere equals exactly 14.6959 PSI.
What is the equivalent pressure in PSI for 1 ATM?
One standard atmosphere (ATM) is equivalent to approximately 14.6959 PSI (pounds per square inch). This value represents the average atmospheric pressure at sea level on Earth.
What is PSI used for?
PSI (pounds per square inch) is widely used in the United States and Canada for measuring tire pressure, scuba tank pressure, hydraulic systems, industrial equipment pressure ratings, and water pressure in plumbing systems.
What is an atmosphere (ATM) used for?
Standard atmosphere (ATM) is used as a reference pressure in physics, chemistry, engineering, and meteorology. It represents the average atmospheric pressure at sea level (101,325 Pa) and is commonly used for calculating gas behavior, pressure conversions, and underwater pressure in scuba diving.
Can I convert ATM back to PSI using this tool?
Yes, this calculator supports bidirectional conversion. Enter a value in PSI to get ATM, or enter a value in ATM to get PSI. The reverse formula is PSI = ATM / 0.068046, or equivalently PSI = ATM × 14.6959.
Is this PSI to ATM conversion tool free?
Yes, all calculators on Calculy are completely free to use with no registration, downloads, or hidden fees. You can use the PSI to ATM converter as many times as you need.