Convert Atmospheres to Pounds per square inch

To convert atmospheres (atm) to pounds per square inch (psi), use a fixed pressure conversion factor.

• Conversion factor: 1 atm = 14.6959 psi (often rounded to 14.7 psi)
• Formula: psi = atm × 14.6959

Example:

• 2 atm × 14.6959 = 29.3918 psi (about 29.4 psi)

Quick checks to catch mistakes:

• The units should cancel. Write it as: atm × (psi ÷ atm) so atm drops out.
• Since 1 atm equals about 14.7 psi, the psi value should be larger than the atm value for the same pressure.

What is the conversion from atmospheres (atm) to pounds per square inch (psi)?

1 atmosphere equals 14.6959 psi (often rounded to 14.7 psi).
To convert atm to psi, multiply the atm value by 14.6959.

How do you convert psi to atm?

To convert psi to atm, divide the psi value by 14.6959.
Example: 29.4 psi ÷ 14.6959 ≈ 2.00 atm.

Why is 1 atm equal to about 14.7 psi?

One atmosphere is based on standard sea-level air pressure. That same pressure equals about 14.7 pounds of force per square inch. The psi value comes from the same pressure written in different units.

What’s the difference between atm, psi, and bar?

• atm is a standard pressure unit based on sea-level pressure.
• psi measures pressure as pounds of force on one square inch.
• bar is a metric pressure unit used in many countries.
  Common reference: 1 atm = 14.6959 psi ≈ 1.01325 bar.

Is atm the same as absolute pressure?

Yes, atm is an absolute pressure unit. It measures pressure compared to a perfect vacuum. This matters in physics, gas laws, and lab work.

Is psi always gauge pressure?

Not always. Psi can be gauge (psig) or absolute (psia).

• psig measures pressure above local air pressure.
• psia measures pressure above a vacuum.
  When converting, make sure both values use the same type (absolute or gauge).

How do you convert atm to psi for tire pressure?

Tire pressure is almost always gauge pressure (psig). Standard atm is absolute, so you need to match types. If you only need a rough conversion, multiply atm by 14.7 and treat it as psi, but this can be off when gauge vs absolute matters.

How many psi are in 2 atm, 3 atm, or 5 atm?

Using 1 atm = 14.6959 psi:

• 2 atm = 29.3918 psi
• 3 atm = 44.0877 psi
• 5 atm = 73.4795 psi

How accurate is the 14.7 psi per atm rounding?

Rounding to 14.7 psi is fine for quick estimates. Use 14.6959 psi when you need more exact results, like lab data, engineering work, or tight specs.

Does temperature affect converting atm to psi?

No. The unit conversion between atm and psi is fixed. Temperature changes can affect the pressure in a system, but they don’t change how atm converts to psi.

What is standard atmospheric pressure in psi?

Standard atmospheric pressure is 1 atm, which equals 14.6959 psi. Many charts round this to 14.7 psi.

What is the formula to convert atm to psi?

Use this formula:
psi = atm × 14.6959
For a quick estimate, you can use:
psi ≈ atm × 14.7