This converter turns atmospheres into pounds per square inch instantly, using the exact factor 1 atmosphere = 14.69594878 pounds per square inch. Type any number and the result updates as you go — nothing is sent to a server, so the arithmetic happens entirely in your browser.
Standard atmospheric pressure by definition — 101,325 pascals exactly. The dominant US pressure unit for tyres, plumbing and compressors.
Because the relationship is a simple proportion, one multiplication does the whole job. The table further down gives pre-computed values for the amounts people look up most often, and the result panel also reports the reverse conversion so you can check the figure both ways.
The formula
atmospheres- The amount you are converting, measured in atmospheres
14.69594878- The exact number of pounds per square inch in one atmosphere
pounds per square inch- The converted result
How it works, step by step
- Enter the number of atmospheres you want to convert.
- The value is multiplied by 14.69594878, the exact conversion factor.
- The result is displayed in pounds per square inch, rounded for readability.
- The unrounded value and the reverse conversion appear underneath so you can verify it.
Worked examples
Converting 5 atmospheres
Multiply 5 by 14.695949. That gives 73.4797 pounds per square inch. A quick sanity check: one atmosphere is larger than one pound per square inch, so the number should get bigger — and it does.
Converting 72 atmospheres
72 × 14.695949 = 1,058.11 pounds per square inch. Working backwards, 1,058.11 ÷ 14.695949 returns 72 atmospheres, which confirms the factor is applied the right way round.
How to read your score
Frequently asked questions
How many pounds per square inch are in one atmosphere?
Exactly 14.69594878. Every conversion on this page is that single number multiplied by your input, so the result carries no rounding error beyond what is shown.
What is the formula to convert atmospheres to pounds per square inch?
Pounds Per Square Inch = atmospheres × 14.69594878. To reverse it, divide instead: atmospheres = pounds per square inch ÷ 14.69594878, which is the same as multiplying by 0.06804596391.
Is the atmosphere bigger than the pound per square inch?
Yes. One atmosphere equals 14.6959 pounds per square inch, so it is the larger unit.
Why does my answer differ slightly from other atmospheres to psi converters?
Most differences come from rounding the factor too early. This tool keeps full double precision through the calculation and only rounds at the final display step, and it also shows the unrounded value so you can see exactly where any difference appears.
What is a atmosphere?
Standard atmospheric pressure by definition — 101,325 pascals exactly.
What is a pound per square inch?
The dominant US pressure unit for tyres, plumbing and compressors.
Atmospheres to pounds per square inch reference table
| Atmospheres | Pounds Per Square Inch |
|---|---|
| 0.5 atm | 7.348 psi |
| 1 atm | 14.6959 psi |
| 2 atm | 29.3919 psi |
| 3 atm | 44.0878 psi |
| 5 atm | 73.4797 psi |
| 10 atm | 146.9595 psi |
| 15 atm | 220.4392 psi |
| 20 atm | 293.919 psi |
| 25 atm | 367.3987 psi |
| 50 atm | 734.7974 psi |
| 75 atm | 1,102.2 psi |
| 100 atm | 1,469.59 psi |
| 250 atm | 3,673.99 psi |
| 500 atm | 7,347.97 psi |
| 1000 atm | 14,695.95 psi |
Exact factor: 1 atmosphere = 14.69594878 pounds per square inch. Values rounded for display.