Atm to PSI Converter
Convert standard atmosphere to pound per square inch instantly. 1 atm = 14.69594878 psi, worked steps and a full reference table.
How to use it
- Type the value in standard atmosphere — the result updates as you type.
- Use Swap to flip the direction, or change either dropdown to convert between any two units.
- Click the result to copy it. The URL updates too, so you can bookmark or share the exact conversion.
Examples
| 1 atm | 14.69594878 psi |
| 5 atm | 73.47974388 psi |
| 10 atm | 146.9594878 psi |
| 100 atm | 1469.594878 psi |
One standard atmosphere equals 14.695949 pound per square inches (psi). To convert standard atmospheres to pound per square inches, multiply by 14.695949; to go back the other way, multiply by 0.068045964 instead.
The converter above does it as you type and shows the working underneath, so you can check the arithmetic rather than take the number on trust.
What standard atmospheres and pound per square inches actually measure
Standard atmosphere (atm) — A standard atmosphere is 101,325 pascals — average sea-level pressure. Chemistry and diving.
Pound per square inch (psi) — Pounds per square inch. Tyre pressures, air compressors and plumbing in the US.
Atm to PSI conversion table
The most common values, worked out in advance. Anything not listed can be typed straight into the converter.
| atm | psi |
|---|---|
| 1 atm | 14.695949 psi |
| 2 atm | 29.391898 psi |
| 5 atm | 73.479744 psi |
| 10 atm | 146.95949 psi |
| 25 atm | 367.39872 psi |
| 50 atm | 734.79744 psi |
| 100 atm | 1469.5949 psi |
How to convert standard atmospheres to pound per square inches by hand
Multiply the number of standard atmospheres by 14.695949.
For example, 25 atm × 14.695949 = 367.39872 psi.
Going the other way, divide by 14.695949 — or multiply by 0.068045964, which is the same thing and easier to do in your head.
Everything runs in your browser
There is no server involved in the calculation. The numbers you type never leave your device, nothing is logged, and the page keeps working with no connection once it has loaded. That is not a marketing line — it is simply how the tool is built, because a calculation like this has no reason to touch a network.
Questions people ask
How many psi are in 1 atm?
1 atm equals exactly 14.69594878 psi. Multiply any value in standard atmosphere by 14.69594878 to get pound per square inch.
Is anything uploaded to a server?
No. The whole calculation happens in your browser. Nothing is sent anywhere, and the page keeps working offline once loaded.
Last updated 18 August 2026