Convert atm to psi

1. How to convert atm to psi

The conversion is a single multiplication: psi = atm × 14.6959487755. Both units are defined against the same base — the pascal (Pa) — so the factor is fixed and the result is exact to the precision shown.

Worked at the two values people ask for most: 1 atm = 14.695949 psi and 32 atm = 470.27036 psi. Going the other way, atm = psi × 0.0680459639099, so 1 psi = 0.068045964 atm.

Results are given to eight significant figures. That is more precision than most jobs need — for a rough figure, treat 1 atm as about 14.695949 psi and adjust — but rounding early and multiplying afterwards is how a small error becomes a visible one, so the full figure is what the converter carries.

2. Standard atmospheres to Pounds per square inch conversion table

Every row is the same factor applied — nothing in the table is a special case, and any value in between behaves the same way. Type your own figure into the converter above and the Formula tile shows the arithmetic being used, so the result is checkable rather than taken on trust.

3. What the two units are

• Standard atmospheres (atm). One atm is 101,325 Pa.
• Pounds per square inch (psi). One psi is 6,894.7573 Pa.

Both are converted through the pascal (Pa): the value is multiplied by its own unit's factor to reach the base, then divided by the target unit's factor to leave it. No direct atm to psi factor has to exist or be kept correct, which is also why the converter can show the same value in all 10 pressure units at once.

Pressure converts through the pascal, which is one newton per square metre and a very small unit — hence the kilopascal and the bar (exactly 100,000 Pa) in practical use. One standard atmosphere is exactly 101,325 Pa. Whether your figure is absolute or gauge pressure is a property of the instrument, not of the arithmetic.

If the pair you actually want is not this one, the full unit converter runs every 10 pressure units off the same factor table, along with 11 other categories of measurement.