PSI to Atmospheres converter
Quick reference
About pressure units
Pressure units come from different traditions: the pascal is the SI unit but inconveniently small (one newton per square meter), so weather reports use kilopascals or bar, tire gauges in the US use PSI (pounds per square inch), medicine uses mmHg for blood pressure, and diving uses atmospheres, roughly the air pressure at sea level (101,325 Pa exactly). A car tire around 32 PSI is about 2.2 bar; standard blood pressure of 120 mmHg is 16 kPa.
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Frequently asked questions
What is the exact formula for PSI to Atmospheres?
Multiply the PSI value by 0.06804596. This comes from the exact unit definitions, not a rounded approximation.
Is this conversion exact?
The underlying ratio is exact where a legal definition exists (for example, 1 inch = 25.4 mm exactly). Displayed results are rounded to six decimal places for readability.
Can I convert Atmospheres back to PSI?
Yes. Use the reverse converter linked below, or just swap which field you type into: the live converter recalculates either direction.