Convert pressure units — Pascal, bar, PSI, atm, Torr, mmHg.
| Unit | Name | Value |
|---|---|---|
| Pa | Pascal | 6894.76 |
| kPa | Kilopascal | 6.89476 |
| bar | Bar | 0.0689476 |
| atm | Atmosphere | 0.068045991 |
| Torr | Torr / mmHg | 51.715096 |
| inHg | Inch of Mercury | 2.0360207 |
Formula: Atmosphere = PSI × 0.06805
Multiply any psi value by 0.06805 to get atmosphere.
Reverse: PSI = Atmosphere × 14.7
Common psi values — factor: 1 psi = 0.06805 atm
| PSI (psi) | Atmosphere (atm) | Context |
|---|---|---|
| 0.1 psi | 0.006805 atm | Very low gauge |
| 1 psi | 0.06805 atm | Low tire |
| 5 psi | 0.3402 atm | Bike inner tube low |
| 10 psi | 0.6805 atm | Low hydraulic |
| 14.7 psi | 1 atm | 1 atm |
| 20 psi | 1.361 atm | Soft tire |
| 30 psi | 2.041 atm | Car tire low |
| 35 psi | 2.382 atm | Car tire normal |
| 60 psi | 4.083 atm | Truck tire |
| 100 psi | 6.805 atm | Medium hydraulic |
| 150 psi | 10.21 atm | High hydraulic |
| 1,000 psi | 68.05 atm | Industrial |
| 3,000 psi | 204.1 atm | Scuba cylinder |
| 6,000 psi | 408.3 atm | High-pressure cylinder |
| 1.5e+04 psi | 1,021 atm | Waterjet |
PSI ÷ 14.696 = atm. Round to ÷ 14.7.
Quick mental anchor — only 2% error.
atm × 14.696 = psi.
Inflates and checks car, truck, and bicycle tires to specified psi pressures.
Specifies refrigerant pressures and system test pressures in psi for US equipment.
Designs hydraulic systems rated in psi for American industrial machinery.
Monitors tank pressure (3,000 psi fill) and reserve pressure on US-spec gauges.
Specifies pipe pressure ratings and test pressures in psi for US plumbing codes.
Checks oil pressure (35–65 psi), coolant pressure, and brake line pressure in psi.
PSI (pounds per square inch) is the primary pressure unit in the United States, UK, and other countries using Imperial measures. It equals the force of one pound-force applied over one square inch of area (6,894.76 Pa).
PSI is used for tire pressure (car: 30–35 psi, truck: 80–120 psi), blood pressure measurement in the US, boiler pressure ratings, and hydraulic system specifications in American engineering.
Interesting fact: The deepest ocean dive by a human (Victor Vescovo, 2019, 10,928 m) would have experienced about 15,900 psi of external pressure on the submersible hull.
The atmosphere (atm) is defined as exactly 101,325 pascals — the approximate air pressure at sea level. It was originally defined as the average atmospheric pressure at sea level at 45° latitude, and has been a standard reference since the 17th century.
Atmospheres are used in chemistry (gas laws), scuba diving depth calculations (every 10 m of water ≈ 1 additional atm), and as a convenient reference for extreme pressure comparisons.
Interesting fact: Jupiter's atmosphere has pressures exceeding 1,000 atm at depth. Diamond formation in Earth's mantle requires pressures of 45,000–60,000 atm at depths of 150–200 km.
Converting psi to atmosphere is a common task in engineering, medicine, meteorology, and science. Different industries and countries use different pressure units — PSI in the US, bar in Europe, mmHg in medicine, and pascals in physics — making accurate conversion essential for cross-disciplinary work.
Quick reference: 5 psi = 0.3402 atm and 10 psi = 0.6805 atm. For the reverse: 1 atm = 14.7 psi. The exact factor is 1 psi = 0.06805 atm.
All conversions use IEEE 754 double-precision arithmetic, accurate to at least 8 significant figures.