PSI to Standard Atmosphere Conversion Chart
| Pound per square inch (psi) | Standard Atmosphere (atm) | Reference Benchmark | Formula Step |
|---|---|---|---|
| 1 psi | 0.068046 atm | Standard Imperial One Pound Per Square Inch Unit | 1 × 0.068046 = 0.068046 atm |
| 2 psi | 0.136092 atm | Inflatable Raft Collar Hull Operational Working Pressure | 2 × 0.068046 = 0.136092 atm |
| 5 psi | 0.34023 atm | Residential Low-Pressure Steam Boiler Chamber Level | 5 × 0.068046 = 0.34023 atm |
| 10 psi | 0.68046 atm | Domestic Garden Sprinkler Head Hydrostatic Supply | 10 × 0.068046 = 0.68046 atm |
| 14.69595 psi | 1 atm | Defined Standard Atmospheric Sea Level Pressure Baseline | 14.69595 × 0.068046 = 1 atm |
| 15 psi | 1.02069 atm | Nominal One Atmosphere Common Engineering Approximation | 15 × 0.068046 = 1.02069 atm |
| 20 psi | 1.36092 atm | Lawn Tractor Pneumatic Turf Tire Inflation Pressure | 20 × 0.068046 = 1.36092 atm |
| 29.3919 psi | 2 atm | Ten-Meter Subsurface Ocean Water Hydrostatic Depth | 29.3919 × 0.068046 = 2 atm |
| 32 psi | 2.177472 atm | Standard Family Sedan Recommended Cold Tire Pressure | 32 × 0.068046 = 2.177472 atm |
| 35 psi | 2.38161 atm | Midsize Crossover SUV Standard Cold Tire Inflation Spec | 35 × 0.068046 = 2.38161 atm |
| 44.08785 psi | 3 atm | Twenty-Meter Recreational Scuba Diving Hydrostatic | 44.08785 × 0.068046 = 3 atm |
| 50 psi | 3.4023 atm | Domestic Potable Well Water Pump Cut-Off Switch Level | 50 × 0.068046 = 3.4023 atm |
| 73.47975 psi | 5 atm | Forty-Meter Deep Maritime Diving Ambient Hydrostatic | 73.47975 × 0.068046 = 5 atm |
| 100 psi | 6.8046 atm | Workshop Air Compressor Line Tool Operating Pressure | 100 × 0.068046 = 6.8046 atm |
| 146.9595 psi | 10 atm | Ninety-Meter Technical Trimix Diving Hydrostatic Limit | 146.9595 × 0.068046 = 10 atm |
Pound per square inch to Standard Atmosphere Formula & Unit Definitions
The exact physical identity equates 1 standard atmosphere (101,325 Pa) with 14.695948775 psi. Consequently, 1 psi equals exactly 6,894.757 ÷ 101,325 ≈ 0.06804596 atm (or 1 ÷ 14.69595). To convert psi to atmospheres, multiply the psi value by 0.068046 (or divide by 14.69595). To convert atmospheres back to psi, multiply the atm figure by 14.69595 (or divide by 0.068046).
Quick Estimation: Divide the psi value by 15 for a rapid estimate. For example, 30 psi ÷ 15 = 2 atm (exact is 2.041 atm); 60 psi ÷ 15 = 4 atm (exact is 4.083 atm); 150 psi ÷ 15 = 10 atm (exact is 10.207 atm).
Pounds per Square Inch (psi)
Imperial Engineering Standard- Creator & Origin: Standardized during the Industrial Revolution across Britain and North America for mechanical steam systems.
- Standard Definition: Defined as one pound-force uniformly distributed across one square inch of planar surface area.
- Everyday Focus: Vehicle tire inflation gauges, compressed gas cylinders, hydraulic machinery, and domestic water pipes.
Standard Atmosphere (atm)
Planetary Barometric Baseline- Creator & Origin: Standardized in 1954 by the 10th CGPM as the international reference for mean atmospheric pressure.
- Standard Definition: Defined as exactly 101,325 pascals (1,013.25 mbar or 760 torr of liquid mercury height).
- Everyday Focus: Subsea diving depths, hyperbaric oxygen therapy chambers, high-altitude aviation, and chemical synthesis.
Frequently Asked Questions
Q.How many atmospheres are in one psi?
One psi equals approximately 0.068046 standard atmospheres (atm).
Q.What is the reverse conversion from atmospheres to psi?
To convert back, use the Atmospheres to PSI Converter where 1 atm equals ~14.69595 psi.
Q.How many psi are in 1 standard atmosphere?
There are approximately 14.69595 psi in one standard atmosphere (commonly rounded to 14.7 psi).
Q.What is 30 psi in atmospheres?
30 psi equals approximately 2.04 atmospheres.
Q.What is the difference between psia and psig?
psig is gauge pressure (reads 0 at sea level), while psia is absolute pressure (reads ~14.7 at sea level).