PSI to Atmospheres Converter
Convert between pounds per square inch (PSI) and atmospheric pressure (atm)
Pressure Conversion Calculator
Common unit in US and UK
Standard atmospheric pressure
Conversion Result
Conversion factor: 1 atmosphere = 14.6959 PSI
Formula: atm = PSI ÷ 14.6959
🚗 Automotive
Tire pressure, engine systems, hydraulic pressure measurements
🏭 Industrial
Pneumatic systems, compressed air, manufacturing processes
🌊 Diving & Aviation
Scuba tanks, cabin pressure, altitude measurements
Common PSI to Atmospheres Conversions
| PSI | Atmospheres | Common Use |
|---|---|---|
| 14.7 psi | 1.00 atm | Sea level atmospheric pressure |
| 30.0 psi | 2.04 atm | Typical car tire pressure |
| 50.0 psi | 3.40 atm | Bicycle tire pressure |
| 100.0 psi | 6.80 atm | High pressure system |
| 150.0 psi | 10.20 atm | Scuba tank pressure (partial) |
| 300.0 psi | 20.40 atm | Industrial application |
| 500.0 psi | 34.00 atm | High pressure cylinder |
| 1000.0 psi | 68.00 atm | Very high pressure |
Quick Reference
1 atm = 101,325 Pascals
Pressure Context
PSI (Pounds per Square Inch)
- • Standard in US and UK
- • Tire pressure: 30-35 psi
- • Water pressure: 40-80 psi
- • Air compressor: 90-150 psi
Atmospheres (atm)
- • Scientific standard unit
- • Sea level: 1 atm (14.7 psi)
- • Diving depth: +1 atm per 10m
- • High altitude: < 1 atm
Conversion Tips
PSI is commonly used for everyday pressure measurements
Atmospheres are standard in scientific contexts
Remember: 1 atm ≈ 15 psi for quick estimates
Absolute vs gauge pressure: gauge excludes atmospheric pressure
Understanding PSI and Atmospheres
What is PSI?
PSI (pounds per square inch) is a unit of pressure commonly used in the United States and United Kingdom. It measures the force applied per unit area, with one pound-force applied to one square inch of area. PSI is widely used in everyday applications like tire pressure, water pressure, and compressed air systems.
Common PSI Applications
- •Tire pressure (cars: 32-35 psi, bikes: 30-120 psi)
- •Household water pressure (40-60 psi)
- •Air compressors (90-150 psi)
- •Hydraulic systems (1,000-10,000 psi)
What is an Atmosphere?
An atmosphere (atm) is a unit of pressure equal to the average atmospheric pressure at sea level. One atmosphere equals 101,325 Pascals or 14.6959 PSI. It's commonly used in scientific contexts, diving calculations, and when discussing pressure in relation to sea level.
Conversion Formula
PSI to atm: atm = PSI ÷ 14.6959
atm to PSI: PSI = atm × 14.6959
Note: This calculator converts absolute pressure. Gauge pressure (commonly used) excludes atmospheric pressure. To convert gauge to absolute, add 1 atm (14.7 psi).
Practical Examples
Car Tire Pressure
Standard: 32 PSI (gauge)
- • Gauge: 32 psi (2.18 atm)
- • Absolute: 46.7 psi (3.18 atm)
- • Always add atm for absolute
Scuba Diving
At 10 meters depth
- • Pressure: 2 atm (29.4 psi)
- • +1 atm per 10m underwater
- • Important for dive planning
High Altitude
At 3,000m elevation
- • Pressure: 0.7 atm (10.3 psi)
- • Lower than sea level
- • Affects cooking & breathing