PSI to Bar Conversion Chart
| Pound per square inch (psi) | Bar (bar) | Reference Benchmark | Formula Step |
|---|---|---|---|
| 1 psi | 0.0689 bar | Single Pound Per Square Inch Hydraulic Reference | 1 × 0.06894757 = 0.068948 bar |
| 2 psi | 0.1379 bar | Low-Pressure Fuel Delivery Tank Line | 2 × 0.06894757 = 0.137895 bar |
| 5 psi | 0.3447 bar | Residential Natural Gas Pressure Regulator | 5 × 0.06894757 = 0.344738 bar |
| 10 psi | 0.6895 bar | HVAC Fan Discharge Air Differential | 10 × 0.06894757 = 0.689476 bar |
| 14.7 psi | 1.0135 bar | Standard Ambient Sea-Level Atmospheric Pressure | 14.7 × 0.06894757 = 1.013529 bar |
| 20 psi | 1.379 bar | Domestic Water Well Expansion Pressure Tank | 20 × 0.06894757 = 1.378951 bar |
| 30 psi | 2.0684 bar | Compact Automobile Tire Inflation Pressure | 30 × 0.06894757 = 2.068427 bar |
| 32 psi | 2.2063 bar | Passenger Sedan Cold Tire Pressure Standard | 32 × 0.06894757 = 2.206322 bar |
| 35 psi | 2.4132 bar | Light SUV Recommended Highway Tire Inflation | 35 × 0.06894757 = 2.413165 bar |
| 40 psi | 2.7579 bar | Residential Municipal Water Mains Line | 40 × 0.06894757 = 2.757903 bar |
| 60 psi | 4.1369 bar | Commercial Building Plumbing Water Pressure | 60 × 0.06894757 = 4.136854 bar |
| 90 psi | 6.2053 bar | Standard Industrial Pneumatic Tool Airline | 90 × 0.06894757 = 6.205281 bar |
| 100 psi | 6.8948 bar | Heavy Truck Air Brake Compressed Header | 100 × 0.06894757 = 6.894757 bar |
| 150 psi | 10.3421 bar | Industrial Steam Boiler Discharge Line | 150 × 0.06894757 = 10.342136 bar |
| 200 psi | 13.7895 bar | High-Pressure Hydraulic Actuator Delivery | 200 × 0.06894757 = 13.789514 bar |
Pound per square inch to Bar Formula & Unit Definitions
Because 1 bar equals exactly 100,000 pascals and 1 psi is standardized at 6,894.757293 pascals, 1 psi equals 6,894.757293 ÷ 100,000 = 0.06894757293 bar (approximately 0.068948 bar). To convert psi to bar, divide the psi value by 14.503774 (or multiply by 0.0689476). To convert bar back into psi, multiply the bar reading by 14.503774.
Quick Estimation: Divide the psi value by 15. For example, 30 psi ÷ 15 = 2.0 bar (exact is 2.068 bar); 60 psi ÷ 15 = 4.0 bar (exact is 4.137 bar).
Pound per Square Inch (psi)
US Customary Standard- Creator & Origin: Standardized in Victorian Britain during steam power expansion and unified under the 1959 treaty.
- Standard Definition: Defined as one avoirdupois pound of force applied perpendicularly across one square inch (1 lbf/in² ≈ 6,894.757 Pa).
- Everyday Focus: US automotive tire inflators (32-35 psi), workshop compressor regulators (90-120 psi), and gas regulators.
Bar Standard (bar)
Metric Engineering Unit- Creator & Origin: Introduced by William Napier Shaw in 1909 and ratified internationally for meteorology and mechanical engineering.
- Standard Definition: Defined as exactly 100,000 pascals (10⁵ Pa), equivalent to 100 kPa or 0.1 MPa.
- Everyday Focus: European car door placards (2.2-2.5 bar), commercial espresso pump group heads (9 bar), and SCUBA tanks (200 bar).
Frequently Asked Questions
Q.How do you convert PSI to bar?
Multiply the PSI value by 0.06894757 or divide by 14.503774.
Q.How many bar is 32 PSI?
32 PSI equals approximately 2.21 bar (commonly rounded to 2.2 bar on vehicle tire placards).
Q.What is the reciprocal conversion for this tool?
The direct reverse tool is the Bar to PSI Converter, where 1 bar equals approximately 14.503774 psi.
Q.Why do tires in Europe use bar instead of PSI?
European and international standards use the metric system, where bar (100 kPa) provides compact single-digit integers for tire pressures (e.g. 2.2 bar).