Bar to PSI Conversion Chart
| Bar (bar) | Pound per square inch (psi) | Reference Benchmark | Formula Step |
|---|---|---|---|
| 0.1 bar | 1.45 psi | Low-Pressure Air Duct Static Differential | 0.1 × 14.503774 = 1.450377 psi |
| 0.5 bar | 7.25 psi | Automotive Turbocharger Intake Low Boost | 0.5 × 14.503774 = 7.251887 psi |
| 1 bar | 14.5 psi | Standard Ambient Sea-Level Reference Unit | 1 × 14.503774 = 14.503774 psi |
| 1.5 bar | 21.76 psi | Commercial Building Fire Sprinkler Standby Supply | 1.5 × 14.503774 = 21.755662 psi |
| 2 bar | 29.01 psi | Passenger Car Compact Spare Tire Inflation | 2 × 14.503774 = 29.007549 psi |
| 2.2 bar | 31.91 psi | Standard European Sedan Cold Tire Benchmark | 2.2 × 14.503774 = 31.908304 psi |
| 2.5 bar | 36.26 psi | Municipal Potable Water Mains Delivery | 2.5 × 14.503774 = 36.259436 psi |
| 3 bar | 43.51 psi | Domestic Hydronic Heating Closed Boiler Circuit | 3 × 14.503774 = 43.511323 psi |
| 4 bar | 58.02 psi | Light Industrial Pneumatic Assembly Tool Feed | 4 × 14.503774 = 58.015098 psi |
| 6 bar | 87.02 psi | Standard Workshop Compressed Air Workshop Loop | 6 × 14.503774 = 87.022646 psi |
| 8 bar | 116.03 psi | Heavy Commercial Truck Air Brake Reservoir | 8 × 14.503774 = 116.030195 psi |
| 10 bar | 145.04 psi | Commercial Espresso Pump Grouphead Delivery | 10 × 14.503774 = 145.037744 psi |
| 15 bar | 217.56 psi | Industrial Steam Heat Recovery Boiler Header | 15 × 14.503774 = 217.556616 psi |
| 20 bar | 290.08 psi | High-Pressure Gas Delivery Secondary Regulator | 20 × 14.503774 = 290.075488 psi |
| 25 bar | 362.59 psi | Hydraulic Fluid Return Line System Circuit | 25 × 14.503774 = 362.59436 psi |
Bar to Pound per square inch Formula & Unit Definitions
Because 1 bar equals exactly 100,000 pascals and 1 psi is legally defined as approximately 6,894.757293 pascals, 1 bar equals exactly 100,000 ÷ 6,894.757293 ≈ 14.50377377 psi. To convert bar to psi, multiply the bar reading by 14.503774 (or divide by 0.0689476). To convert psi back to bar, multiply the psi value by 0.0689476 (or divide by 14.503774).
Quick Estimation: Multiply the bar value by 15, then subtract roughly 3% of the result. For example, 2 bar × 15 = 30 psi; subtracting ~1 psi gives ~29 psi (exact is 29.01 psi).
Bar Standard (bar)
Metric Engineering Unit- Creator & Origin: Introduced in 1909 by William Napier Shaw and formalized internationally in 1914 for atmospheric and fluid physics.
- Standard Definition: Defined as exactly 100,000 pascals (10⁵ Pa), equivalent to 100 kPa or 0.1 MPa.
- Everyday Focus: European car tire ratings (2.2-2.5 bar), espresso extraction pumps (9-15 bar), and scuba tanks (200-300 bar).
Pound per Square Inch (psi)
US Customary Standard- Creator & Origin: Developed during the British Industrial Revolution and standardized across the English-speaking world by the 1959 treaty.
- Standard Definition: Defined as one avoirdupois pound of force applied perpendicularly over one square inch (1 lbf/in² ≈ 6,894.757 Pa).
- Everyday Focus: US vehicle tire gauges (32-36 psi), residential water pressure regulators (50-60 psi), and shop air tools (90 psi).
Frequently Asked Questions
Q.How do you convert bar to PSI?
Multiply the bar value by 14.503774.
Q.How many PSI is 1 bar?
Exactly 1 bar equals approximately 14.5038 pounds per square inch (PSI).
Q.What is the reciprocal conversion for this tool?
The direct reverse tool is the PSI to Bar Converter, where 1 psi equals approximately 0.068948 bar.
Q.What is 2.2 bar tire pressure in PSI?
2.2 bar equals approximately 31.91 PSI (commonly rounded to 32 PSI on automotive tire gauges).