Bar To PSIG Conversion
Convert bars (bar) to pounds per square inch gauge (PSIG) instantly with this free online pressure converter. Formula: PSIG = (bar × 14.5038) - 14.7.
About This Calculator
This Bar to PSIG Conversion Calculator is a free online tool that converts pressure values from bars (bar) to pounds per square inch gauge (PSIG). It is designed for engineers, HVAC technicians, automotive professionals, industrial workers, and anyone who needs accurate pressure conversions between metric and imperial gauge pressure units.
The conversion uses the standard formula: PSIG = (bar × 14.5038) - 14.7. First, the bar value is multiplied by 14.5038 to convert to pounds per square inch (PSI), then 14.7 psi (standard atmospheric pressure at sea level) is subtracted to obtain gauge pressure. Gauge pressure measures pressure relative to the surrounding atmosphere, which is what most pressure gauges and sensors display.
Why convert bar to PSIG?
Bar and PSIG are two of the most common pressure units used globally. The bar is part of the metric system and is widely used in Europe, Asia, and many industrial applications worldwide. PSIG (pounds per square inch gauge) is the standard pressure unit in the United States for tire pressure, HVAC systems, hydraulic equipment, and industrial processes. Converting between these units is essential for international equipment specifications, cross-border projects, and understanding pressure ratings on equipment from different manufacturers.
Regional Notes
India: Both bar and PSIG are used depending on the industry. Automotive tire pressures are commonly specified in PSI (often converted from kg/cm²), while industrial and engineering applications increasingly use bar. Indian HVAC and refrigeration sectors commonly work with both units.
United States: PSIG is the dominant unit for most pressure measurements including tire pressure (typically 30-35 PSIG), HVAC refrigerant pressures, water system pressures, and industrial gauges. Bar is sometimes encountered on imported equipment and scientific instruments.
United Kingdom: Bar is widely used in industrial, automotive, and scientific contexts, though PSIG is still common in older equipment and some specialized fields. Many UK pressure gauges display both bar and PSI scales.
Common applications
- Automotive tire pressure (typically 2.0-2.5 bar / 29-36 PSIG)
- HVAC refrigerant pressure testing
- Hydraulic systems in construction and manufacturing
- Scuba diving tank pressure
- Industrial compressed air systems
- Water pressure in plumbing systems
Frequently Asked Questions
What is the formula to convert bar to PSIG?
The formula to convert bar to PSIG is: PSIG = (bar × 14.5038) - 14.7. First multiply the bar value by 14.5038 to get PSI, then subtract 14.7 (atmospheric pressure at sea level) to obtain gauge pressure.
What is the difference between PSI and PSIG?
PSI (pounds per square inch) measures absolute pressure relative to a perfect vacuum, while PSIG (pounds per square inch gauge) measures pressure relative to atmospheric pressure (14.7 psi at sea level). PSIG = PSI - 14.7. Gauge pressure is what most pressure gauges and tire pressure readings display.
How many PSIG is 1 bar?
1 bar equals approximately 0 PSIG at sea level. This is because 1 bar = 14.5038 PSI, and subtracting atmospheric pressure (14.7 psi) gives roughly 0 PSIG. In practice, 1 bar is very close to standard atmospheric pressure, so its gauge pressure is near zero.
How do I convert 10 bar to PSIG?
To convert 10 bar to PSIG: multiply 10 by 14.5038 to get 145.038 PSI, then subtract 14.7 to get 130.338 PSIG. So 10 bar is approximately 130.34 PSIG.
Can bar to PSIG conversion be used for tire pressure?
Yes, bar to PSIG conversion is commonly used for tire pressure measurements worldwide. Many European and Asian vehicles specify tire pressure in bar, while US vehicles use PSIG. For example, 2.2 bar of tire pressure equals approximately 31.9 PSIG using the formula.
Is bar to PSIG conversion accurate for all altitudes?
The standard formula subtracts 14.7 psi for sea-level atmospheric pressure. At higher altitudes, atmospheric pressure is lower, so the actual PSIG reading would be slightly higher than the formula calculates. For most practical applications at typical elevations, the sea-level formula provides sufficient accuracy.
What industries use bar to PSIG conversion?
Bar to PSIG conversion is widely used in HVAC (refrigerant pressure testing), automotive (tire pressure and turbo boost), industrial manufacturing (hydraulic systems), petroleum engineering (pipeline pressure), scuba diving (tank pressure), and food processing (sterilization equipment).
How does the Bar To PSIG Conversion calculator work?
Enter your pressure value in bars and click Convert. The calculator automatically applies the formula PSIG = (bar × 14.5038) - 14.7 to give you the equivalent gauge pressure in PSIG. Results are displayed with up to 4 decimal places and can be shared via URL.