Bar to PSIG Converter
Convert bar to PSIG (pounds per square inch gauge) for industrial pressure readings. Corrects for atmospheric pressure to give accurate gauge measurements.
What is the difference between PSIG and PSIA?
PSIG (pounds per square inch gauge) measures pressure relative to atmospheric pressure. PSIA (pounds per square inch absolute) measures pressure relative to a perfect vacuum. The difference is 14.7 PSI (standard atmospheric pressure at sea level). Formula: PSIA = PSIG + 14.7. Conversely: PSIG = PSIA - 14.7. Most tire gauges, pressure regulators, and industrial gauges measure in PSIG, meaning they read 0 at normal atmospheric pressure.
How do I convert bar to PSIG?
To convert bar to PSIG: First convert bar to PSIA (bar × 14.5038), then subtract 14.7 to get gauge pressure. Formula: PSIG = (bar × 14.5038) - 14.7. Example: 2 bar = (2 × 14.5038) - 14.7 = 14.31 PSIG. For reverse: bar = (PSIG + 14.7) ÷ 14.5038. Example: 30 PSIG = (30 + 14.7) ÷ 14.5038 = 3.08 bar. This calculation is essential when reading European pressure specs with US gauge equipment.
Why would I need to convert bar to PSIG instead of bar to PSI?
Bar to PSIG conversion is needed when working with gauge-based pressure readings. Bar is an absolute unit (0 bar = vacuum), while PSIG is referenced to atmospheric pressure. When your pressure gauge reads in PSIG but specifications are in bar, you must subtract atmospheric pressure. Common applications: hydraulic systems rated in bar but monitored with PSIG gauges, industrial compressors with European specs, and automotive service equipment. If a spec says "system pressure 100 bar", the gauge reading in PSIG would show around 1435 PSIG, not 1450 PSI absolute.
What are common bar to PSIG conversions in industrial settings?
Common industrial bar to PSIG reference values: 1 bar = 0 PSIG (roughly atmospheric). 2 bar = 14.3 PSIG. 3 bar = 28.8 PSIG. 5 bar = 57.8 PSIG. 7 bar = 86.8 PSIG (common compressed air). 10 bar = 130.3 PSIG. 50 bar = 710.5 PSIG. 100 bar = 1436 PSIG (hydraulic systems). 200 bar = 2886 PSIG (high-pressure hydraulics). 350 bar = 5061 PSIG (industrial waterjet cutting). Most pneumatic tools operate at 6-7 bar (87-102 PSIG). Hydraulic systems commonly run at 100-250 bar (1436-3611 PSIG).