HVAC Pressure Unit Converter Chart
Accurately convert pressure scales for chillers, refrigeration systems, and manifold gauges between PSI, Bar, kPa, MPa, kg/cm², atm, and inHg instantly.
All Units Equivalent Table
1 PSI =| Unit | Full Name | Equivalent Value |
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HVAC Pressure Unit Converter Chart & Live Conversion Tools
Professional Technical Reference Guide for HVAC & Refrigeration Engineers
Welcome to the ultimate HVAC pressure unit converter chart and interactive conversion tool designed specifically for HVAC technicians, refrigeration engineers, and vocational students. Whether you are servicing a centrifugal chiller, setting up control panel settings, charging refrigerant, or reading a manifold gauge, converting pressure values between PSI, Bar, kPa, MPa, kg/cm², atm, and inHg is essential for accurate troubleshooting.
Use our live chiller pressure converter tool above to calculate instant conversions, explore our interactive JCI Classes Main Page for complete technician courses, or refer to the reference guides below.
Common Pressure Units in HVAC & Refrigeration Systems
In the HVAC and refrigeration industry, equipment manuals, analog gauges, digital manifolds, and Building Management Systems (BMS) utilize different pressure scales:
- PSI (Pounds per Square Inch): Standard pressure measurement widely used on manifold gauges, residential direct expansion (DX) units, and split air conditioning systems.
- Bar & kPa / MPa: Standard SI units commonly featured on European equipment, commercial scroll/screw chillers, Variable Refrigerant Flow (VRF) systems, and digital sensors.
- kg/cm² (Kilogram-force per sq. cm): Frequently found in older industrial reciprocating compressor technical data sheets and high-side pressure ratings.
- inHg (Inches of Mercury): The standard measurement unit used for system evacuation and checking deep vacuum levels before gas charging.
Standard Pressure Conversion Formulas for Refrigeration
If you need to perform manual calculations or verify field readings, here is the complete reference breakdown for bar to psi conversion formula for refrigeration and other core units:
- PSI to kPa Conversion: Multiply PSI by 6.89476 (PSI × 6.89476 = kPa)
- Bar to PSI Conversion: Multiply Bar by 14.5038 (Bar × 14.5038 = PSI)
- 1 Bar Equivalents: 1 Bar = 100 kPa = 0.1 MPa | 1 Bar ≈ 14.5038 PSI | 1 Bar ≈ 1.0197 kg/cm² | 1 Bar ≈ 0.9869 atm
- Vacuum Conversion: 1 inHg ≈ 3.386 kPa
Frequently Asked Questions (FAQ)
To perform a quick psi to kpa conversion for hvac, multiply your PSI reading by 6.895. For example, a standing pressure of 100 PSI equals approximately 689.5 kPa. Alternatively, enter the value directly into our interactive converter tool above for instant calculations across all units.
Standard atmospheric pressure at sea level equals 1 atm, which translates to:
- 14.696 PSI
- 1.01325 Bar
- 101.325 kPa
Vacuum pressure measures levels below atmospheric pressure. Measuring deep vacuum in inches of mercury (inHg) or microns provides the fine precision needed to ensure non-condensable gases and moisture are completely evacuated from the refrigeration circuit before charging gas. For more online tools, visit our HVAC Tools & Utilities Directory.