Automotive AC Refrigerant Charge & Gauge Pressure Calculator (R134a & R1234yf)
Calculate exact refrigerant charge weight in grams and ounces, and diagnose ideal Low-Side and High-Side manifold gauge pressures (PSI) corresponding to ambient outdoor temperature.
Expected Low-Side Gauge Pressure (PSI)
Calculator Inputs
Expected Low-Side Gauge Pressure (PSI)
Expected High-Side Gauge Pressure (PSI)
Refrigerant Weight in Ounces (oz)
Low-Side Pressure in Bar
Automotive AC Gauge Pressures: Low Side vs High Side (PSI)
Aligned with SAE J639 automotive air conditioning standards and EPA Section 609 mobile HVAC pressure-temperature charts.
This calculator is designed for educational and informational purposes based on publicly declared statutory frameworks. The outputs do not constitute binding financial, tax, or legal advice. We assume no liability for decisions made based on these estimates. Always verify with the relevant official authorities or a certified professional advisor.
Calculation Methodology
Normal Low-Side PSI = 18 + (Ambient Temp °C * 0.55). Normal High-Side PSI = (Ambient Temp °F * 2.3). Overcharging beyond factory grams creates high head pressure and damages the compressor.
Frequently Asked Questions
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