Free Refrigerant Charge Calculator
Estimate the additional refrigerant charge needed for an AC system based on line set length beyond the factory charge.
ft
ft
oz/ft
oz
Additional Charge
15.0 oz
Total System Charge111.0 oz
Total Charge6.94 lbs
Additional Charge vs Total Line Set Length
Refrigerant Charge Adjustment
Additional Charge = (Line Length - Factory Length) x oz/ft
AC condensing units ship with a factory refrigerant charge that covers a standard line set (typically 25 ft). For every additional foot of liquid line, extra refrigerant must be added per the manufacturer specifications (often 0.6 oz/ft for R-410A).
Example Calculation
50 ft line set, factory covers 25 ft, R-410A at 0.6 oz/ft, 96 oz factory charge.
- 01Extra length = 50 - 25 = 25 ft
- 02Additional = 25 x 0.6 = 15.0 oz
- 03Total = 96 + 15 = 111 oz = 6.94 lbs
Frequently Asked Questions
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