Refrigerant Line Charge Calculator
Estimate the extra R-410A or R-22 a split system needs for its line set length and sizes.
Change the values and press Calculate to work out your own figures.
Enter the line length, sizes and the length the unit already covers.
Show the working
- charge = (line length − precharged length) × oz per foot
How to use it
Enter the line length, sizes and the length the unit already covers.
Lengths can be decimals, fractions or tape entries such as 12' 6 1/2" (in feet or inches). Prices are optional.
Key facts
charge = (line length − precharged length) × (liquid oz/ft + suction oz/ft)
Charging
Weigh in the charge, then check superheat or subcooling as the manufacturer specifies. Handling refrigerant requires EPA Section 608 certification in the US.
Questions
How much R-410A for 50 ft of 3/8 in liquid line?
25.5 oz (1.59 lb) before taking off the precharged length.
Formulas
charge = (line length − precharged length) × (liquid oz/ft + suction oz/ft)
Sources
Limitations
- Material densities are typical values (the midpoint of the commonly published range); real loads vary with moisture, grading and compaction, so check with your supplier or type in their density.
- Tank results are the geometric volume; real tanks have wall thickness and fittings.