Refrigerant Line Charge Calculator

Inputs

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Use the equipment manual rate when available. Volume-density is a fallback screen when you know line ID and liquid density.
Actual measured one-way refrigerant line-set length used by the equipment manual.
ft
Line length already covered by the factory charge or chargeless length.
ft
Use the rate from the equipment manual, commonly listed in oz/ft or g/m.
oz/ft
Optional existing charge from the nameplate or manual. Leave zero to calculate added charge only.
oz
Optional manual adjustment such as a branch-kit, coil, suction-line or model correction. Negative values are allowed when the manual subtracts an adjustment.
oz

Results

Default result
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Net additional charge(C_net)
12oz
Pass

Installed length exceeds the factory-included length; added charge is based on the entered rate.

Line-set charge plus any manual adjustment.

Also computed

Total charge with base(B + C_net)Pass12oz

Base charge plus net additional line-set charge.

Only meaningful when the nameplate/factory charge input is filled in.

Length beyond factory charge(L - L0)20ft

Charge rate used(r)0.6oz/ft

Rate source: manufacturer rate.

Line-set charge before adjustment(C_line)12oz

Manual adjustment used(A)0oz

Added liquid-line volume(V_added)18.23in³

Additional refrigerant vs Installed line-set lengthAdded charge stays flat through the included factory-charge length, then increases with line length and the entered charge rate.Additional refrigerant vs Installed line-set length010203040020406080selectedInstalled line-set length (ft)Additional refrigerant (oz)
Added charge stays flat through the included factory-charge length, then increases with line length and the entered charge rate.
Method notes 3 notes
  • Formula: net added charge = max(installed length - factory-included length, 0) * charge rate + manual adjustment.
  • Manufacturer manuals may use model-specific charge rates, line-size tables, branch-kit adders, suction-line adjustments, maximum total charge limits and rounding rules.
  • This calculator estimates charge only. It does not select suction/liquid line size, verify oil return, long-line accessories, evacuation, leak testing, subcooling/superheat or A2L safety requirements.

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