Refrigerant Line Charge Calculator
Estimate liquid refrigerant mass in a line from length, tube inner diameter, and liquid density. Default 25 ft of 3/8 in OD R-410A tube. Not a charging protocol or EPA procedure.
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How to estimate line charge
- Enter line length in feet.
- Pick standard ACR tube OD size.
- Choose refrigerant for liquid density.
- Read ounces and grams. Confirm with manufacturer data before service. Nothing is uploaded.
Refrigerant line charge
Liquid volume times density
| Length | Line run in feet |
|---|---|
| Tube size | Standard OD with fixed ID map |
| Refrigerant | R-410A default liquid density |
| Output | Ounces and grams liquid hold-up |
| Scope | Line only, not full system volume |
| Approval | Not a charging protocol. |
Line volume
Inner diameter from standard tube map times length gives cylindrical volume. Default 25 ft of 3/8 in OD uses the mapped ID in inches converted to meters.
Liquid density
R-410A liquid density about 1052 kg/m³ in the engine table. Other refrigerants switch density constants.
Not a protocol
Factory charge labels, condenser hold-up, and vapor lines are excluded. Licensed techs follow EPA and OEM procedures.
Related construction
Concrete volume and excavation tools live under construction calculators separately from HVAC charge math.
Limits
Typical liquid density, not operating mixed phase.
The formula runs in this tab. CZNull does not receive the numbers.
Informational only. Not wiring, code, or manufacturer approval. See the disclaimer.