Refrigerant line charge calculator

Liquid mass = π × (inside diameter in meters)² ÷ 4 × length × density.

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Line internal diameter (mm)

Line length (meters)

More inputs and assumptions

Liquid density at your conditions (kg/m³)

Answer

…

Liquid mass = π × (inside diameter in meters)² ÷ 4 × length × density.

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Precision and calculation record

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Formula and assumptions

Geometric mass for a completely liquid-filled circular line at your supplied density. This is not a system charging instruction. Refrigerant type, pressure, temperature, vapor fraction, factory charge and manufacturer line-length corrections are not inferred.

Automatic precision shows numbers to 12 significant digits. Thousands separators such as 1,000 are accepted; use a dot for decimals.

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Updated 2026-09-29

Using Refrigerant line charge calculator

Liquid mass = π × (inside diameter in meters)² ÷ 4 × length × density.

Next: Cylinder volume calculator

Next: Mass calculator

A worked example

For line internal diameter (mm) = 8, line length (meters) = 10, liquid density at your conditions (kg/m³) = 1000, liquid mass (kg) = 0.502655.

Before you use the result

Example results for line internal diameter (mm)

These examples use Line length (meters): 10; Liquid density at your conditions (kg/m³): 1000. They are reference calculations, not recommended settings.

Line internal diameter (mm)	Liquid mass (kg)
4	0.125664
8	0.502655
16	2.010619

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ToolOctopus. “Refrigerant line charge calculator.” Updated 2026-09-29. https://tooloctopus.com/refrigerant-line-charge-calculator.

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