Engineering tool

Refrigerant Pipe Sizer

Look up suction and liquid line sizes for R22, R134A and R404A/R507 from the manufacturer line-sizing tables.

Line conditions

Units

Refrigerant

Equivalent length (m or ft)

Capacity (kW or BTU/h)

Evaporating temperature (°C or °F)

Enter the line conditions to look up the suction and liquid line sizes.

Sizes come straight from the manufacturer line-sizing tables. The lookup is done in imperial units, so metric inputs are converted first.
When the exact length, capacity or temperature is not tabulated, the table picks the next size up rather than interpolating.
Equivalent length must include the allowance for fittings, bends and valves, not just the straight run of pipe.
Check oil return on risers and confirm the selection against the compressor manufacturer's data before ordering.