Aisha K.
Mar 12, 2026
Clean layout and the results update instantly. Exactly what I needed for a quick planning check.
HVAC & Climate Control
AC Line Set Refrigerant Charge Calculator
Charge oz ≈ length × oz per foot (by line diameter).
Estimate additional refrigerant for line set length beyond factory charge. Planning estimates only — verify measurements and local codes on site.
Inputs
5100
0.250.75
0.11
Smart analysis
Recommendations
Tailored to your live inputs and result—guidance only, not professional advice.
- Interpret
Treat this as a planning estimate
Primary result: Additional charge = 7.5 oz. Re-run with optimistic and pessimistic inputs to understand the range—not just a single point.
Scenario studio
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Plain-English guide
Terms & how it works
Confused by a field? Read the short definitions here while you use the tool.
Line set length (ft)
The “Line set length (ft)” value used in this tool’s formula. Adjust it to see results update live.
Line diameter (in)
The “Line diameter (in)” value used in this tool’s formula. Adjust it to see results update live.
Oz per foot (refrigerant)
The “Oz per foot (refrigerant)” value used in this tool’s formula. Adjust it to see results update live.
How this calculator works
Estimate additional refrigerant for line set length beyond factory charge. Planning estimates only — verify measurements and local codes on site. Charge oz ≈ length × oz per foot (by line diameter). Example: 25 ft of 3/8 in line set → ~6–8 oz additional R-410A.
Charge oz ≈ length × oz per foot (by line diameter).
Example: 25 ft of 3/8 in line set → ~6–8 oz additional R-410A.
When to use this Refrigerant Charge Estimator
Common use cases
- Estimate additional refrigerant for line set length beyond factory charge.
- Sanity-check with this case: 25 ft of 3/8 in line set → ~6–8 oz additional R-410A.
- The relationship is: Charge oz ≈ length × oz per foot (by line diameter).
Localized examples
- HVAC & Climate Control: the example on this page uses the same formula as the widget.
What you get
- Fields: Line set length (ft), Line diameter (in), Oz per foot (refrigerant)
- Charge oz ≈ length × oz per foot (by line diameter).
- Example on the page: 25 ft of 3/8 in line set → ~6–8 oz additional R-410A.
How to Calculate Refrigerant Charge Estimator Step-by-Step
- 1Enter Line set length (ft), Line diameter (in), Oz per foot (refrigerant). Use the values you have, not a catalog average, unless that is all you know.
- 2Charge oz ≈ length × oz per foot (by line diameter).
- 3Worked case: 25 ft of 3/8 in line set → ~6–8 oz additional R-410A.
- 4Buy materials after you walk the job. This is a first-pass quantity, not a purchase order.
Governing formula
Charge oz ≈ length × oz per foot (by line diameter).
25 ft of 3/8 in line set → ~6–8 oz additional R-410A.
Example: set Line set length (ft) = 25, Line diameter (in) = 0.375, Oz per foot (refrigerant) = 0.3, then read the result.
Variable definitions
- lineLengthFt
Line set length (ft)
The “Line set length (ft)” field. Default 25; typical range 5–100.
- lineDiameterIn
Line diameter (in)
The “Line diameter (in)” field. Default 0.375; typical range 0.25–0.75.
- ozPerFoot
Oz per foot (refrigerant)
The “Oz per foot (refrigerant)” field. Default 0.3; typical range 0.1–1.
- The takeoff (Charge oz ≈ length × oz per foot (by line diameter).) ignores waste, code, and what you find when you open the wall. Measure twice on site.
- Nothing here is uploaded for the calculation itself.
Frequently Asked Questions
Charge oz ≈ length × oz per foot (by line diameter).
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Community
Reviews & Ratings
See what others think about this tool, then leave your own rating to help improve CalculioHub.
4.8
out of 5.0
4 reviews
Daniel R.
Feb 28, 2026
Very usable on mobile. Would love a save/export option later, but the math feels solid.
Priya S.
Feb 3, 2026
The FAQ section answered my questions before I even had to search. Smooth dark mode too.
Marcus L.
Jan 19, 2026
Simple inputs, clear outputs. This replaced three bookmarks I used to juggle.
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