Refrigerant Charge Calculator

Refrigerant Charge Calculator is built by HVAC technicians for HVAC technicians to calculate additional refrigerant charge requirements. Calculate additional refrigerant charge requirements for copper line sets based on liquid and suction line length and diameter — supporting 20 refrigerants including R-410A, R-454B (next-gen replacement), R-32 mini-splits, and EPA 608 refrigeration blends.

FEATURES:
Calculate Additional Refrigerant Charge — For copper line sets of any length
20 Refrigerants Supported — R-410A, R-22, R-454B, R-32, R-407C, R-134a, R-404A, R-507A, R-290, R-717, R-12, R-502, R-1234yf, R-448A, R-449A, R-513A, R-744, R-600a, R-407A, R-422D
Liquid Line Diameters — 9 sizes from 1/4" to 1-1/8", including 5/16" mini-split
Suction Line Diameters — 3/8" to 2-5/8" standard copper sizes
Results in Multiple Units — Ounces (oz), pounds (lbs), and grams (g)
Industry-Standard Data — aligned with OEM long-line guides (Goodman, Carrier)
Warnings for Long Line Sets — Alerts when unusual refrigerant quantities are needed

100% OFFLINE OPERATION:
Works without internet connection. All refrigerant charge data built into the app — no server calls, no delays, no data leakage. Perfect for job sites without cellular coverage.

HOW IT WORKS:
1. Select your refrigerant type (R-410A, R-454B, R-32, etc.)
2. Enter liquid line length (feet) and diameter (inches)
3. Enter suction line length (feet) and diameter (inches)
4. Get instant charge calculation in oz, lbs, and grams

WHY YOU NEED THIS CALCULATOR:
When installing split systems, mini-splits, or equipment with long line sets, the factory charge only covers standard line length (typically 25 ft). Every extra foot of copper tubing requires additional refrigerant. This calculator provides exact amount based on industry charge-per-foot tables — preventing system undercharge that destroys compressors.

SUPPORTED REFRIGERANTS:
R-410A — Residential AC & heat pumps (most common 2026)
R-22 — Legacy systems still in service (phaseout complete 2030)
R-454B — Next-generation R-410A replacement (EPA mandate 2025+)
R-32 — Mini-split & VRF systems (lowest GWP option)
R-407C — Commercial AC applications
R-134a — Auto AC & water chiller systems
R-404A — Commercial refrigeration freezers
R-507A — Low-temperature refrigeration systems
R-290 — Propane systems (hydrocarbon alternative)
R-717 — Ammonia industrial refrigeration

OPTIONAL PRO UPGRADE — $2.99 ONE-TIME IN-APP PURCHASE
The following features require a separate one-time in-app purchase. They are not required to use the calculator:
• Unlimited saved calculation history
• PDF export of results
• Dark theme
• Ad-free experience

ACCURACY STANDARDS:
Charge-per-foot values computed from NIST REFPROP-grade refrigerant densities (liquid line at 70°F, suction vapor at 40°F saturation) and aligned with manufacturer long-line guides (Goodman, Carrier). Covers both liquid and suction line contributions. Always follow your unit's installation manual when it specifies a different per-foot value.

PERFECT FOR:
HVAC technicians installing split systems and heat pumps
Mini-split installers designing ductless systems
Refrigeration mechanics sizing refrigerant lines
AC contractors bidding and executing long line set jobs
HVAC students and apprentices learning charge calculations
Building maintenance engineers commissioning new equipment
Equipment commissioning specialists verifying correct charges
Service technicians replacing line sets on existing systems

Accurate refrigerant charge calculations prevent undercharge, overcharge, and system failure on every installation and service call.

Part of HVACTools Suite — professional HVAC technician and refrigeration calculator app collection for field diagnostics and system commissioning.

Recent changes:
Added 10 refrigerants: R-12, R-502, R-1234yf, R-448A, R-449A, R-513A, R-744 (CO2), R-600a, R-407A, R-422D — now 20. Charge per foot from NIST REFPROP-grade liquid and vapor densities.