Free HVAC Refrigerant Calculators
Interactive tools built for working technicians pressure/temperature lookups, superheat and subcooling, recovery sizing, and load calculations, all in one place.
- Covers All 8 Refrigerants
- Built for Field Use
- No Login Required
- Updated for Current A2L Data
All Calculators
Each tool embeds directly into the relevant refrigerant guide, or use it here standalone.
How These Tools Work
Live, Editable Inputs
Comparing Honeywell's Genetron R‑32 to the incumbent R‑410A standard.
Field‑Checked Data
Pressure/temperature values are cross‑checked against manufacturer PT charts for all 8 refrigerants.
Built Into Every Guide
Calculators embed directly inside the matching refrigerant's charging and recovery articles.
Getting the Most Out of These Calculators
Each tool is built for the field, not the classroom quick inputs, an instant result, and a straight line back to the refrigerant you need.
PT Calculator vs. Pressure Calculator
The PT calculator converts between pressure and temperature for a chosen refrigerant, useful for confirming a gauge reading against expected saturation temperature. The pressure calculator instead estimates expected system pressure directly from ambient temperature, which is faster for a quick diagnostic check before hooking up gauges.
Sizing Tools for New Installs
The BTU and tonnage calculators estimate cooling load from room or building size, while the pipe sizing calculator translates that load into the correct line-set diameter and length. Running all three together before a new install avoids undersized lines that starve the system of refrigerant flow.
Superheat and Subcooling Using Guide
Superheat charging applies to fixed-orifice metering devices, while subcooling is the correct method for systems with a TXV. Using the wrong method on a given system is one of the most common charging mistakes in the field, so confirming metering device type before opening a cylinder saves a callback.
Frequently Asked Questions
Yes. All eight stocked refrigerants, including the newer A2L blends R-32 and R-454B, use pressure/temperature data cross-checked against current manufacturer charts.
No login is required for any calculator on this page every tool is free and open for immediate use.
Superheat charging is used on fixed-orifice metering devices, while subcooling charging applies to systems with a thermostatic expansion valve (TXV). Using the correct method for the metering device is essential for an accurate charge.
Yes. Enter the BTU load and equivalent line length to get a recommended line-set diameter sized for that specific installation.
Need the Refrigerant to Match?
Every calculator links straight to the in‑stock cylinder for that refrigerant.