Free HVAC&R Engineering Calculators
Every calculator here runs on the same thermodynamic engine used across the platform — real refrigerant property data (CoolProp), not lookup tables or approximations. Free plan: 20 calculations per month. No card, no install.
Cycle & efficiency
COP, superheat, subcooling, P-h diagrams, cascade — real thermodynamic state points for the refrigerants you actually service.
Refrigerant COP Calculator
Compute coefficient of performance for any operating point: R410A, R134a, R32, R404A, R290, R744. Real thermodynamic cycle engine, free to use.
Open calculator →Superheat & Subcooling Calculator
Calculate superheat and subcooling effects on refrigeration cycle performance with real thermodynamic data. Free calculator for R410A, R134a, R32, R404A, R290, R744. No install.
Open calculator →P-H Diagram Calculator
Explore a live pressure-enthalpy (P-h) diagram for your refrigeration cycle — the saturation dome, the four state points, and how superheat, subcooling and evaporating temperature shift the loop, with real CoolProp data. Free, no install.
Open calculator →Cascade Refrigeration Cycle Calculator
Design and analyze cascade refrigeration cycles: high-stage R134a/R410A with low-stage CO2 or R23. Real two-stage thermodynamic engine, free calculator.
Open calculator →Refrigerant data
Saturation charts and side-by-side comparison for drop-in decisions and charging checks.
Refrigerant Pressure-Temperature Chart
Saturation pressure-temperature chart for common refrigerants: R410A, R134a, R32, R404A, R290, R744. Real CoolProp data from −40°C to +70°C. Free reference chart.
Open calculator →Refrigerant Comparison Calculator
Compare refrigerants side by side at the same operating point: COP, capacity, discharge temperature, GWP, phaseout status. Free comparison tool for drop-in decisions.
Open calculator →Field sizing
Lines and compressors — the numbers that decide whether a job runs or fails on site.
Refrigeration Pipe Sizing Calculator
Size refrigeration suction, discharge and liquid lines with pressure drop and oil-return velocity checks. Free engineering tool for HVAC&R contractors.
Open calculator →Compressor Selection Calculator
Select a compressor with AHRI 10-coefficient performance curves or import your own manufacturer map as CSV. Capacity, power and efficiency at your exact operating point — free tool.
Open calculator →Beyond free calculators
Pro unlocks the full suite: interactive P-h diagrams, cascade cycles, refrigerant comparison, PDF engineering reports, AI troubleshooting and unlimited calculations.
Start free — no card required