HVAC & Refrigeration Tools
Free calculators and converters for air conditioning, refrigeration and electrical work. Designed for homeowners, contractors and technical buyers.
Sizing & Cost Calculators
Work out the right capacity and running costs before you buy.
BTU Room Calculator
Find the right aircon capacity for your room size, ceiling height, sun exposure and more.
Calculate →Running Cost Calculator
Estimate daily, monthly and yearly electricity costs for any air conditioner.
Calculate →Solar / Inverter Compatibility
Check if your inverter and battery system can safely power your air conditioner.
Calculate →Unit Converters
Quick conversions for technical and trade use.
kW ↔ BTU/h
Convert between kilowatts and BTU per hour.
Convert →Pipe Size (in ↔ mm)
Convert refrigeration pipe sizes between inches and millimetres.
Convert →Temperature (°C / °F / K)
Convert between Celsius, Fahrenheit and Kelvin.
Convert →Pressure (PSI / Bar / kPa)
Convert refrigeration and tyre pressures between units.
Convert →Amps Calculator
Calculate full-load amps from watts, voltage and phase.
Calculate →Need help choosing the right unit?
Our team can advise on the correct capacity, installation and brands for your specific situation.