HVAC calculator is a full set of the formulas most commonly used by HVAC professionals. Air movement, temperature drops, and electrical all in one easy tool. Formulas include Sub Cooling, Fahrenheit to Celsius, Celsius to Fahrenheit, Electric Heat Qs, Electric Heat BTUH, Electric Heat CFM, Electric Heat Watts and Ohms conversions include, watts from current and voltage, watts from voltage and resistance, watts from current and resistance, voltage from current and resistance, current from voltage and resistance and resistance from voltage and current.