Calculators Here are a couple helpful calculators that you can download and use with your next project: System Volume Calculator Calculate the volume of your pipe system by enterring pipe diameters and lengths Thermal Energy Calculator Calculate the thermal energy, volume, or change in liquid temperature Temperature Converter Convert between Celsius and Fahrenheit Units. Pex Tubing Calculator Calculate the amount of Pex required for your project. Pressure Converter Convert between pressure units (KPa, Foot of Head, bar, psi, inHg). Flow Rate Converter Convert between volume units (LPM, LPS, GPM)