Heat power calculator

Thermal energy calculator

online since 2006

Calculator start selection

Read all about available deployments. In any way of utilizing calculator, Internet connection is not required, but nice to have for authentication at least.

Available in download version

save/open multiple results
export to word and excel
print results
common and custom fluid properties
K factor for fittings, resistance coefficient
pipe surface roughness selection
pipe material selection
select between gauge and absolute pressure
compressible isothermal flow
dry air isothermal flow
gas offtake flow
natural gas flow


Administrator role not needed to install calculator

pipe network analysis

When is this calculator suitable?

This calculator is very easy to use and also very handy at the same time. You can resolve basic heat power requirement tasks in a few seconds.

You can use the calculator for hot water boilers, water and air heat exchangers, hot water radiators, water chillers, air heaters, and other heat power generation and consumption units.

What has to be known for a calculation?

You can select between two calculation scenarios. The first is heat power calculation, and the other one is the flow rate calculation.

In both scenarios, you have to insert the specific heat of a fluid as well as temperatures on the start and the end of the heat exchanger.

You can also select between volume and mass flow rate, for a known density of the fluid. The calculator displays the velocity of the fluid for entered pipe internal diameter.

Need a helping hand?


If you need a quick calculation, but you are not still familiar how to use the calculator, you can order calculation service from the calculator developer.