This application is a must for any plumber, builder or home DIY enthusiast, in fact anyone who wants to find out what radiator or AC BTU's are required for a particular room size.


Whether you have existing radiators (or Fan Coil Units - FCU) and want to check that they are the correct size or if you are adding a new radiator (FCU) to a room - this is the application for you.


⭐⭐⭐ BTU Calculator Features ⭐⭐⭐

✓ Basic Calculations

✓ Advanced Calculations

✓ Electricity consumption and cost (monthly and annual) for your system

✓ Location based climate data

✓ AC or Heating Calculations for temperature increase/ decrease

✓ Room volume

✓ Room use

✓ Double glazing plastic/ metal/ wooden frame windows

✓ Single glazing metal/ wooden frame windows

✓ Insulated/ uninsulated walls

✓ Room position


The annual simulation of the required system will give you a detailed electricity consumption and cost during winter months.


Choose the right size of heat pump, AC or any other thermal source.


Do not undersize or oversize your system. Make an informed decision and choose the correct design/ power.


Design your new home or check your existing one, and be prepared before you receive any offer from the companies or plumbers.


The simple yet intuitive interface allows you the choice of measurements in feet or meters, Celsius or Fahrenheit degrees.


This calculator has the added benefit of showing you the BTU required and also the kW required.


Thank you for using our app!

Professional tool for heating and cooling sizing - AC/ Heat Pump Calculator