BTU Calculator

BTU stands for British Thermal Unit. It is approximately the amount of energy needed to heat one pound of water by one degree Fahrenheit. It is extremely important to know the exact BTU of the radiator you require to keep your house warm.

It seems to be an extremely tricky balancing act to work out the exact size of radiator you require to keep your house warm at exactly the right temperature and still make sure you do not over-heat the room and waste too much precious energy.

In order to help you with this situation, please take advantage of our easy-to-use BTU Calculator. The BTU Calculator asks some simple questions about the room where you want to install a radiator. When you click the button "Get Total BTUs", it will tell you the output you need to heat the room properly. Once you know the exact number, click on the link that will take you to the radiator selector

Note: Although every attempt has been made to ensure accuracy, these calculations are for guidance only and TradePlumbing accepts no responsibility for any results provided.

To calculate the BTU's, please enter the details below:


1. Dimensions of the Room in Feet Meters
2. Select the Room Type
  Dining Room / Lounge
  Kitchen / Common Area
3. Additional Factors to be taken into consideration. Does the room have
  North Facing Wall
  French Windows
  Double Glazing
  Now you know the size you need, choose your radiator