British Thermal Unit (BTU) Heating Calculator - Just Radiators

BTU Calculator

What is a BTU Calculator?

Our BTU (British Thermal Units) calculator accurately works out the heat energy required for your room, per hour – so you can ensure that each room stays at a comfortable temperature, without wasting energy, or money.

How to choose the right radiator?

Before selecting your radiator, you need to know what the heat output requirements of the room are. Not sure what they are? Don’t panic.

We have a simple BTU calculator to help you!

All you need is the room dimentions and the number and type of windows you have.

The calculator will then tell you what size radiator you need to make the room just the right level of cozy!

How is BTU measured?

A single BTU value is determined by the amount of energy needed to raise 1 pound of water above sea level by 1oF, and is a calculation recognised around the world. By considering the dimensions, the windows and the type of room – this measurement can be used to work out how much energy is required to heat the room to a standard temperature (ranging between 18oc to 23oc).

How to use this BTU Calculator?

Simply answer the questions below, then receive your BTU calculation for the room, and explore our personalised recommendations on the radiators that will suit your requirements.

Remember that you can either combine multiple radiators, or stick to just one, to reach the BTU requirement.

BTU Calculator