Radiator BTU Room Calculator

How to use our radiator calculator

Follow the steps below to find your correct radiator size:

1. Measure the width, length, and height of your room.
2. Identify the type of room (e.g. kitchen, bedroom, or bathroom).
3. Input your measurements into the radiator size BTU calculator.
4. Take a look at your results - the calculator will provide the required BTUs.
5. Use the results to browse our range of radiators and select the ideal size and style for your space.

What are BTUs and why are they important?

Our radiator size calculator will give you an answer in BTUs and you may be wondering exactly what they are. BTUs, or British Thermal Units, measure the heat output of a radiator. The higher the BTU rating, the more heat the radiator will put out. This means that if you have a large room or space that gets particularly chilly, you'll want a radiator with a high BTU rating to keep it warm. For example, if you have a 200 square foot room, you would need a radiator with a BTU rating of around 4,000.

It’s worth noting, however, that there are many other factors besides room size that can affect how many BTUs you need, such as insulator, room usage and what type of windows you have. Our radiator output calculator does account for this by including room type in the BTU calculation but it’s a good idea to consider anything that might cause further heat loss.

Once you know your BTU requirements, you can explore our wide range of radiators designed to match your heating needs. Our radiator size calculator helps you make informed decisions, so you can save energy, reduce heating bills and stay warm all year round.

Order your new radiator today

At Nationwide Supplies, we’re competitive with price without ever compromising on quality, meaning you can get your hands on the radiator you need at an attractive price. We also have quick delivery options available across the UK. Use our radiator BTU calculator to find your perfect size radiator and make an order with us today.