Radiator search banner image

Radiator Size Calculator

What size radiator
are you looking for?

Choosing the Perfect Radiator Size for Your Space

How to Calculate Radiator Sizes

Selecting the right radiator size for your room is a crucial decision, and our Radiator Size Calculator is here to simplify the process. We understand that determining the appropriate size for your radiators can be challenging, so we’ve crafted a tool to guide you through it effortlessly.

Our Radiator Size Calculator streamlines the process of finding the ideal radiator dimensions. Radiator sizes can vary based on style and type, so it’s essential to check before making a purchase. Whether you’re eyeing electric radiatorsbedroom radiators or kitchen radiators, our calculator ensures you make an informed decision tailored to your home.

View all radiators

How to Calculate Radiator Sizes
How to calculate radiator size for a room

How To Calculate Radiator Sizes

In the UK, radiator sizes are measured in the metric system, requiring measurements in meters (m) or millimetres (mm). To accurately calculate the British Thermal Unit (BTU) output for a room, follow these steps:

  • Measure room height, width, and length.
  • Determine the size of the window area (length x width of the window in m²).
  • Use our BTU calculator for a quick and efficient calculation.

Understanding the impact of window dimensions is crucial, especially considering the heat loss potential. Single-glazed windows, for instance, demand higher BTU to counteract heat loss.

At Stelrad, we offer the UK’s largest range of radiator sizes, ensuring our calculator assists you in making the right choice. Whether opting for standard-size radiators or exploring our range of designer radiators, we help you strike the ideal balance between style, heat output, and size for efficient heating.

What size radiator
are you looking for?

Finding the Right Radiator for You

Our radiators come in various shapes and sizes, serving different functions for various room types. Vertical radiators stand tall, providing a unique aesthetic, while horizontal radiators offer a broader profile for a distinct look. Bathroom radiators, including our towel rail radiators, not only deliver warmth but also serve a practical purpose with their specific shapes and sizes.

For those with limited space, our compact radiators present an ideal solution, tailored to smaller rooms and spaces. If you’re looking for a classic design or a more modern touch from our designer radiators range, your objective is to strike the perfect balance between style, heat output, and size to ensure efficient room heating.

Our commitment to providing a wide range of radiator shapes and sizes ensures that you have the flexibility to choose the one that complements your room’s aesthetics and meets your heating needs. Explore the possibilities, and let our radiators enhance both the warmth and visual appeal of your space.

If you have more questions or need guidance, visit our advice hub today. We’re always ready to assist you in making the right choice for your home.

Single/Flat Panel or Double Panel Radiators
Single/Flat Panel or Double Panel Radiators
These radiators are some of the most commonly used for central heating systems. Central heating radiators are available in two primary configurations: a slim single panel that hugs the wall closely or double panels separated by a gap with convection fins, which enhances their heat output.
Horizontal or Vertical Radiators
Horizontal or Vertical Radiators
Horizontal radiators have a wider width than height and are often positioned beneath windows. Vertical radiators are characterised by their greater height compared to width, making them excellent choices for conserving space. Additionally, due to their heightened visibility, vertical radiators frequently feature a wider array of decorative designs to choose from.
Column Radiators
Column Radiators
Column radiators consist of a vertical alignment of metal tubes connected at both the top and bottom ends. They are available in both horizontal and vertical designs, typically offering a more classic aesthetic compared to flat panel radiators that can add character to a room.
Towel Radiators
Towel Radiators
Towel radiators stand out as the ideal choice for bathroom heating solutions. Consisting of a sequence of horizontally arranged tubes in a ladder-style pattern, they excel at efficiently warming towels. In addition to their practicality, towel radiators also enhance bathroom aesthetics, adding a touch of decorative flair when compared to standard flat panel radiators.
Designer Radiators
Designer Radiators
Designer radiators, frequently referred to as modern or contemporary radiators, present a fusion of functionality and style. These radiators deliver warmth while serving as visually striking focal points in any home. They are available in a variety of formats, including horizontal, vertical, column, and towel radiators, all with stylish designs and an array of diverse finishes to suit your décor.
Space-Saving Radiators
Space-Saving Radiators
Space-saving radiators make the most of compact spaces while simultaneously contributing to the overall room design. You could choose a compact single flat panel radiator that snugly hugs the wall, ensuring it doesn't intrude significantly into the room, or space-efficient vertical radiators that are an excellent choice for areas where furniture or kitchen cabinets must be considered.
FAQs

RADIATOR SIZE CALCULATOR UK

What size radiator do I need?

Open Close

Our Radiator Size Calculator, along with the BTU Calculator, helps determine the dimensions suitable for your space. Ensure an energy-efficient choice by calculating heat output based on your room measurements.

What are standard radiator sizes?

Open Close

At Stelrad, we offer a range of radiator sizes to suit diverse room requirements. “Standard” doesn’t mean one-size; it means a variety of options to match your unique needs. Explore sizes using our Radiator Size Calculator for full details.

Do radiators come in standard sizes?

Open Close

Radiator sizes vary across models. Use our Radiator Size Calculator and BTU calculator to choose dimensions tailored to your room, avoiding a one-size-fits-all approach for optimal energy efficiency.

What is BTU?

Open Close

British Thermal Unit (BTU) measures the heat required to raise the temperature of one pound of water by one degree Fahrenheit. Our BTU calculator simplifies this process, helping you select the right radiator size based on your room’s characteristics.

You still have items in your basket

Would you like to checkout?