Radiator Size Finder
Radiator Size Finder – Choose the Perfect Radiator for Your Space
Welcome to our Radiator Size Finder — your first step towards selecting the right radiator for your room, style and heating needs. At Radiators 4u we understand that size matters: the correct height, width, column count and location can make all the difference in performance and aesthetics.
Using this page you’ll find simple guidance and interactive tools to help you calculate the optimal radiator size. Whether it’s a cosy bedroom, bay window, extension or bathroom, our size‑finder helps you avoid guesswork and oversize or undersize errors.
If you’d rather speak to someone, our expert advisors are ready to guide you through free UK delivery and finish selections.
How Does it Work? - Just tell us the size you need – we’ll find the best match.
Enter the measurements of your existing radiator or the space you want to fill. We’ll search our full range to find the closest fit. If we have the exact size — great! If not, we’ll show you the nearest options along with any adaptors you might need to make it work.
Example Matches:
This radiator exactly matches the space you are looking for. No adaptors are required.
This radiator matches the height perfectly, however it is 40mm too narrow, you can use 2x 20mm adaptors to fill the space perfectly.
This radiator has the closest height match but is not exact. There is a width diffrence of -54mm so we recommend using 2x telescopic adaptors set to 27mm each. Using 2 adaptors allow you centralise your radiator between the valves.