Radiator BTU Calculator
Estimate room heat requirement in BTU using room dimensions and a simple heat-load factor.
Results - Radiator BTU Calculator
Enter your measurements and press calculate.
BTU estimate notes
This is a quick sizing guide based on room volume and a standard domestic heat factor. It is useful for early-stage product selection, not final heating design.
Popular sizes
Popular pre-filled calculator pages.
Pre-filled calculator pages help visitors jump straight to a useful estimate and then refine the result if needed.