Home Radiator BTU Calculator
Find the ideal radiator size for your room using simple choices — no technical knowledge required!
Your Estimated Heating Requirement
BTU Range
0
BTU/hr
Watts Range
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Watts
✅ Our Recommendation: We recommend choosing radiator(s) with a combined output towards the upper end of this range for maximum comfort on colder days. It's always better to have slightly more heating capacity and adjust the temperature down, rather than struggling to heat your room adequately.
⚠️ Important Notice
This calculator provides estimated values based on typical UK conditions using professional heat loss calculation methods. The ±15% comfort range reflects real-world variations in insulation, draughts, and heat retention.
For accurate heat loss calculations, professional system design, or installations requiring Building Regulations compliance, please consult a qualified heating engineer who can perform detailed calculations following CIBSE standards and UK Building Regulations Part L.