Heating power estimate
Enter your values to see the result, check the formula and copy your calculation.
Enter your values, then calculate.
Your calculation stays in your browser.
The formula, explained
area*height*factorarea : Floor area (m²)height : Ceiling height (m)factor : Assumed heat demand (W/m³)Your assumptions determine the result. Check your data and compare scenarios; this calculation is not a quote or a live tariff.
An example to check
Using the starting values below, the calculation gives:
An initial estimate of heating power — The heated volume is 50 m³. At 40 W/m³, estimated power is 2,000 W.
This factor simplifies heat loss. Before choosing equipment, have insulation, climate, windows and target temperature checked: this calculation alone does not size an installation.
How to use this tool
Check the required inputs: floor area (m²), ceiling height (m), assumed heat demand (w/m³).
Choose the units and options that match your task. Calculate, check the result and use Copy or Print to keep a record. Rounding applies to the display; keep more precision in intermediate steps.
Can I use a decimal comma?
Yes. Numeric fields accept 12.5 or 12,5 and spaces for thousands, such as 1 234.50. Do not mix a point and comma in one number.
Where are my inputs processed?
Calculations run in your browser. Form values are not sent to Analytics. Copying, printing, sharing or opening an external service is your choice.
Method and interface checked on 2026-09-19 · Report an error