Radiator and Section Quantity Calculator
Calculate required nominal heating output and radiator or section count using room heat loss and correction factor.
Formula
Planning estimate. Check product specifications and local requirements before purchasing.
Worked example: Radiator Output Calculator
Measurements in this example
| Room design heat loss | 3200 W |
|---|---|
| Output per radiator or section | 160 W |
| Output correction factor | 0.85 |
Calculated quantities
| Required nominal output | 3.76 kW |
|---|---|
| Radiators or sections | 24 |
What to check
This calculation uses: Room design heat loss, Output per radiator or section, Output correction factor. It returns: Required nominal output, Radiators or sections.
Published radiator output normally assumes a stated water and room temperature regime. Apply the appropriate manufacturer correction.
This simplified estimate is useful for planning. A room-by-room fabric and ventilation calculation is needed for final system design.
Use the units beside each field. The values in the worked example are starting inputs; replace them with your measurements and the specifications of your material.
Compare alternatives
Open a tool, enter your measured dimensions, then save an estimate. Keep another version if you want to compare products or allowances.