Impact Tech Solutions · HSE Calculators
FIRE LOAD
Fire Load Calculator
Calculates total fire load and fire load density (MJ/m²) from combustible material inventory, per the method in EN 1991-1-2 (Eurocode 1, Actions on Structures Exposed to Fire), Annex E.
Combustible Materials
Compartment & Combustion Factor
0 MJ
Total Fire Load
0 MJ/m²
Fire Load Density
Formula Reference
Total Fire Load = Σ (Mass × Calorific Value) × Combustion Factor (m)Fire Load Density (qf) = Total Fire Load ÷ Floor Area [MJ/m²]
Typical Net Calorific Values
| Wood | ~17.5 MJ/kg |
| Paper / Cardboard | ~16.5 MJ/kg |
| Textiles / Fabric | ~20 MJ/kg |
| Plastics (general) | ~35 MJ/kg (varies 17–46 by polymer type) |
| Rubber | ~32 MJ/kg |
| Foam / Polyurethane | ~35 MJ/kg |
| Hydrocarbon liquids | ~44 MJ/kg |
Typical Occupancy Fire Load Density (reference only)
| Office (80% fractile, EN 1991-1-2) | ~511 MJ/m² |
| Dwelling / Residential | ~500–780 MJ/m² |
| Retail / Shop | ~600–1,000 MJ/m² |
| Storage / Warehouse | often > 1,000 MJ/m² — highly variable by stored goods |