About the Dead Load Calculator
Permanent (dead) load of a floor or roof build-up, per square metre and in total.
Also known as: permanent load, self weight calculator, floor dead load, roof dead load.
How to use this calculator
- Enter concrete slab thickness, screed / topping thickness, floor finishes, ceiling and services and the other fields.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
dead load = Σ (thickness × material density)
Worked example
Using the values pre-filled in the calculator above:
- Concrete slab thickness = 150 mm
- Screed / topping thickness = 50 mm
- Floor finishes = 0.3 kN/m²
- Ceiling and services = 0.25 kN/m²
- Partition allowance = 1 kN/m²
- Floor area = 50 m²
the calculator returns:
- Dead load: 6.25 kN/m²
- Slab self weight: 3.6 kN/m²
- Screed: 1.1 kN/m²
- Total over the area: 312.5 kN