Calculator
Formula Used
Layer method
- Area = L × W if area is not provided
- Mass = Σ(Area × thickness × density)
- Dead load W = (Mass × g) / 1000 in kN
Pressure and direct methods
- W = q × Area where q is kN/m²
- Mass = (W × 1000) / g
- Adjusted = value × (1 + contingency/100)
Dead load is the permanent weight of materials and fixed equipment.
How to Use This Calculator
- Select the method that matches your available data.
- Enter area directly, or provide length and width.
- For layered method, enter thickness and density per layer.
- Optionally add contingency and pricing for quick takeoff.
- Press calculate to show results above this form.
- Download CSV or PDF to store project documentation.
Example Data Table
| Scenario | Area (m²) | Layers | Mass (kg) | g (m/s²) | Contingency | Dead load (kN) | Area load (kN/m²) |
|---|---|---|---|---|---|---|---|
| Slab only | 100 | Concrete 0.15 m @ 2400 | 36000 | 9.80665 | 0% | 353.04 | 3.53 |
| Slab + screed | 80 | 0.12 m @ 2400 + 0.05 m @ 2000 | 31040 | 9.80665 | 5% | 319.70 | 4.00 |
| Direct area load | 120 | q = 3.8 kN/m² | — | 9.80665 | 2% | 465.12 | 3.88 |
Example values are illustrative and may differ from project specifications.
Track permanent loads carefully to support safer designs.