Calculator Inputs
Add one or more areas, then calculate totals.
Formula Used
Area A = L × W (converted to meters)
Volume V(L) = A(m²) × Depth(mm) because 1 mm × 1 m² = 1 liter
Compound (base) Kg_base = A × Depth × Rate, where Rate is kg per m² per mm
Waste Kg_total = Kg_base × (1 + Waste%/100)
Bags Bags = ceil(Kg_total / BagKg)
Water Water(L) = Kg_total × (L per kg)
Adjust rate, bag weight, and water to match your product label.
How to Use This Calculator
- Measure each uneven zone and add it as a section.
- Estimate average depth using a straightedge and shims.
- Confirm your product’s coverage rate and bag weight.
- Set a waste allowance for mixing and surface porosity.
- Press Calculate to see totals above the form.
- Download CSV or PDF from the results panel.
Example Data Table
| Example Section | Length | Width | Depth | Area (m²) | Compound (kg) |
|---|---|---|---|---|---|
| Garden Shed | 3.0 m | 2.0 m | 5 mm | 6.00 | 48.00 |
| Patio Corner | 2.5 m | 1.6 m | 3 mm | 4.00 | 19.20 |
| Walkway Patch | 1.8 m | 1.2 m | 8 mm | 2.16 | 27.65 |
| Assumptions | Rate 1.6 kg/m²/mm, before waste and rounding. | ||||
Example figures demonstrate how sections roll up into totals.