Grout calculator
Estimate outputs: Material mass, Bags. Adjust Heated floor area, Tile length, Tile width to match your project.
Estimate outputs: Material mass, Bags. Adjust Heated floor area, Tile length, Tile width to match your project.
Inputs and units
Use the units shown beside each field. Replace the sample values with your measurements and the figures on the selected product packaging.
| Parameter | Example input |
|---|---|
| Heated floor area | 12 m² |
| Tile length | 60 cm |
| Tile width | 30 cm |
| Joint thickness | 3 mm |
| Layer thickness | 8 mm |
| Material density | 1.6 kg/l |
| Bag weight | 2 kg |
| Waste allowance | 10 % |
Formula and assumptions
Material mass(Tile length × 10 + Tile width × 10) / (Tile length × 10 × Tile width × 10) × Joint thickness × Layer thickness × Material density × Heated floor area × (1 + Waste allowance / 100)
Bagsceil(Material mass / Bag weight)
ceil = round up; floor = round down; max = the greater value. Trigonometric angles are converted from degrees to radians.
Allowance is applied before rounding to whole packages. Whole units are rounded up; displayed decimals are rounded only for readability.
Coverage depends on the product, substrate and installation method. Enter the supplier’s consumption figures; an area estimate cannot replace a cutting layout.
Worked example
Sample values are examples, not product specifications. Run the calculation again with your own measurements.
| Result | Calculation |
|---|---|
| Material mass | 2.5344 kg |
| Bags | 2 |
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