Tile adhesive Calculator: measuring notes and method
Use the rate for the installation
Tile size alone does not establish consumption. Use the product rate for the selected installation, expressed in kg/m².
Separate adhesive from levelling
If the substrate needs preparation or levelling, estimate that product separately. Additional bedding or back-buttering must be reflected in a suitable consumption rate rather than hidden in an unrelated bag size.
Formula
Mass = (area − excluded area) × product consumption × (1 + waste ÷ 100). Bags are rounded up.
Worked examples in metric and imperial units
Illustrative values match Reset example and stay fixed when you edit the calculator. Both columns describe the same calculation; converted inputs are rounded.
Metric worked example
- Total surface area
- 24 m²
- Openings / excluded area
- 0 m²
- Product consumption
- 4 kg/m²
- Bag size
- 20 kg
- Waste allowance
- 10 %
Material required: 105.6 kg
Imperial worked example
- Total surface area
- 258.3339 ft²
- Openings / excluded area
- 0 ft²
- Product consumption
- 0.8193 lb/ft²
- Bag size
- 44.0925 lb
- Waste allowance
- 10 %
Material required: 232.8081 lb
Follow the calculation
- Net area = 24 − 0 = 24 m².
- Mass = 24 × 4 × 1.1 = 105.6 kg.
- Divide by 20 kg per bag and round up.
Reviewed 19 October 2026. How calculations are checked · Report a correction