Tile and Grout Coverage Calculator
Calculate the number of tiles required and the amount of grout needed for your floor or wall tiling project, including waste allowance.
Formulas Used
1. Room Area
A = Room Length (ft) × Room Width (ft)
2. Tiles Required
Tilesbase = A / (Tile Length (ft) × Tile Width (ft))
Tilestotal = ⌈ Tilesbase × (1 + Waste%) ⌉
3. Grout Weight (TCNA / Laticrete Industry Formula)
Wgrout = [(L + W) / (L × W)] × J × T × D × Ain²
Where:
L = Tile length (in)
W = Tile width (in)
J = Grout joint width (in)
T = Tile thickness (in)
D = Grout density (lb/in³) = stated density (lb/ft³) ÷ 1728
Ain² = Total area in square inches
The factor (L + W) / (L × W) gives the total joint length per unit tile face area (in⁻¹),
representing the perimeter-to-area ratio of a single tile.
4. Grout with Waste
Wtotal = Wgrout × (1 + Waste%)
Assumptions & References
- The grout formula follows the Tile Council of North America (TCNA) Handbook and Laticrete grout coverage guidelines.
- Grout density defaults: unsanded grout ≈ 100 lb/ft³; sanded grout ≈ 110 lb/ft³ (manufacturer data sheets).
- A 10% waste allowance is the industry standard for straight-lay patterns; diagonal or complex patterns may require 15–20%.
- The formula assumes full grout joint depth equal to tile thickness; actual depth may vary with setting-bed type.
- Room area is treated as a simple rectangle. Subtract any fixed obstacles (cabinets, islands) manually.
- Grout bag counts are rounded up to the nearest whole bag to ensure you do not run short.
- 1 ft² = 144 in²; 1 ft³ = 1728 in³; 1 lb = 0.453592 kg.
- This calculator does not account for tile adhesive / thinset mortar — use a separate mortar coverage calculator for that.