Bathroom materials calculator

Estimate outputs: Floor tile boxes, Wall tile boxes, Waterproofing material, Tile adhesive. Adjust Length, Width, Tiled wall height 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
Length	3 m
Width	2.4 m
Tiled wall height	2.4 m
Openings area	1.9 m²
Floor tile coverage per box	1.44 m²
Wall tile coverage per box	1.2 m²
Waterproofing consumption	1.5 kg/m²
Tile adhesive consumption	4.5 kg/m²
Waste allowance	12 %

Formula and assumptions

Floor tile boxes
ceil((Length × Width × (1 + Waste allowance / 100)) / Floor tile coverage per box)

Wall tile boxes
ceil(max(0, 2 × (Length + Width) × Tiled wall height - Openings area) × (1 + Waste allowance / 100) / Wall tile coverage per box)

Waterproofing material
(Length × Width + max(0, 2 × (Length + Width) × Tiled wall height - Openings area)) × (1 + Waste allowance / 100) × Waterproofing consumption

Tile adhesive
Waterproofing material / Waterproofing consumption × Tile adhesive consumption

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.

Project lists use simplified rectangular geometry. They do not include every fixing, fitting, accessory or labor cost.

Worked example

Sample values are examples, not product specifications. Run the calculation again with your own measurements.

Result	Calculation
Floor tile boxes	6
Wall tile boxes	23
Waterproofing material	52.4496 kg
Tile adhesive	157.3488 kg

Related calculators

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