Tile Layout and Waste Calculator

Calculate how many tiles you need for a room, accounting for cuts, breakage, and pattern waste.

Room Length (ft) Room Width (ft)

Tile Length (inches) Tile Width (inches) Grout Joint Width (inches)

Waste Percentage (%) Tile Pattern Tile Cost per Box (optional, $) Tiles per Box (optional)

Room Area: A_room = Room Length × Room Width (ft²)

Tile Area (with grout): A_tile = ((Tile Length + Grout) / 12) × ((Tile Width + Grout) / 12) (ft²)

Base Tiles: N_base = A_room / A_tile

Total Waste Factor: W_total = User Waste % + Pattern Extra %

Tiles Needed: N = ⌈ N_base × (1 + W_total / 100) ⌉

Boxes Needed: B = ⌈ N / Tiles per Box ⌉

Total Cost: Cost = B × Cost per Box

Room is assumed to be a simple rectangle with no cutouts (doors, islands, etc.).
Grout joint is uniform on all four sides of each tile; one joint width is added per tile dimension to avoid double-counting.
Straight/grid layout: 10% waste is a common industry standard minimum (TCNA Handbook).
Diagonal (45°) layouts typically require 15–20% extra due to corner cuts (Tile Council of North America).
Herringbone patterns require 20%+ extra due to the high number of angled cuts.
Waste percentage entered by the user is added on top of the pattern-specific extra.
Boxes are always rounded up to the nearest whole box.
It is recommended to keep one spare box for future repairs (color/dye-lot matching).
This calculator does not account for obstacles, niches, or complex room shapes.

In the network