Use the Wall Tile Calculator
This calculator estimates wall tile for a rectangular room where all four walls are tiled to the same height. Enter the room length and width, tiled wall height, total area of large doors and windows, tile dimensions, tiles per box and a waste allowance.
The result shows the total wall area, net tiled area, area including waste, estimated number of individual tiles and the number of full boxes required. It is designed as a quick quantity tool rather than a complete tile layout planner.
- Calculates the wall area from room perimeter and tiled height
- Subtracts the entered area of large doors and windows
- Applies your selected waste allowance
- Calculates the estimated number of individual tiles
- Rounds the purchase quantity up to full boxes
- Supports metric and imperial room measurements
Inputs used by this calculator
Use the actual height that will be tiled rather than the full ceiling height when the tile stops partway up the wall. Enter the combined area of large doors and windows that will remain untiled, and check the tile size and tiles-per-box quantity on the product packaging.
Wall tile calculator inputs
| Input | What to enter | Used for |
|---|---|---|
| Room length | Inside length of the rectangular room | Room perimeter |
| Room width | Inside width of the rectangular room | Room perimeter |
| Wall height | Height of the section that will actually be tiled | Gross wall area |
| Doors and windows area | Combined area of large untiled openings | Net wall area |
| Tile length and width | Dimensions of one tile | Individual tile quantity |
| Tiles per box | Number of tiles supplied in one box | Full box quantity |
| Waste allowance | Extra percentage selected for cutting and breakage | Adjusted purchase quantity |
This calculator assumes four walls forming one rectangular room and one consistent tile height. It does not directly calculate a single wall, kitchen backsplash, shower enclosure, niche or several walls with different tile heights.
How this calculator computes tiles and boxes
The calculator finds the room perimeter, multiplies it by the tiled wall height, subtracts the entered openings, adds the selected waste percentage and divides the adjusted area by the area of one tile. The resulting tile count is then converted into full boxes.
The calculator rounds tiles and boxes upward because partial tiles or partial boxes cannot cover the remaining required area. Unused matching tiles can also be kept for future repairs.
Waste allowance input
The calculator does not choose the correct waste allowance automatically. Enter a percentage that reflects your tile layout, cutting complexity and expected breakage. Straight layouts on simple walls generally need less allowance than diagonal layouts, patterned tile, niches or projects with many corners.
Example calculator result
A rectangular room is 12 × 10 ft, the tiled wall height is 8 ft, large openings total 20 sq ft, each tile is 12 × 8 in, there are 12 tiles per box and the waste allowance is 10%. What does the calculation produce?
Answer: The room perimeter is 44 ft and the gross wall area is 352 sq ft. After subtracting 20 sq ft of openings, the net area is 332 sq ft. With 10% waste, the adjusted area is 365.2 sq ft. A 12 × 8 in tile covers about 0.667 sq ft, so approximately 548 tiles are required. At 12 tiles per box, the order rounds up to 46 boxes.
Explanation: This example demonstrates the same sequence used by the calculator: perimeter, wall area, openings, waste, individual tiles and finally full boxes.
How to read the calculator results
Total wall area is the full wall surface before openings are removed. Net wall area is the remaining tiled surface. Area with waste includes the percentage you entered. Tiles needed is the estimated whole-tile quantity, while boxes needed is rounded up from the tiles-per-box value. Confirm the final order against the actual product packaging before purchasing.
Wall Tile Calculator FAQ
What does this calculator assume?
It assumes one rectangular room with four walls tiled to the same height. Large untiled doors and windows are entered as one combined area.
Can it calculate one shower wall or kitchen backsplash directly?
No. The current calculator uses a complete room perimeter, so an individual wall, backsplash, shower enclosure or set of differently sized wall sections should be measured separately. The linked wall tile guide explains how to calculate those layouts.
Why are tiles and boxes rounded up?
A fraction of a tile or box cannot supply the remaining required area. The calculator therefore rounds the tile quantity up first and then rounds the resulting box quantity up to a whole box.
Does this calculator include adhesive or grout?
No. This calculator estimates wall tile and boxes only. Adhesive and grout depend on additional factors such as tile size, trowel notch, substrate, joint width and manufacturer coverage data.