Estimate backsplash tile area, individual tile count, box count, and waste allowance from wall length, backsplash height, openings, tile size, and box coverage. Use this page to compare subway tile, mosaic sheets, and larger format backsplash layouts.
Use final field measurements and round up before ordering materials.
The calculator converts backsplash length and height into square feet, subtracts openings, and adds waste. Tile count is based on the tile face area. Box count is rounded up from order area divided by box coverage.
Example: an 18 ft backsplash at 18 inches high is 27.0 square feet before openings. After 3.0 square feet of skipped area, the net area is 24.0 square feet. With 12% waste, the order area is 26.9 square feet, or 3 boxes at 10 square feet per box.
| Tile type | Typical waste | Planning note |
|---|---|---|
| Subway tile | 10%-12% | Common straight or running bond |
| Mosaic sheets | 10%-15% | Sheet cuts and alignment matter |
| Herringbone | 15%-20% | More angled cuts |
| Large format | 10%-15% | Layout and lippage matter |
Order full boxes from the same dye lot and keep extra tile for future repairs. Include thinset or mastic, grout, spacers, edge trim, caulk, sealer where required, outlet extenders, and surface preparation supplies.
Multiply backsplash length by height, subtract skipped areas, add waste, then divide by tile or box coverage.
Small outlets are usually handled through waste. Subtract only large skipped areas such as windows or open wall sections.
Ten to fifteen percent is common, with more for herringbone, diagonal, or complex patterns.
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