How the backsplash tile calculator works
A backsplash is a short, wide wall area. The calculator multiplies width by height, divides by the area of one tile, adds a cut allowance, and rounds up.
Subway and mosaic sizes mean many tiles per square foot, so the scale drawing helps show how many rows and cuts to expect.
Formula and assumptions
- tile w, tile h
- tile size in inches
- waste
- cut allowance for outlets, corners, and cabinet ends
Assumptions and limits
- Does not subtract outlets or switch plates; cuts around them consume tiles anyway.
- Mosaic sheets: use the sheet size as the tile size.
Worked example
An 8 ft long, 18 in (1.5 ft) high backsplash with 3 × 6 in subway tile and 15% waste.
- Area = 8 × 1.5 = 12 sq ft.
- Each tile = 18 sq in = 0.125 sq ft; 12 ÷ 0.125 = 96 tiles.
- 96 × 1.15 = 110.4; round up to 111 tiles.
These are the calculator’s default values, so the live result above matches this example until you change an input.
How to measure correctly
- Measure each run of counter separately and add them.
- Measure height from the countertop to the cabinet underside, or to where the tile will stop.
- Include the area behind a range if it will be tiled to a hood.
Backsplash Tile Calculator FAQ
How much tile do I need for a backsplash?
Multiply the length by the height to get square feet, add 10–15% or more for cuts, and divide by your tile size. An 8 × 1.5 ft backsplash with 3 × 6 in tile is 96 tiles before waste.
Why use more waste on a backsplash than a floor?
Outlets, window returns, cabinet ends, and inside corners create many small cuts relative to the area.
How many 3×6 subway tiles are in a square foot?
Eight. Each 3 × 6 in tile is 18 sq in, and a square foot is 144 sq in.
How do I calculate mosaic sheets?
Enter the sheet size (often around 12 × 12 in) as the tile size and the result becomes a sheet count.
Do I tile behind the stove?
Many designs do, often up to the hood. Measure that panel separately and add it.