Backsplash Tile Calculator
Enter your measurements
Extra to cover cuts, breakage, and mistakes.
Results
- Tiles needed736 tiles
- Boxes19
- Area80 sq ft
- Thinset (50 lb bags)1
Estimated cost
per sq ft of backsplash tile (material)
Material range runs from basic ceramic and porcelain subway at the low end through premium glass, natural stone, and designer mosaic at the high end, priced per square foot from the box. Installed cost adds professional labor, thinset, grout, and outlet-box extenders; backsplash labor runs higher per square foot than floor tile because of the density of cuts and the precision needed around cabinets and appliances.
Estimate only — prices vary by region, supplier, and season. Get a local quote before buying.
The backsplash tile calculator figures out how many tiles, boxes, and bags of thinset you need for a kitchen or bathroom backsplash before you set foot in a tile store. Enter your wall length and height, your tile dimensions, and the tiles-per-box count printed on the label, and it returns tile count, box count, square footage, and thinset bags in seconds. Because a backsplash is a long, narrow band of tile, it has a high perimeter-to-area ratio and demands many cuts around outlets, corners, and cabinet edges, so waste runs higher than on open floor areas. A 10 to 15 percent overage is the standard allowance and is built into the result. Backsplash tile is sold by the box, not by the individual piece, and box coverage varies widely. A box of 3x6 subway tile might hold 40 pieces and cover about 5 square feet, while a sheet-mounted mosaic box can cover 10 square feet or more. Confirming the tiles-per-box and pieces-per-sheet figures on the actual product label before you enter them is the single most common way to avoid an ordering error, because coverage is not standardized across brands.
How it’s calculated
Tiles = Area ÷ (tile width × length ÷ 144), plus waste. Boxes = tiles ÷ tiles per box. Thinset ≈ 1 bag / 95 sq ft.
Worked example
For a 15-foot run of backsplash at 1.5 feet tall, a common kitchen span between countertop and upper cabinets, using 3x6 inch subway tile at 40 tiles per box and a 15 percent waste allowance, the calculator returns 207 tiles across 6 boxes to cover 22.5 square feet. The bare wall needs 180 tiles; the waste factor adds the rest. One 50 lb bag of thinset covers that area with room to spare. Buying the full 6 boxes in one trip, rather than splitting the order, protects against dye-lot shade variation if you run short and have to return later.
Inputs
- Surface length
- 15 ft
- Surface width / height
- 1.5 ft
- Tile width
- 3 in
- Tile length
- 6 in
- Tiles per box
- 40
- Waste / overage
- 15 %
Result
- Tiles needed
- 207 tiles
- Boxes
- 6
- Area
- 22.5 sq ft
- Thinset (50 lb bags)
- 1
- Estimated material cost
- $113 – $563
Materials & pricing near you
Backsplash tile is sold by the box at tile showrooms, big-box stores, and online retailers. Entry-level ceramic subway tile runs at the low end of the per-square-foot range; mid-grade porcelain and handmade-look ceramic sit in the middle; glass, natural stone, and designer mosaic sheets command the top of the range for material alone. Labor in major metros such as New York and San Francisco can run 25 to 40 percent above suburban and rural rates. Online tile retailers often set freight minimums, so an order of only one or two boxes may not ship economically, pushing small jobs toward local pickup. To avoid visible shade differences across a wall, buy every box from the same production run, or lot number, on the label. No permit is required for backsplash tile installation.
Frequently asked questions
How do I measure a backsplash with outlets and windows?
Measure the full rectangle, length times height, without subtracting outlets or small windows. The area lost to those cutouts is smaller than the extra tile you waste cutting around them, so calculating off the full rectangle naturally covers it. Only for a very large opening, such as a wide window above a sink, is it worth subtracting that area and then adding back about 10 percent for the cuts along its edges.
Why does backsplash tile need more waste than floor tile?
A backsplash is a narrow band with a high perimeter-to-area ratio, so a large share of tiles must be cut to fit along the countertop, cabinet edges, and corners. Outlets require notch cuts that often ruin the offcut. A 15 percent waste factor is a safe default for a straight subway layout; diagonal, herringbone, or chevron patterns typically need 20 percent or more because the angled cuts produce more unusable scrap.
How many square feet does a box of subway tile cover?
It varies by manufacturer, but a common box of 3x6 inch ceramic subway tile holds 40 pieces and covers roughly 5 square feet. Sheet-mounted 1x2 or 1x1 inch mosaics often cover about 10 square feet per box. Always read the coverage figure on the actual box rather than relying on a general estimate, since box counts and sheet sizes are not standardized across brands.
Can I tile a backsplash myself, or should I hire a pro?
A straight subway layout on a flat, even wall is one of the more approachable DIY tile jobs: the area is small, the tiles are light, and you work at a comfortable counter height. Hire a pro for large-format stone that needs back-buttering, intricate mosaic patterns that demand precise grout-joint alignment, or walls that are noticeably out of plumb and need flattening before any tile goes up.