TileQuantCoverage math for tile, thinset and grout — before you buy.

Backsplash Tile Calculators

Tile for a kitchen backsplash, with the waste that a narrow strip full of outlets actually generates — plus the edge trim a floor never needs.

A backsplash is not a small floor. It generates far more waste per square foot, and it needs something a floor never does.

Why the waste allowance is higher

A narrow strip has much more perimeter per square foot than the same area spread across a floor. Every outlet is four cuts and most of a wasted tile — and the NEC requires a receptacle within 24 inches of any point on a kitchen counter, so a 12 ft run has three of them.

Layout multiplies it again. Stacked runs about 10%, running bond 12%, diagonal 15%, herringbone 20%.

Edge trim is the giveaway

A floor meets the wall and the baseboard covers the joint. A backsplash has exposed edges — at both ends, along the top if it stops below the cabinets, and around windows.

A raw cut edge is the single most obvious sign of a DIY backsplash, and it is the one thing you cannot add afterward without pulling tile off. Metal profile or bullnose, decided before you order.

Four inches or full height

A 4″ splash is a strip. It protects the wall, costs almost nothing, and dates a kitchen faster than anything else in it. Full height — counter to the underside of the wall cabinets, usually 18 inches — is what people mean when they say backsplash, and it hides the top edge under the cabinets.

Start from what people look at

Center the layout on the cooktop or the sink, and work outward. Cut tiles then land at the ends of the run where nobody looks, rather than dead center behind the range where everybody does.

Buy it all in one order

Kitchen lighting comes from directly above and rakes across the wall, which makes a color-lot difference between boxes far more visible than the same difference would be on a floor.

Backsplash tile for a 14 ft run, 18″ high, 4×12″ in running bond

Tile to buy
25.2ft²
21 ft² of wall plus 20% — about 76 × 4×12″ tiles in running bond
Elevationcabinetscounter14 ft18″4 outlets · 20% waste · 3 ft trim
Tile to buy25.2ft²
Tiles4×12″76tiles
Wall area14 ft × 18″ high21ft²
Waste allowance12% for running bond + 8% for 4 outlets20%
Outlets to cut aroundNEC wants one within 24″ of any point on the counter4outlets
Edge trimtwo vertical ends — the top runs under the cabinets3linear ft
Layoutoffset by half a tile, the classic subway layoutrunning bond
Heightfull height from counter to cabinets18″

Notes

  • Backsplash waste is not floor waste. A 18″ strip has far more edge per square foot than the same area on a floor, and every outlet is four cuts and most of a wasted tile. 20% here — 12% for the running bond layout and 8% for 4 outlets.
  • Offset by half a tile, the classic subway layout.
  • At 18″ this runs from the counter to the underside of the wall cabinets, so the top edge is hidden and only the two vertical ends need trim — 3 linear ft.
  • Start the layout from the most visible point — usually the centre of the cooktop or the sink — and work outward, so the cut tiles land at the ends where nobody looks.
  • Buy the whole job in one order. Tile is made in colour lots, and a second box bought three weeks later can be visibly different against the first under kitchen lighting.

Backsplash tile

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