Kitchen Backsplash Calculator

A kitchen backsplash tile installation requires calculating the exact wall area to be tiled, accounting for windows, outlets, and irregular shapes, then adding a waste factor to cover cuts, breakage, and future repairs.

Formula: Backsplash Area = Counter Run Length × Backsplash Height Order Amount = Backsplash Area × (1 + Waste Factor)

Small cutouts for outlets are covered by the waste factor, so ignore those. A window over the sink is a different matter: measure it and put the figure in the openings box, and it comes off before the waste is applied. If you know your price per square foot, the tile cost is just Order Amount × Price.

Waste factors, and what this page charges for each

The three options in the dropdown map onto the trade figures like this:

Mosaic sheets are the one that surprises people. A plain sheet count suggests 10%, the same as subway, because the sheets butt together neatly across an open wall. Then you reach the outlets and the inside corners and start cutting individual chips off the mesh, and a kitchen backsplash has a lot of both. 15% is the honest figure for a real kitchen.

True herringbone runs closer to 20%. There is no 20% option here, so pick diagonal and buy one extra box on top.

Natural stone with visible colour variation also wants 15%, not for cuts but so you can reject the pieces that do not sit right next to their neighbours.

Common backsplash zones:

• Counter to upper cabinets: typically 15–18 inches of height
• Behind range/stove: full height from counter to the bottom of the range hood, often 24–36 inches, and a natural focal point for decorative tile

Worked example: A kitchen counter runs 120 inches long, and you want an 18-inch-tall backsplash.

• Area = 120 × 18 = 2,160 sq in ÷ 144 = 15 sq ft
• Straight subway tile, 10% waste: 15 × 1.10 = 16.5 sq ft to order
• At $4.50/sq ft, tile cost = 16.5 × $4.50 = $74.25

Budget a little more for mastic (about 1 gallon per 40 sq ft) and grout, then add professional installation if you are not doing the work yourself.

Rough price ranges, approximate and dated 2024. Tile prices move, so treat these as a sanity check on a quote rather than a number to plan around, and put your own figure in the price box:

• Ceramic subway: $5 to $15 per sq ft
• Glass: $10 to $30 per sq ft
• Natural stone: $12 to $40 per sq ft
• Installation labour: $8 to $15 per sq ft

Buying tip: Always buy from the same dye lot, because tile colour varies between batches. Buy all tiles in one purchase and keep 5–10% in storage for future repairs.