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Backsplash Tile Calculator

Backsplashes are small areas with lots of cuts around outlets, windows and cabinets, so an accurate tile count with the right waste allowance matters. Enter the backsplash size and tile dimensions to get the number of tiles and boxes.

Enter your measurements

Measurements
in

Total run of countertop wall to be tiled.

in

The gap between countertop and upper cabinets is often about 18 in (45 cm).

ft²

Windows or other large areas that will not be tiled.

in
in

For mosaic sheets, enter the sheet size and a joint of 0.

in
Material & assumptions
%

10% for straight layouts; 15% or more for herringbone, diagonal patterns or many outlets to cut around.

tiles

Enter your measurements and press Calculate to see quantities, a material breakdown and an optional cost estimate.

How the calculation works

  • Tile area = (Tile width + Grout) × (Tile height + Grout)
  • Tiles = (Wall area − Excluded area) ÷ Tile area
  • Total = Tiles × (1 + Waste %), rounded up

Grout joints are small but add up across many tiles, so they are included in each tile's footprint.

Assumptions used

  • Tiles are rectangular and laid in a straight or brick (running bond) pattern.

Example calculation

A 120 × 18 in backsplash using 3 × 6 in subway tiles, ignoring grout, with no waste.

  1. 1Wall area: 120 × 18 = 2,160 in²
  2. 2Tile area: 3 × 6 = 18 in²
  3. 3Tiles: 2,160 ÷ 18 = 120

Result: 120 tiles before waste; with 10% waste, buy 132.

How to measure your project

  • Measure each wall section between countertop and cabinets separately and add the widths if heights are the same.
  • Subtract large windows, but not outlets; the cuts around outlets create waste anyway.
  • For mosaic sheets, enter the sheet size as the tile size and set grout to 0.

Frequently asked questions

How much extra tile should I buy for a backsplash?

Around 10% for straight layouts and 15–20% for herringbone, chevron or diagonal patterns. Backsplashes have a high proportion of cuts relative to their size.

What grout width should I use for subway tile?

1/16 in (1.5 mm) to 1/8 in (3 mm) is common for subway tile. Check the tile manufacturer's recommendation.

Results are estimates based on the measurements and assumptions you enter. Always confirm product specifications, local building codes and final quantities with your supplier or a qualified professional. See our disclaimer.