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Peel and Stick Tile Calculator

Enter your area and tile size to find how many tiles you need.

How it is calculated

The area is entered as a width and a length in feet, the tile as a width and a height in inches, and the waste as a percentage. The tool computes area = width × length (ft²), tile area = (tile width ÷ 12) × (tile height ÷ 12) (ft²), then tiles = ceil(area ÷ tile area × (1 + waste ÷ 100)). The count is always rounded up to a whole tile. If you leave the waste empty it uses 10%; entering 0 means no allowance at all. All four size fields must be above zero. The tool treats the floor as one rectangle and does not subtract doorways, cabinets or other obstacles, and it does not pack tiles per box.

Worked example

A floor is 10 ft by 12 ft, covered in 18 in × 18 in tiles with 10% waste. Floor area = 10 × 12 = 120.00 ft². One tile = (18 ÷ 12) × (18 ÷ 12) = 1.5 × 1.5 = 2.250 ft². Tiles without waste = 120 ÷ 2.25 = 53.33. Adding 10% gives 53.33 × 1.10 = 58.67, which rounds up to 59 tiles. Check the box size, since tiles are usually sold in packs and you may have to buy a few more.

Try this example →

Common mistakes

  • Entering the room size in inches or the tile size in feet. Room dimensions are in feet and tile dimensions in inches, so mixing them gives a count off by a factor of 144 or more.
  • Entering the waste as 0.10. The field is a percentage, so 10 is correct and 0.10 would mean a tenth of one percent.
  • Setting the waste to 0 for a diagonal pattern or a room with many cuts. Cutting at the edges and around fixtures means you need more tiles than the pure area math suggests.
  • Measuring a room with alcoves or a closet as one rectangle without adding the extra areas, or including large cabinets that the tile will not cover.
  • Ignoring the pack size and the dye lot. Tiles come in boxes and different batches can vary slightly in colour, so buy everything at once.

About this calculator

The calculation is straightforward coverage math: number of tiles = (area to cover ÷ area per tile), rounded up and increased by a waste allowance — typically 10% for a simple square layout and up to 15-20% for diagonal patterns, rooms with lots of cuts, or a first-time DIY install where mistakes are likely. That buffer accounts for edge cuts, pattern matching, and breakage.

DIY homeowners use this before ordering peel-and-stick vinyl or LVT tile so they don't run short mid-project and end up with a mismatched dye lot on a return trip, while flooring installers and contractors use the same math to quote material costs accurately on a job.

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  • Editorial team

    The waste percentage is the number you set by judgement, and a dry layout helps you choose it. Lay one row of loose tiles along each wall before peeling anything. If the last tile in a row would be a thin sliver, move the starting line by half a tile, which can change how many cuts you make. Messy rooms with many cuts justify the higher end of the range. How many corners, doorways or fixtures does your room have to cut around?

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