Everyday Math
Basic

Tiles Needed

Number of tiles to cover a floor.

Formula

N=AfloorAtileN = \frac{A_{floor}}{A_{tile}}

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Variables

A_{floor}Floor area
A_{tile}Tile area

Example

100 ft² ÷ 1 ft² = 100 tiles

How it works

This formula finds how many equal-sized tiles are needed by comparing the total floor area to the area covered by one tile. It works because covering a surface is a repeated-area problem: if each tile covers the same amount, you divide the whole area by the area of one piece to get the count. The result may need rounding up if the floor cannot be covered perfectly with whole tiles.

When to use it

Use this when planning a tiling project for a room, backsplash, patio, or any flat surface with identical tiles. It helps estimate how many tiles to buy before starting, so you can budget for the job and account for waste or cuts.

Worked example, step by step

Floor area = 48 ft² Tile area = 2 ft² N = A_floor ÷ A_tile N = 48 ÷ 2 N = 24 So, 24 tiles are needed.

Common mistakes to avoid

  • Using tile length or width instead of tile area
  • Forgetting to convert both measurements into the same units before dividing
  • Not rounding up when the division gives a fraction of a tile

Did You Know?

Add 10% for cuts and breakage.

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Reviewed & maintained by the FormulaWon editorial teamLast reviewed September 2026