How many tiles do I need?

Convert a rectangular floor or wall into whole tiles and cartons using the actual tile dimensions, box quantity, and layout allowance.

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ToolTile Calculator
Input
Output
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Preview

How it works

Surface length × width is increased by the selected cutting percentage, then divided by tile area after millimetres become metres. Tiles round up to whole units before division by the carton quantity rounds up again and exposes the spare count.

Formula
boxes = ceiling(ceiling(adjusted area ÷ tile area) ÷ tiles per box)
  • Tile Mountain recommends about 10% for a straight layout and more for diagonal or herringbone work.
  • Box quantity and waste remain required because packaging, room shape, pattern, and cuts vary.

Worked example

A 4m by 3m floor, 300mm tiles
11 tiles per box, 10% waste for cuts
Input
											Length m: 4
Width m: 3
Tile length mm: 300
Tile width mm: 300
Tiles per box: 11
Waste percent: 10
Output
												Area m2: 12
Tile area m2: 0.09
Area with waste: 13.2
Tiles needed: 147
Boxes needed: 14
Spare tiles: 7

When to use this

Bathroom floors use a straight-layout allowance, splashbacks total wall rectangles, and diagonal or herringbone layouts raise the allowance for perimeter cuts.

Edge cases

  • A fractional tile rounds upward before carton counting because one partial final coverage area still needs a complete tile to cut.
  • Sixty-one tiles sold ten per carton require seven boxes and leave nine spare, not 6.1 purchasable cartons.
  • An L-shaped room entered as its bounding rectangle includes the missing corner; measure and total its rectangular sections instead.

References