Tile calculator
Calculator
The calculator needs JavaScript. The tables below give the same numbers for common cases.
How it is worked out
- One tile = 12 × 12 ÷ 144 = 1 sq ft.
- Tiles = area ÷ tile area = 120; add 10% and round up: 132. Diagonal layouts and patterns need more.
| Inputs | Answer |
|---|---|
| Area to cover: 120; Tile length: 12; Tile width: 12; Extra for cuts and waste: 10; Tiles per box: 10 | Covering 120 sq ft with 12 × 12 in tiles takes 120 tiles, or 132 with 10% extra. |
| Area to cover: 45; Tile length: 24; Tile width: 12; Extra for cuts and waste: 15; Tiles per box: 8 | Covering 45 sq ft with 24 × 12 in tiles takes 23 tiles, or 26 with 15% extra. |
| Area to cover: 200; Tile length: 18; Tile width: 18; Extra for cuts and waste: 10; Tiles per box: 0 | Covering 200 sq ft with 18 × 18 in tiles takes 89 tiles, or 98 with 10% extra. |
How to use it
The number of tiles is the area divided by the area of one tile, plus an allowance for cuts and breakage (10% is common; more for diagonal or patterned layouts). A 12 × 12 inch tile covers 1 square foot, so 120 square feet needs 120 tiles, or 132 with 10% extra.
Buy a little extra from the same batch, because colours can vary between batches.
Frequently asked questions
How do I calculate how many tiles I need?
Divide the area by the area of one tile and add 10% for waste.
What waste factor should I use?
About 10% for straight layouts and 15% for diagonal ones.
How many tiles in a box?
It is printed on the box; enter it for a box count.
Method: standard arithmetic shown step by step; no outside data is used. Checked 2026-11-12.
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General information only. Results are plain arithmetic on the numbers you enter; check anything important (money, health, school work) against your own records or the official source.