Tile Calculator
Find out how many tiles you need for a floor or wall, including a waste allowance.
- Tiles needed132 tiles
- Room area120 sq ft
- Area incl. waste132 sq ft
- Tile area1 sq ft each
How to use
- Enter the room length and width in feet.
- Enter the tile size in inches (e.g. 12 for a 12×12 tile).
- Set a waste allowance (10% is standard) and read the tile count.
About this calculator
This tile calculator finds your room's square footage, converts each tile to square feet, and divides to get the tile count. It adds a waste factor for cuts, breakage and future repairs — 10% is typical for straight-lay patterns; use 15% for diagonal or herringbone. Always buy from the same lot number so colours and shades match. Keep a few spare tiles for repairs.
🧮 How it's calculated
- 1Step 1 — Tile area in ft²: Tile area = (Tile size in inches ÷ 12)²
- 2Step 2 — Room area: Area = Length × Width
- 3Step 3 — Add waste: Area with waste = Area × (1 + Waste% ÷ 100)
- 4Step 4 — Tile count: Tiles = ⌈Area with waste ÷ Tile area⌉
Tiles = ceil( Room area × (1 + Waste%) / Tile area ), where Tile area = (Tile in ÷ 12)².
Frequently asked questions
How much waste should I add for tiles?+
10% is standard for straight-lay patterns. Use 15% for diagonal cuts and complex room shapes, which produce more off-cuts.
What size tile is easiest to install?+
12×12 inch tiles are the most common and beginner-friendly. Larger formats (18×18 or 24×24) look impressive but require a flatter subfloor.
Can I use this for wall tiles too?+
Yes. Enter the wall width and height instead of room length and width to calculate tiles for a shower wall or backsplash.