Free Home Improvement Calculators
Find out exactly how many tiles and boxes you need — supports any tile size, straight or diagonal layout, feet or meters.
Fill in your project details and click Calculate Tiles.
The basic formula is straightforward: divide the total area of the room by the area of a single tile, then add a waste factor to account for cuts and breakage.
Multiply the width by the length to get the total square footage (or square meters). Subtract any areas that won't be tiled, such as kitchen islands, built-in cabinets, or bathtubs.
A straight grid layout typically needs 10% extra. A diagonal (45°) layout requires 15% or more because every perimeter tile must be cut at an angle, producing more offcuts. For irregular rooms or intricate patterns, go up to 20%.
Divide the total tile count by the number of tiles in each box, then always round up — you cannot buy a partial box. Buy one extra box if your budget allows; dye lots vary between production runs, and matching tiles later can be difficult.
| Size (in) | Size (cm) | Common Use |
|---|---|---|
| 12 × 12 | 30 × 30 | Bathrooms, kitchens, general floor |
| 18 × 18 | 45 × 45 | Living rooms, entryways |
| 12 × 24 | 30 × 60 | Modern bathrooms, shower walls |
| 24 × 24 | 60 × 60 | Large open spaces, commercial look |
| 24 × 48 | 60 × 120 | Contemporary large-format floors |