Calculate the number of tiles and estimated tile cost.
A Tile Calculator helps you estimate how many tiles you need for a room, floor or wall. Enter the surface dimensions and tile size into your calculator to plan material quantities before starting your interior design or renovation project. An accurate estimate can help you manage costs, avoid unnecessary purchases and reduce delays during installation.
Whether you are planning a living room floor, kitchen backsplash, bathroom wall or bedroom flooring, measuring the area first makes it easier to compare tile sizes and calculate your material requirements. Always use the same measurement units for the surface and tile dimensions.
First, measure the length and width of the floor or wall. Multiply these measurements to find the total area. Next, calculate the area covered by one tile and divide the surface area by the area of a single tile.
Surface area = Length × Width
Tile area = Tile length × Tile width
Estimated tiles = Surface area ÷ Area of one tile
For example, a floor measuring 10 feet by 12 feet has an area of 120 square feet. If each tile covers 1 square foot, the basic estimate is 120 tiles before allowing for cuts, breakage or future replacements.
The table below shows sample room areas. These examples assume tiles cover 1 square foot each and do not include extra material.
| Room Size | Floor Area | Basic Tile Estimate |
|---|---|---|
| 10 × 10 ft | 100 sq ft | 100 tiles |
| 10 × 12 ft | 120 sq ft | 120 tiles |
| 12 × 12 ft | 144 sq ft | 144 tiles |
| 15 × 12 ft | 180 sq ft | 180 tiles |
Tile layouts often require cutting tiles around corners, doorways, edges and fixtures. Some tiles may also break during handling or installation. As a general starting point, many projects allow around 5–10% extra material, but the right amount depends on the tile pattern, room shape, tile type and installer recommendations.
For a 120-square-foot floor, adding 10% gives a planning quantity of 132 square feet of tile coverage. Check the coverage printed on each box and round up to whole boxes when purchasing. For diagonal layouts or complicated spaces, ask your installer or tile supplier whether a larger allowance is needed.
Before buying materials, measure the space carefully, confirm the tile dimensions and check how much area each package covers. The Tile Calculator provides an estimate, but unusual room shapes, grout spacing and installation patterns can affect the final quantity.
Explore our interior design tools for more practical planning resources, or visit Interiors Industries for interior inspiration and ideas for your home. For information about standard measurement units, you can also consult the NIST guide to SI units.