Tile Calculator
Estimate how many tiles you need for a floor or wall based on the surface dimensions and tile size.
Enter your surface measurements, tile dimensions, and waste allowance to calculate the required tile quantity and total coverage.
Calculate Tiles Needed
Enter all dimensions in feet and inches.
Surface Dimensions
Tile Dimensions
Waste Allowance
Box Information
Tile Estimate
How Does the Tile Calculator Work?
The calculator first determines the total area of the surface you want to cover. It then calculates the area of one tile using its length and width.
The surface area is divided by the area of one tile to determine the theoretical number of tiles. A waste allowance is then added to account for cutting, breakage, damaged tiles, and installation requirements.
Tiles Needed = Surface Area ÷ Tile Area × (1 + Waste %)
How to Calculate Tile Area
Tile area is calculated by multiplying the tile's length by its width. Because tile dimensions are commonly listed in inches while room dimensions may be measured in feet, the tile dimensions must first be converted to feet.
Tile Length in Feet = Tile Length in Inches ÷ 12
Tile Width in Feet = Tile Width in Inches ÷ 12
Tile Area = Tile Length × Tile Width
Why Add a Tile Waste Allowance?
Tile installations rarely use exactly the theoretical number of tiles. Some tiles may need to be cut around walls, corners, doors, fixtures, or other obstacles.
Tiles can also be damaged during transportation or installation. Keeping additional tiles can make repairs easier later, especially if the tile design is discontinued.
| Waste Allowance | Typical Situation |
|---|---|
| 5% | Simple layout with minimal cutting |
| 10% | Common starting estimate for many projects |
| 15% | More cutting or a more complex layout |
| 20%+ | Complex patterns, diagonal layouts, or significant cutting |
These are general planning ranges rather than manufacturer requirements. Your actual waste can vary by project.
Tile Calculator Example
Suppose a floor is 20 feet long and 15 feet wide. Its surface area is:
20 × 15 = 300 sq ft
Suppose the tiles are 24 × 24 inches. Each tile is 2 × 2 feet, giving an area of:
2 × 2 = 4 sq ft per tile
Without waste, the theoretical requirement is:
300 ÷ 4 = 75 tiles
With a 10% waste allowance:
75 × 1.10 = 82.5 tiles
Since tiles are purchased as whole units, the practical quantity is rounded up to 83 tiles.
Buying Tiles by the Box
Tiles are often sold in boxes containing a fixed number of tiles or a specified amount of square footage.
If you know how many tiles are included in each box, the calculator can also estimate the number of boxes required. The result is rounded up because partial boxes may not be available for purchase.
Boxes Needed = Tiles Required ÷ Tiles per Box
Floor Tile vs. Wall Tile Calculations
The basic area calculation works for both floors and rectangular walls. The main difference is the shape and layout of the surface being covered.
For a simple rectangular floor, multiply length by width. For a rectangular wall, multiply wall width by wall height. If multiple surfaces are being tiled, calculate each area separately and add them together.
How to Use the Tile Calculator
- Measure the length of the surface in feet.
- Measure the width of the surface in feet.
- Enter the tile length and width in inches.
- Enter a waste allowance based on the complexity of the installation.
- Optionally enter the number of tiles contained in each box.
- Click Calculate Tiles.
- Review the surface area, tile area, estimated quantity, waste allowance, and boxes required.
Tips for Measuring a Tiling Project
- Measure the length and width at more than one point if the surface may not be perfectly square.
- Divide irregular rooms into simple rectangular sections and calculate each section separately.
- Account for areas that will not receive tile, such as permanent fixtures or openings.
- Check the actual dimensions printed on the tile packaging because nominal tile sizes can differ from exact measurements.
- Keep some spare tiles for future repairs whenever practical.
Important Note About Tile Estimates
This calculator provides a planning estimate based on the dimensions and waste allowance you enter. Actual tile requirements can vary because of room shape, grout joints, tile layout, cuts, damaged tiles, and installation patterns.
For a final purchase quantity, compare the calculated result with the manufacturer's packaging information and your installer's recommendations.
Frequently Asked Questions
How many tiles do I need?
The number depends on the surface area, tile size, and waste allowance. Enter those measurements into the calculator to estimate the required quantity.
Why are tile dimensions entered in inches?
Tile manufacturers commonly list tile sizes in inches. The calculator converts those measurements to feet so they can be compared with the surface area.
How much tile waste should I allow?
A 10% allowance is a useful starting point for many simple projects, but projects with complex patterns or extensive cutting may require a higher allowance.
Does the calculator account for grout?
The calculator estimates tile quantity based on tile dimensions and surface area. It does not separately model grout joint width.
Can I calculate wall tiles with this calculator?
Yes. For a rectangular wall, use the wall width as the surface length and the wall height as the surface width.
Should I buy extra tiles?
Keeping some spare tiles can be useful for future repairs. The appropriate amount depends on the project, tile type, installation pattern, and availability.