Tile & Flooring Calculator
Calculate exactly how many tiles you need for any floor or wall project. Enter your room dimensions and tile size, choose a layout pattern, and get the total quantity with waste allowance and cost estimate — all in your browser, completely free and private.
Room Dimensions
Tile Size
Layout & Waste
Cost (Optional)
Tile Layout Preview
Tile Size Comparison
| Tile Size | Area per Tile | Tiles Needed |
|---|
How the Tile Calculator Works
This tile calculator estimates the number of tiles required for any floor or wall project by dividing the total surface area by the area of a single tile, including grout gaps. It accounts for the layout pattern you choose and adds a waste allowance to ensure you buy enough material for cuts, breakages, and pattern matching. Straight layouts are the most efficient, requiring the least cutting and material waste. Diagonal installations angle tiles at 45 degrees, creating a visually striking pattern but generating more off-cuts along walls and edges — typically adding around 15 percent extra material. Herringbone patterns, where rectangular tiles interlock in a zigzag arrangement, produce even more waste due to the angled cuts at every boundary, adding roughly 20 percent to your order. The calculator also factors in grout spacing, which slightly reduces the effective area each tile covers and ensures your estimate matches real-world installation conditions.
Getting the right tile quantity is critical for any renovation project. Ordering too few tiles means a mid-project trip to the store, where the same batch or dye lot may no longer be available, leading to visible color differences on your finished floor or wall. Ordering too many wastes money and leaves you with surplus material. The standard recommendation is to add 10 percent waste for straight layouts in simple rectangular rooms, increase to 15 percent for diagonal patterns or rooms with many alcoves and corners, and use 20 percent for herringbone or complex geometric patterns. This calculator handles all of these scenarios automatically, giving you the exact number of tiles and boxes to purchase.
Choosing the Right Tile Size
Tile size significantly affects both the look and cost of your project. Large-format tiles such as 24-by-24-inch create a modern, seamless appearance with fewer grout lines and make small rooms look larger. However, they require a perfectly level subfloor and are harder to cut, increasing installation labor costs. Medium tiles in the 12-by-12 to 18-by-18-inch range offer the best balance of aesthetics, ease of installation, and material efficiency. Small tiles like 4-by-4 or 6-by-6-inch are ideal for backsplashes, shower walls, and accent areas, but using them on large floors dramatically increases the number of grout lines and installation time. The comparison table in this calculator shows how many tiles of each common size you would need for your room, helping you make an informed decision before purchasing.
Beyond the tile count, consider the cost implications. Larger tiles generally cost more per piece but may require fewer tiles overall and less labor time. Smaller tiles are cheaper individually but the total cost can be higher once you factor in additional grout, longer installation time, and more cuts. Use the optional cost fields in this calculator to compare your total material expense across different tile sizes before committing to a purchase.
Tips for Accurate Tile Estimation
Always measure your room at the widest points, as walls are rarely perfectly straight. For L-shaped or irregular rooms, divide the space into rectangles, calculate each section separately, and add the results together using the direct area input mode. When tiling walls, measure each wall individually and account for window and door openings by subtracting their area from the total. For shower enclosures, include all three walls plus the floor. Always round up to the nearest full box when ordering, and keep a few extra tiles stored safely for future repairs — matching tiles years later can be nearly impossible if the product is discontinued. Finally, check your retailer's return policy before ordering, as many stores accept unopened boxes, allowing you to buy slightly more than needed without financial risk.
Frequently Asked Questions
How much extra tile should I buy for waste?
For straight layouts in simple rectangular rooms, add 10 percent extra. For diagonal layouts, add 15 percent because the angled cuts along walls generate more waste. For herringbone patterns, add 20 percent due to the complex cuts at every boundary. If your room has many alcoves, niches, or an irregular shape, consider adding an extra 5 percent on top of the pattern-based waste. This calculator automatically adds waste based on your selected pattern and waste factor, so the total already includes the recommended overage.
Does grout width affect how many tiles I need?
Yes, grout width affects the total tile count. Wider grout joints effectively increase the footprint of each tile, meaning you need slightly fewer tiles. The standard grout width is 3mm for rectified tiles and 5mm to 6mm for standard tiles. This calculator includes grout spacing in its calculations. For typical 3mm joints on 12-inch tiles, the difference is small — roughly 1 to 2 percent fewer tiles compared to zero grout — but it becomes more significant with smaller tiles or wider joints.
What is the difference between straight and diagonal tile layout?
Straight layout places tiles parallel to the walls in a simple grid pattern. It is the easiest to install and produces the least waste. Diagonal layout rotates the grid 45 degrees so tiles sit at an angle to the walls. This creates a more dynamic visual effect and can make rooms appear larger, but every tile touching a wall must be cut at a 45-degree angle, generating significantly more waste — typically 15 percent more material. Diagonal layouts also require more skill and time to install correctly, increasing labor costs.
How do I calculate tiles for an L-shaped room?
Divide the L-shaped room into two or more rectangles. Measure the length and width of each rectangle separately, calculate the area of each, and add them together to get the total area. Then use the direct area input mode in this calculator by selecting Total Area Directly from the Input Mode dropdown. Enter the combined area, and the calculator will determine the correct number of tiles with waste allowance for the entire L-shaped space.
Can I use this calculator for wall tiles?
Yes. To calculate wall tiles, measure the height and width of each wall you want to tile. Enter these as the room length (height) and room width (width of the wall). For multiple walls, calculate each wall separately and add the areas together, then use the direct area input mode. Remember to subtract the area of any windows, doors, or openings that will not be tiled. Wall tiling typically uses the same waste factors as floor tiling, though complex patterns around fixtures may require slightly more waste.
How many boxes of tile should I order?
This calculator divides the total number of tiles (including waste) by the number of tiles per box and rounds up to the nearest whole box. You cannot buy partial boxes at most retailers. Always confirm the tiles-per-box count on the product packaging, as it varies by manufacturer and tile size. It is wise to order one extra box beyond the calculated amount to have replacement tiles available for future repairs, since matching tiles from a different production batch may show slight color variations.