Tile Calculator
Calculate how many tiles and boxes you need for any floor or wall project. Accounts for tile size, layout pattern, and waste for accurate material and cost estimates.
Add installation cost per sq ft
Total Boxes Needed
9
Total Tiles
88
Area
80 sq ft
What Is a Tile Calculator?
A tile calculator is a planning tool that estimates how many individual tiles and boxes you need to cover a floor, wall, backsplash, or any tiled surface. By converting your room dimensions into a precise tile and box count, it removes the guesswork from one of the most common — and costly — mistakes in tiling projects: buying too little or too much material.
Tiles are sold in boxes that cover a fixed area, and once a production run (or "shade lot") sells out, future boxes may not match the color and finish of your original purchase. That makes it essential to calculate accurately and buy all your tiles, plus a sensible overage, in a single order. This calculator factors in your tile size, the layout pattern you choose, and a waste allowance to give you a reliable shopping list and cost estimate.
Whether you're tiling a small bathroom floor, a kitchen backsplash, or a large open-plan living area, this tool helps you order with confidence, budget correctly, and keep a few spare tiles on hand for future repairs.
How to Use the Tile Calculator
Input the length and width of each surface you want to tile. Add multiple areas with the "Add Area" button to plan an entire project — floors, walls, and backsplashes — at once.
Select your tile size from common options like 12"×12", 12"×24", or subway tiles. The calculator uses each tile's coverage area to work out exactly how many you need.
Choose your installation pattern. Straight grids waste the least material, while diagonal and herringbone layouts require more tiles, so the waste factor adjusts automatically.
See the total tiles, boxes, and full cost breakdown instantly. Set your tiles-per-box and price-per-box, then toggle labor to match your exact project scope.
The Tile Formula Explained
Calculate the total area of each surface in square feet. For a 10 × 8 ft bathroom floor: 10 × 8 = 80 sq ft. Add up every area you plan to tile to get the project total.
Add a waste allowance for cuts, breakage, and pattern alignment. A straight layout typically needs 10%, while diagonal and herringbone patterns can need 15-20%. For 80 sq ft at 10% waste: 80 × 1.10 = 88 sq ft.
Boxes = ⌈ Area With Waste ÷ (Tiles per Box × Sq Ft per Tile) ⌉
Divide the area (with waste) by the coverage of a single tile to get the tile count, then divide by the coverage of a full box to get boxes needed. Both round up, since you can only buy whole tiles and whole boxes. For 88 sq ft using 12"×12" tiles (1 sq ft each) at 10 per box: 88 tiles = 9 boxes.
Real-World Examples
Tips for Buying & Installing Tile
Tiles vary slightly in color between production batches. Order all your tile from the same shade (or batch) number in a single purchase, and keep a few spares for future repairs.
Straight grids waste about 10%, but diagonal layouts need 15% and herringbone up to 20% because of the many angled cuts. Choose the right waste factor before ordering.
This calculator estimates tile, but you also need grout, thinset mortar, spacers, and sealer. Budget for these separately based on tile size and joint width.
Rooms are rarely perfectly square. Border tiles, niches, and around fixtures all require cuts, so always round up generously to avoid running short mid-job.
Bigger tiles cover faster with fewer grout lines, making rooms feel larger and easier to clean. Smaller mosaics offer more grip but need much more labor and grout.
Large-format tiles need a very flat substrate to avoid lippage (uneven edges). Plan for self-leveling underlayment if your subfloor is not perfectly level.
Frequently Asked Questions
It depends on tile size. A 12"×12" tile covers exactly 1 square foot, so you need 1 per sq ft. A 12"×24" tile covers 2 sq ft (0.5 tiles per sq ft), while a 3"×6" subway tile covers only 0.125 sq ft, needing 8 per sq ft. This calculator handles the math automatically based on your selected size.
Order 10% extra for a straight layout, 15% for diagonal, and up to 20% for herringbone or complex patterns. The extra covers cuts, breakage, and future repairs. Always keep a few spare tiles, since matching shade lots later is often impossible.
Yes. Diagonal and herringbone patterns require many angled cuts, which generate more waste than a simple straight grid. That is why selecting a pattern in this calculator automatically adjusts the recommended waste factor.
You can tile both with this calculator by adding separate areas, but remember floor and wall tiles often differ in size, thickness, and rating. Add each surface as its own area and select the appropriate tile for accurate counts.
For small obstructions like a toilet base or cabinet, it is usually safest to tile the full rectangular area and rely on your waste factor to cover cuts. For very large built-ins, you can reduce the area dimensions accordingly.
Tiles are individual pieces; boxes contain a fixed number of tiles covering a set area. Stores sell tile by the box, so this calculator rounds up to whole boxes — you cannot buy a partial box.
Understanding Tile Types & Selection
| Type | Best For | Durability |
|---|---|---|
| Porcelain | Floors, wet areas, high-traffic | Very High |
| Ceramic | Walls, backsplashes, light floors | High |
| Natural Stone | Feature floors, luxury spaces | High (needs sealing) |
| Glass | Backsplashes, accents | Moderate |
| Mosaic | Showers, borders, detail work | Moderate-High |
Choosing the right tile is about matching the material to the space. Porcelain tile is denser and less porous than ceramic, making it the top choice for floors, bathrooms, and high-traffic areas. Ceramic tile is more affordable and easier to cut, ideal for walls and backsplashes. Natural stone like marble or travertine brings unique character but requires periodic sealing to resist stains.
Tile ratings matter too. The PEI (Porcelain Enamel Institute) scale rates a tile's wear resistance from 1 (walls only) to 5 (heavy commercial floors), while the COF (coefficient of friction) rating tells you how slip-resistant a tile is — important for wet areas. For authoritative standards on tile installation, the Tile Council of North America (TCNA) publishes the industry handbook used by professionals. For practical buying and installation guidance, the Spruce tile buying guide offers beginner-friendly advice.
By combining an accurate tile estimate from this calculator with the right tile type and rating for your space, you can avoid costly reorders, minimize waste, and achieve a durable, professional-looking finish. Always order extra from the same shade lot, plan for grout and thinset, and store leftover tiles flat in a dry place for future repairs.