Calculate the number of tiles needed to cover a room, including a wastage allowance for cuts and breakage.
A Tile Calculator estimates the number of tiles needed to cover a floor or wall area, based on the total area to be covered and the size of each individual tile, including an allowance for cutting waste. This tool helps homeowners and contractors accurately budget for flooring or wall tiling projects, avoiding the common problems of running short mid-project or over-ordering expensive excess material.
Number of Tiles Needed = (Total Area to Cover ÷ Area of One Tile) × (1 + Waste Percentage), where the waste percentage (commonly 10%) accounts for cuts, breakage, and pattern matching, and the total is typically rounded up to the nearest whole tile or box of tiles for practical purchasing.
Enter the total area you need to tile (or the room's length and width) and the dimensions of a single tile. The calculator returns the total number of tiles needed, including a recommended waste buffer, helping you order the right amount of material for your project.
Example 1: A room measuring 200 square feet, tiled with 12x12 inch tiles (1 square foot each), needs 200 tiles at minimum, plus a 10% waste buffer bringing the total to 220 tiles.
Example 2: The same 200 square foot room tiled with larger 18x18 inch tiles (2.25 square feet each) needs 200 ÷ 2.25 ≈ 89 tiles at minimum, plus 10% waste bringing the total to approximately 98 tiles.
Cutting tiles to fit around edges, corners, and fixtures inevitably produces some unusable offcuts, and having extra tiles on hand also protects against breakage during installation or future repairs, which is why ordering more than the exact calculated minimum is standard practice.
Diagonal tile patterns typically produce more cutting waste than a straight, grid-aligned layout, since more edge tiles require angled cuts, which is why some professionals recommend a higher waste percentage (sometimes 15% or more) for diagonal installations.
Wider grout lines slightly reduce the total tiled area covered by the tiles themselves for a given room size, though this effect is generally small enough that most calculators don't factor it in separately from the standard waste percentage buffer.
Break the irregular room into simpler rectangular sections, calculate the tile requirement for each section separately, and sum the totals together, applying the waste percentage to the combined total for the most accurate overall estimate.
Tiles are commonly sold in boxes covering a specific square footage, so once you know your total needed area including waste, dividing by the coverage per box tells you how many full boxes to purchase, typically rounding up to the next whole box.
Larger tiles generally require fewer individual pieces and grout lines, often reducing labor time and installation cost, whereas smaller tiles or intricate mosaic patterns typically require more installation time and expertise, affecting the total project cost beyond just tile material pricing.
The basic area-based calculation method is identical for floors and walls, though wall tiling often needs to account for openings like windows and doors that reduce the actual area needing coverage, requiring those openings to be subtracted from the gross wall area first.
Professional contractors often factor in project-specific details like complex layouts, specific tile patterns, historical waste rates from similar past projects, and buffer for future repairs, which can lead to a somewhat higher recommended quantity than a basic calculator's generic waste percentage assumption.
Many professionals recommend keeping a small additional reserve, sometimes an extra box, of the exact same tile batch for future repairs, since tile production runs (dye lots) can vary slightly between batches, making it hard to perfectly match a replacement tile purchased later.
Larger tiles with fewer grout lines can make a small room feel more spacious and visually uninterrupted, which is a common design consideration alongside the purely practical material quantity calculation this tool provides.
Standard area-based calculations focus on the main field tiles; specialty trim, bullnose, or edging pieces along exposed edges are typically calculated separately based on the linear length of exposed edge requiring finishing.