Tile Calculator - How Many Tiles Do I Need? Free Tool

Tile Calculator

100% free · Runs 100% in your browser · Tiles, waste allowance & boxes · No signup needed

Tiles needed = floor area ÷ tile area, rounded up, plus waste. Example check: a 10 ft x 12 ft room = 120 sq ft; 12 in x 12 in tiles = 1 sq ft each; 120 tiles + 10% waste = 132 tiles. Irregular rooms, cuts and pattern matching need more than rectangle maths — measure the real layout and keep spare tiles, do not order exactly the computed number.

Try an example: 10 x 12 ft room, 12 x 12 in tiles, 10% waste

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Ordering tiles is one of those jobs where a small maths mistake becomes an expensive problem. Order too few and you face a second delivery, a different dye batch that does not quite match, and a half-finished floor. Order far too many and you have paid for boxes that sit in the garage for years. The free Tile Calculator from FistHost removes the guesswork. Enter your room size, your tile size and a waste allowance, and it tells you how many tiles you need, how many boxes to buy, and how much area you are covering, in seconds.

The maths behind the tool is straightforward. First it works out the area of your floor or wall by multiplying length by width. Then it works out the area of a single tile. Dividing the room area by the tile area gives the exact number of tiles that would cover the space with no cuts and no breakages. Because real rooms always involve cuts, breakages and offcuts that cannot be reused, the tool then adds a waste allowance, typically 10 percent, and rounds the final answer up to a whole tile. The formula is simple: tiles needed equals floor area divided by tile area, rounded up, plus the waste allowance.

Here is the worked check that shows the calculation step by step. Take a room that measures 10 feet by 12 feet. Its floor area is 10 times 12, which is 120 square feet. Now take tiles that measure 12 inches by 12 inches. Each tile covers exactly 1 square foot, so the room needs 120 tiles before waste. Add the standard 10 percent waste allowance, which is 12 tiles, and the total becomes 132 tiles. Type those same numbers into the calculator and you will get 132, and if your tiles come 10 to a box, the tool will also tell you to buy 14 boxes, since 13.2 boxes must be rounded up to whole boxes.

Getting your measurements right matters more than anything else in this calculation. Measure the length and width of the room at its longest and widest points, in feet and inches, and enter them exactly. For a wall, measure its height and width instead. If the room is L-shaped or has alcoves, measure it as two or more rectangles and add their areas together, or run the calculator once for each rectangle and add the tile totals. A tape measure, a notepad and five careful minutes will save you far more trouble than any later correction can fix.

Tile size is the second input, and it deserves the same care. Tiles are sold by their nominal size, such as 12 by 12 inches or 60 by 60 centimetres, but the actual size can differ by a millimetre or two, and the grout joint between tiles also takes up space. The calculator works with the tile size you enter, so if you plan wide grout joints or are using unusually thick spacers, it is sensible to add a little extra waste. Most people find the standard 10 percent allowance covers normal cutting and breakage comfortably, but diagonal layouts, herringbone patterns and rooms with many corners or curves can push waste to 15 percent or more.

The waste percentage picker is there because no two rooms are alike. A plain square room with a straight grid layout wastes the least, because most offcuts can be reused on the opposite side. A room with doorways, radiator pipes, curved edges or a patterned layout wastes more, because more tiles must be cut and fewer offcuts fit anywhere else. The tool lets you choose your own waste percentage rather than forcing one number on every job, so you can match the allowance to the room in front of you instead of to an average room that does not exist.

Boxes are where the final shopping list comes together. Tiles are sold by the box, and different tiles come in different quantities per box, so the calculator asks how many tiles each box contains and rounds your box count up to the next whole box. You cannot buy part of a box, and rounding down would leave you short, so the tool always rounds up. Check the tiles-per-box figure on the product listing or the box itself before you buy, because it varies widely between a small mosaic sheet and a large-format porcelain tile, and getting it wrong is the most common cause of under-ordering.

The grout-area note in the results is a useful extra. It reminds you that the area you are tiling is not just tiles: the joints between them need grout, and the edges need trim or sealant. While the calculator does not replace a grout coverage chart, knowing your total tiled area lets you estimate grout, adhesive and underlay quantities from the coverage figures printed on those products. Buying adhesive and grout in the right quantities at the same time as the tiles saves a second trip to the store in the middle of the job.

One honest limitation is worth stating plainly. The calculator does rectangle maths, but real rooms are rarely perfect rectangles. Irregular rooms, angled walls, curved bays, patterned layouts and feature strips all need more than a length-times-width calculation. The computed number is an excellent starting point, but you should measure the real layout, sketch where the cuts will fall, and keep spare tiles from the same batch for future repairs. Never order exactly the computed number with no spare: a cracked tile in two years time is far harder to replace if its batch has been discontinued. A few spare tiles stored flat in a dry place are cheap insurance.

Before you order, it helps to double-check the whole job. Confirm your room measurements a second time, confirm the tile size and the tiles per box, and confirm the waste percentage suits your layout. If you are tiling both a floor and walls, run the calculator separately for each surface, since wall tiles and floor tiles are often different sizes. If you are mixing tile sizes, such as a border or a feature panel, calculate each size separately and add the results. A careful second pass takes two minutes and catches the errors that cost money.

One more practical tip concerns the pattern you plan to lay. A straight grid is the simplest and wastes the least, because cut pieces from one side of the room often fit the other side. A brick or subway pattern also reuses offcuts well, since each row starts with a half tile. A diagonal layout looks striking but wastes considerably more, because every edge tile must be cut at an angle and the triangular offcuts rarely fit anywhere else. Herringbone and chevron patterns are beautiful and also wasteful for the same reason. If you have your heart set on a patterned layout, run the calculator with a higher waste percentage, and buy one extra box beyond the result if your budget allows. The small extra cost is nothing compared with the cost of a stopped job.

For other home and renovation maths, the Paint Calculator works out how much paint a room needs, and the Unit Converter switches between feet, inches, metres and centimetres whenever your measurements and your tile sizes use different units. Both are free, work instantly in your browser, and pair naturally with this tile calculator when you are planning a room from start to finish.

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Starting a website should not eat into your renovation budget, which is why FistHost keeps shared hosting at $0.99/month and includes a free domain with annual plans, giving tradespeople, bloggers and small shops a professional online presence for less than the cost of a single box of tiles.