Tiles and boxes for a floor or wall, with the grout line and wastage counted
Runs in your browser. Nothing you type is sent anywhere. Updated on 24 Oct 2026.Tile Calculator counts tiles and boxes for a floor or wall. A 12 by 10 foot room in 600 mm tiles with a 2 mm grout line takes 31 tiles bare, 34 after ten per cent wastage, and nine boxes of four with two tiles spare. Grout, wastage and box size are all editable.
Under "Measure by" choose Room size and enter the Length and Width, or choose Area and enter the "Area to tile".
Enter any "Untiled area to deduct", such as a doorway or a kitchen platform.
Pick a tile size chip such as 600 x 600 mm, or type the Tile width and Tile height, then set the Grout line and Wastage.
Enter "Tiles in one box" from the carton, and a "Price per box" if you want the cost.
Read "Boxes to order" and "Tiles needed", then press "Share result" to copy a link with these inputs.
Dividing a floor area by a tile area gives a number that is always a little too small, and most tile calculators print it anyway.
The reason is the grout line. A 600 mm tile laid with a 2 mm joint occupies 602 mm, so it covers 0.3624 square metres of floor rather than 0.36. Over a large floor that difference is worth a tile or two, and on small mosaic or subway tiles with a 3 mm joint it is worth considerably more. This page uses the tile plus its joint, and shows what share of the surface the grout takes.
Wastage is the second number that matters and it is genuinely a judgement. Five per cent is enough for a plain rectangular room laid straight. Ten is the common advice. Fifteen or more is realistic for a diagonal lay, a patterned floor, or a room full of alcoves and pillars where almost every perimeter tile gets cut. The box is yours to set, because no calculator can see your room.
Boxes are the third. Tiles per box is a property of one manufacturer's packing, not of the tile: a 600 x 600 box is usually four, an 800 x 800 box is often three, and small wall tiles come eight or ten to a box. Check the carton and type the number in. The page then shows how many tiles will be left over in the last box, which is worth knowing before you decide whether to keep a spare box for repairs.
One honest limit: a count from an area is not a cutting plan. A room one and a half tiles wide wastes more than the same area in a wider room, and only the wastage box can carry that judgement.
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About 26 tiles bare, and 29 once ten per cent wastage is added. 100 square feet is 9.29 square metres, and a 600 mm tile with a 2 mm grout line covers 0.3624 square metres. At four tiles a box that is eight boxes, with three tiles left over.
Five per cent covers a plain rectangular room laid square. Ten per cent is the usual advice and suits most rooms. Fifteen or more is realistic for a diagonal lay, a strong pattern, or a floor broken up by pillars and alcoves where nearly every edge tile has to be cut.
Yes, slightly, and always downwards. A 2 mm joint on a 600 mm tile adds 0.66 per cent to the area each tile covers, so a large floor needs a tile or two fewer than the naive division suggests. On small tiles with a 3 mm joint the effect is several times larger.
Four is normal for 600 x 600, three for 800 x 800, and eight or ten for small wall tiles, but the count belongs to the manufacturer rather than to the size. Read the carton and type the number into the box field; the page then shows how many spare tiles the last box leaves.
Yes. Enter the wall height and width instead of the room dimensions, or switch to the area option and type the surface directly. Oblong sizes such as 300 x 600 are handled the same way, and a 3 mm joint is worth setting for ceramic wall tiles.
Most tilers advise keeping one, because a batch fired next year will not match today's shade exactly and a cracked tile two winters from now needs a replacement that looks right. The spare-tile figure on this page shows how much of the last box is already going that way.
Formula only: no rates or limits are read from an official source.
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