Tile Calculator
How many tiles and boxes to buy for a wall or floor
How it is calculated
The area to tile is the surface length times the height, less openings. One tile with its joint takes up (length + joint) × (width + joint). The number of tiles is the area increased by the reserve and divided by the area of one tile with its joint, rounded up. Boxes are the tiles with reserve divided by the number of tiles per box, also rounded up.
For a floor, enter the length and width of the room. For several walls, add up their lengths around the perimeter and subtract doors and windows with the «Subtract openings» field.
FAQ
How much reserve should I allow?
The reserve covers cuts, breakage and defects. You set it yourself: 10% is a common choice for straight laying on large surfaces; for diagonal laying, a small room with many corners and boxings, or large-format tiles, the reserve is increased.
Why take the joint into account?
Each tile with its joint takes up slightly more than its own size, so you need a few tiles fewer than a calculation without joints suggests. With small tiles the difference is noticeable.
Why can the actual quantity differ?
The calculator works from the area. The real number depends on the layout: where the first row starts, how many cuts there are at the edges and whether offcuts can be reused. In RenoForge you can set the layout of a covering in the room, and the quantity is calculated from it.