Floor / Tile Area Calculator

Floor / Tile Area Calculator

Plan your next tiling project with confidence. Enter the room dimensions, tile size, grout gap, and wastage allowance, and the calculator returns the total floor area, exact number of tiles, the cut-tile estimate, and the precise number of boxes to take to the hardware store.

Comment utiliser

1. Pick metric or imperial units at the top.
2. Choose a room shape (rectangle or L-shape) and enter the length and width of each section.
3. Enter the tile length and width (mm in metric, inches in imperial) and the grout gap between tiles.
4. Slide the wastage percentage to match your layout: 5-10% for straight grid, 15-20% for diagonal or herringbone patterns.
5. Set the tiles per box for the product you plan to buy.
6. Read the totals: floor area, tiles needed, cut tiles, coverage from your purchase, and the number of boxes to buy.

Caractéristiques

• Rectangle and L-shape rooms – combine two rectangles for hallways, kitchens with a peninsula, or rooms with offsets.
• Grout-aware tile area – effective tile size includes the grout joint, so the calculation matches how tiles actually lay on the floor.
• Wastage slider (0-30%) – account for cuts, breakage, and a small reserve for future repairs.
• Box-level rounding – tile counts are rounded up to whole boxes, with the coverage and leftover tiles displayed.
• Metric / imperial toggle – swap between m and ft for rooms, and mm and inches for tile and grout.
• Hardware-store summary – a single sentence with floor area, tile count, and box count, ready to copy or screenshot.

Choosing the Right Wastage Percentage

Wastage covers the tiles you lose to perimeter cuts, mistakes, and future repairs. A straight grid layout in a simple rectangular room usually needs 5-10%. Diagonal layouts and herringbone or brick-bond patterns produce more triangular off-cuts and typically need 15-20%. Large tiles, intricate room shapes, and inexperienced installers all push the number higher. Adding two or three spare tiles on top of your buffer is a cheap insurance policy when the same tile batch may be discontinued by the time you need a replacement.

Why the Grout Gap Matters

Each tile in a grid layout occupies a cell that is the tile plus one grout joint on two sides. With small tiles and a 3-5 mm grout line the effect is significant: a 100 x 100 mm tile with a 5 mm joint actually covers a 105 x 105 mm cell, so the tile count is about 10% lower than naive floor-divided-by-tile math suggests. With large format tiles and a 2 mm joint the effect is smaller, but it still moves the count by a few tiles per room. The calculator builds the grout gap directly into the effective tile area, so the result mirrors how the tiles really sit on the floor.