Calculate the number of tiles needed to cover a room, including a wastage allowance for cuts and breakage.
This tool estimates how many tiles you need to cover a floor or wall area, based on the room's dimensions and the size of each tile. It helps with budgeting materials for renovation projects and avoiding costly under-ordering or wasteful over-ordering.
Number of Tiles = (Room Area ÷ Tile Area) × (1 + Waste Factor). Room Area = Length × Width. Tile Area = Tile Length × Tile Width. A waste factor (commonly 10%) is added to account for cuts, breakage, and pattern layout.
Enter your room's length and width, and your chosen tile's dimensions, and the calculator returns the estimated number of tiles needed, including a waste allowance.
Example: A 10 ft × 10 ft room (100 sq ft) using 1 ft × 1 ft tiles needs 100 tiles at minimum; with a 10% waste factor, order approximately 110 tiles.
Why do I need extra tiles beyond the exact calculation? Extra tiles account for cutting tiles to fit edges and corners, breakage during installation, and having spares for future repairs, since matching tile batches later can be difficult.
How much waste factor should I use? A standard straight-lay pattern typically uses about 10% extra, while diagonal patterns or complex layouts with more cuts often need 15% or more.
Does grout line width affect the tile count? For most rooms, grout lines have a minor effect on the total count, but for very precise or large-format tile jobs, professionals may factor grout spacing into exact calculations.
Should I measure the room or the tile in the same unit? Yes, always use matching units (both in feet, or both in meters) for the room and tile dimensions to get an accurate result.
What if my room is an irregular shape? Break the room into rectangular sections, calculate the tile requirement for each section separately, then sum the totals together for the full project.