Tile Calculator
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How the Tile Estimate Is Calculated
This calculator uses the standard area-based tile takeoff method used by flooring installers: divide the room's total square footage by the coverage area of a single tile to get a baseline tile count, then add a waste allowance to cover cuts, breakage, and pattern matching. Room area is length × width, and each tile's coverage is converted from inches to square feet (tile length × tile width ÷ 144) so both figures share the same unit before dividing.
Why a Waste Allowance Is Standard Practice
A 10% waste allowance is the widely used industry default for simple, rectangular layouts with tiles laid straight (grid pattern). It accounts for tiles cut to fit at walls and around fixtures, occasional breakage, and a few spares for future repairs. Diagonal layouts, herringbone or other complex patterns, rooms with lots of corners/alcoves, or large-format tile typically call for 15-20% instead, since more of each tile ends up as unusable offcut. This tool lets you override the default so you can match it to your actual layout.
Boxes, Not Just Tiles
Tile is sold by the box, not individually, so the number that actually matters at checkout is boxes needed, rounded up — buying a partial box doesn't get you a partial-box price. Enter how many tiles come in a box and this calculator rounds the box count up automatically; leave a price per box to also get a rough material cost estimate. For the room's total floor space by itself, or for other rooms in the same project, the square footage calculator can help, and if you're also planning material for a poured or slab surface nearby, see the concrete calculator.
Frequently Asked Questions
How much extra tile should I buy for waste?
10% is the standard allowance for a simple grid layout with rectangular tile. Bump it up to 15-20% if you're installing diagonally, using a herringbone or other complex pattern, tiling a room with lots of corners or alcoves, or using large-format tile, since more material ends up as unusable offcuts in those cases.
Why does the calculator round up to full boxes?
Tile is sold by the box, and stores don't sell partial boxes, so any fractional box needed still means buying a whole extra box. The calculator rounds the tiles-needed figure up to the nearest full box so the number you see is what you'd actually need to purchase.