Tile measuring guide & FAQs
How to measure floor tile square footage
Measure the maximum usable width and length of each rectangular portion of the room in feet. Multiply the two numbers for square feet. For an L-shaped kitchen, divide the layout into rectangles without overlap and add their areas. Estimate vents and fixed openings carefully; small obstructions often require cuts rather than reducing overall tile orders.
Floor tile quantity example
A 12-by-10-foot kitchen is 120 square feet. With 10% added for cuts and breakage, the planned tile area becomes 132 square feet. If the chosen tile package covers 15 square feet per box, round 132 ÷ 15 up to nine boxes. Confirm the actual box coverage on the product label.
Do not confuse nominal tile size with box coverage
Tile sizes such as 12 × 24 inches are often nominal; grout joints and exact manufacturing dimensions affect physical layout. This estimator uses tile face size for an approximate piece count and printed box coverage for the order quantity. It does not simulate a tile-by-tile cutting pattern or replace a dry layout.
Frequently asked questions
How much extra floor tile should I buy?
A 10% starting allowance is common for straightforward projects. More complex cuts, diagonal installations or fragile material may require a higher allowance. Confirm with your installer.
Can I calculate an L-shaped room?
Yes. Divide the floor into non-overlapping rectangles and select Add another area. Their measured areas are combined automatically.
How accurate is this tile calculator?
The measured area and box rounding follow explicit formulas. Tile cuts, uneven walls, product sizes, coverage labels and installation methods can change the actual amount needed, so use the result as a purchase-planning estimate.
Method & sources: The formulas are documented in our methodology. Reference guidance: Home Depot — how to lay tile and backsplash measurements. Retail guidance is informational, not a partnership or endorsement. Updated Nov 3, 2026.