Tile Calculator
Floors & backsplashes
Plan your floor, wall or backsplash project with this free tile calculator. Enter your room dimensions and tile size to get the exact number of tiles, boxes and total cost — with a waste factor included for cuts and breakage.
Formula
Tiles = ⌈(floor area ÷ tile area) × (1 + waste%)⌉. Boxes = ⌈tiles ÷ per box⌉.
Frequently asked questions
▸How much extra tile should I buy?
Add 10% for straight layouts and 15–20% for diagonal patterns.
▸Are partial tiles counted?
Yes — totals round up so you have enough tiles for cuts.
Example calculations
A 48 ft² bathroom needs 48 tiles plus 10% waste = 53 tiles, or 6 boxes if a box holds 10 tiles.
A 15 ft² subway tile backsplash takes about 121 tiles with 15% waste for diagonal cuts around outlets.
A 224 ft² floor needs 56 large-format tiles plus 10% waste = 62 tiles, typically 11 boxes.
Tile Calculator FAQ
▸How many tiles do I need per square foot?
12×12 in tiles cover 1 ft² each; 6×6 in cover 0.25 ft². Divide your floor area by the area of one tile.
▸How much extra tile should I order?
Add 10% for straight layouts, 15% for diagonal patterns and 20% for herringbone or complex patterns.
▸How much grout do I need?
Grout coverage depends on tile size and joint width. As a rule of thumb, one 25 lb bag covers about 100 ft² of standard 12×12 in tile with 1/8 in joints.
▸Should I round up partial tiles?
Always. Cut tiles can't be re-used in most cases, and rounding up protects you from running short mid-job.