Tile Calculator
Enter the area and tile size to see how many tiles and boxes you need, including waste for cuts.
Results are estimates for planning only. Always confirm measurements, local codes and manufacturer specs before ordering materials or quoting a job. See our Terms.
How to calculate tile
Area (sq ft) x 144 / (tile width x tile length in inches) = tiles needed. Add 10% waste for straight layouts and 15 to 20% for diagonal, herringbone or large-format tile with many cuts.
Buy an extra box and keep it: matching tile can be impossible to find later.
Questions
How many 12x24 tiles do I need for 100 sq ft?
Each 12x24 tile covers 2 sq ft, so 50 tiles, or 55 with 10% waste.
How much waste should I add for tile?
10% for simple straight layouts, 15% for diagonal, and up to 20% for herringbone or rooms with many cuts.
Does grout line size change the tile count?
Slightly, but for most jobs the waste factor covers it. Grout lines are usually 1/16 to 1/4 inch.