An area estimate is the start of a tile layout
Enter the tile's actual dimensions and the planned grout joint. The tool estimates how much floor area each repeating tile-and-joint module occupies. Edge cuts, pattern alignment, damaged pieces and tiles sold by the box still need a layout check.
A 10-by-10 floor
For 12-inch-square tile with a quarter-inch joint, the repeating module is (12.25 ÷ 12)² = approximately 1.0421 square feet. A 100-square-foot floor with 10% extra gives 110 ÷ 1.0421 = approximately 105.56 tiles, rounded to 106.
This is not a cutting plan: including grout in the module is an approximation around room edges. Draw the rows and columns, consider whether offcuts can be reused, and round to the retailer's box quantity after checking that layout.
Adding bathroom walls
A worked 10-by-10 bathroom with 8-foot walls has 320 square feet of gross wall area. Adding the 100-square-foot floor and subtracting a hypothetical 35 square feet of openings gives 385. With 10% extra, that is 423.5 square feet. The same module estimate rounds to 407 tiles. Calculate walls and floors separately if the materials or patterns differ.
Mortar has its own coverage
At the tool's selected 60-square-foot-per-bag planning coverage, the floor example rounds to two mortar bags and the combined floor-and-wall example to eight. Coverage depends on the selected mortar, trowel, substrate and application. Confirm product suitability and required contact coverage from the current instructions; tile length alone does not choose the complete installation system.
Compare a complete tiled-floor budget
Add tile boxes, appropriate mortar, grout, substrate preparation, waterproofing where required, transitions, movement-joint materials, cutting consumables and delivery. The mortar subtotal is not the total price of a tiled room.
Use the grout calculator for the tile thickness and joint width you select. Record manufacturer, collection, finish, size, shade and batch information before ordering additional boxes.