Tile Calculator: Tiles, Grout and Thinset in One Estimate

La plupart des fournisseurs vendent le tile à la verge cube. Pour convertir la surface en verges cubes, utilisez cette formule :

Notre calculatrice multiplie également le résultat par 0 tonnes/vg³ (densité standard) pour estimer le poids.

A tile calculator converts floor area to tile count using your tile size, then adds a waste factor based on layout pattern. The base formula is: Floor Area / Tile Area x (1 + Waste Factor). For 144 sq ft with 12x12 tiles in a straight layout: 144 / 1 x 1.10 = 159 tiles. The waste factor is where most DIY estimates go wrong, because it varies dramatically by pattern.

Waste factors exist because tiles must be cut to fit edges, corners, and obstacles, and cut pieces usually cannot be reused. Straight layouts waste the least: 10% covers standard rooms. Diagonal layouts rotate every tile 45 degrees, which doubles the number of edge cuts: use 15%. Herringbone and chevron patterns are the most wasteful at 20% because nearly every perimeter tile requires two angled cuts. Rooms with L-shapes, closets, or many doorways push toward the high end of each range.

Grout calculation is the step most estimators skip, yet running out of grout mid-project is a common DIY disaster. The formula our tile calculator uses: one 25 lb bag covers 100 sq ft of 12x12 tile with standard 1/8-inch joints. Adjust for your situation: halve the coverage for 6x6 tiles (more joints per square foot), and multiply by 1.5 for 1/4-inch joints. Grout comes in 10 lb and 25 lb bags; the 25 lb bag is almost always the better value.

Thinset mortar follows similar logic with different numbers. A 50 lb bag applied with a standard 1/4 x 3/8 inch square-notch trowel covers 90 to 100 sq ft. Large format tiles (over 15 inches) require a 1/2-inch trowel and back-buttering, which drops coverage to roughly 60 sq ft per bag. Our calculator estimates thinset at 95 sq ft per bag and rounds up, with a note to add one extra bag for large format work.

Tile size selection affects both material cost and installation difficulty. Twelve-inch tiles are the sweet spot for DIY: manageable weight, standard trowels, forgiving layout. Twenty-four-inch tiles look luxurious but require a perfectly flat substrate (within 1/8 inch over 10 feet), large trowels, and back-buttering. They also break more easily during cutting. If your subfloor has any unevenness, stick with 12x12 or smaller.