The Locolory toolkit / Flooring & Tile Setting
Estimate tile count, box requirements, cut-waste allowances, and dry grout weight for floors, backsplashes, and shower walls.
How much tile and grout do I need? Divide installation area by one tile's area and add a layout waste allowance—often 10% for straight patterns and 15% to 20% for diagonal or herringbone work—then estimate grout from tile dimensions, thickness, and joint width.
Zero network transmissions. Client-side execution.
Net area
100.0 ft² / 9.3 m²
With waste
110.0 ft²
Tiles
55
Full boxes
7
Dry grout
4.9 lb
25-lb bags
1
Straight layouts usually reuse offcuts more efficiently. Diagonal and herringbone layouts create repeated angled perimeter cuts, while large-format tile can produce sizable unusable pieces.
Waste is a planning allowance, not a guarantee. Add attic stock for repairs and confirm shade, caliber, and dye lot before installation.
This tool uses MAPEI's dimensional formula with a 1.6 density factor: (length + width) ÷ (length × width) × thickness × joint width.
Grout chemistry and density vary. Actual coverage also changes with tile edge profile, joint depth, waste, application, and cleanup. Confirm the selected product's coverage chart.
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Ten percent is a common starting allowance for straight layouts. Diagonal, herringbone, complex rooms, fragile tile, shade matching, and future repairs can justify 15–20% or more.
Grout selection depends on joint width, tile surface, location, and manufacturer instructions. Traditional unsanded grout is commonly used in narrow joints and scratch-sensitive applications, while sanded or high-performance grouts cover wider joints; product limits control.
Multiply installation area by the waste factor, then divide by the square-foot coverage printed on one carton and round up to a whole box. Verify carton coverage and dye lot before purchase.
Herringbone creates repeated angled perimeter cuts and can leave fewer reusable offcuts. Room shape, tile proportions, centering, and installer layout affect the actual waste.