Tile & Grout Calculator
Estimate total tile piece count, box requirements, waste margin cuts, and pounds of powdered grout for floors and shower walls.
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Tested hardware and components for high reliability
How to Calculate Tile and Grout Quantities
Accurate tile ordering prevents running short mid-job when dye lots may no longer match. A baseline 10% to 15% waste margin covers perimeter cuts, niche cutouts, and accidental breakage.
Grout Coverage Formula
Grout (lbs) ≈ Area(sq ft) × [(L + W) / (L × W)] × Joint Width × Depth × Density Constant
Sanded vs. Unsanded Grout
As a rule of thumb, use unsanded grout for narrow joints (1/8" or smaller) and polished marble/glass that scratches easily. Use sanded grout for joints wider than 1/8" to prevent shrinkage cracking.
Frequently Asked Questions
Why should I buy extra tile boxes for attic stock?
Ceramic and porcelain tile dye lots vary between manufacturing runs. Keeping 1 full box of leftover tile ensures you have exact matching replacements if a tile cracks or plumbing repairs are needed years later.
How much more tile does a herringbone pattern require?
Herringbone and 45-degree diagonal layouts generate significantly more triangular off-cuts along room perimeters. Increase your waste allowance from 10% to 15% or 20%.
How long should grout cure before sealing?
Standard cementitious grout requires 48 to 72 hours of full curing before applying penetrating sealers to prevent locking in excess moisture.