Tile & Grout Calculator
Estimate total tile piece count, box requirements, waste margin cuts, and pounds of powdered grout for floors and shower walls.
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.