How to Calculate Tile & Wallpaper Quantity
Buying too much wastes money, while buying too little means a frustrating reorder โ especially when a dye lot is discontinued. This calculator factors in installation waste so you can order confidently.
The waste rate covers cuts at edges and breakage during installation. For regular rectangular rooms, 5โ10% is sufficient. For complex layouts, herringbone patterns, or diagonal designs, use 10โ15%.
Formula: Quantity = Ceiling(Area ร (1 + Waste%) รท Unit Area). The result is always rounded up to the nearest whole unit, giving you the minimum safe order quantity.
Frequently Asked Questions
A standard American double roll covers about 56 sq ft. Single rolls cover roughly 28 sq ft. European rolls differ, so always check the product label before ordering.
Yes โ order at least 10% more for repairs and dye-lot matching. Patterned wallpaper may need more extra to align the repeat properly at each seam.
Use 10% for simple grid layouts and 15% for diagonal or herringbone patterns. Always save a few extra tiles for future repairs once the product is discontinued.