Calculate how many tiles you need for floors, walls, or backsplashes with grout spacing and waste factor.
How to Use This Tile Calculator
Enter the area dimensions and tile size with grout width. The calculator estimates tiles needed, grout, and thin-set mortar, including waste.
Formula & How It Works
Tile coverage = tile width × tile height. Tiles needed = Area / (Tile coverage + grout lines) × Waste Factor (1.10 for straight, 1.15 for diagonal).
Calculation Example
Bathroom floor 8×10 ft = 80 sq ft. Using 12×12" tiles with 1/8" grout: 80 tiles + 10% waste = 88 tiles. Thin-set: ~25 lbs per 25 sq ft, grout: ~10 lbs.
Expert Tips
Buy 10-15% extra tiles and keep leftovers for future repairs (matching tiles later is nearly impossible). Larger tiles make small rooms look bigger. Use a laser level for your first row — it sets the alignment for everything.