Bathroom Tile Calculator

How to calculate bathroom tile

Measure floor (L × W) and each wall to be tiled (W × tile height). Total square footage ÷ coverage per box = box count — round up. Add 10% waste for straight layouts, 15% for diagonal. Grout: at 12×12 with 3/16-in joints, figure ~0.18 lb per sq ft. Get grout in matching color from one batch to avoid lot differences.

Bathroom tile calculator FAQ

How do I calculate how much tile I need for a bathroom?

Measure the floor area (length × width) and each wall area to be tiled (width × tile height). Add them together for total square footage. Add 10% waste for straight layouts, 15% for diagonal, and 20% for small or intricate patterns. Divide by the coverage per box to get box count.

How much tile do I need for a standard shower?

A typical 36×36-inch shower stall has about 60 to 80 square feet of tileable wall surface (three walls, floor-to-ceiling). A 60×36 shower adds another 20 square feet. Always measure your actual opening dimensions rather than relying on standard sizes, and add 10 to 15% waste.

Do I need special tile for bathroom floors vs walls?

Floor tile must be rated for floor use with a slip-resistance coefficient of at least 0.60 (wet). Many wall tiles are too slippery for floors and may be too thin for foot traffic. Look for the PEI rating: PEI 2–3 for residential bathroom floors, PEI 4–5 for heavy traffic. Wall tile can be any PEI rating.

How much grout do I need for bathroom tile?

Grout quantity depends on tile size and joint width. A 12×12 tile with 3/16-inch joints uses roughly 0.18 lb of grout per square foot. A 4×4 tile with the same joint uses more (about 0.5 lb/sq ft) because smaller tiles have more total joint length. Use a grout calculator for the exact amount.