Shower Tile Calculator

Shower tile estimation involves calculating the total surface area of all walls and the floor, accounting for the tile size, grout joints, and a waste factor for cuts. Accurate estimation prevents mid-project shortages (which can mean discontinued tile colors) and avoids expensive excess.

Core formula: Total Area = (Wall Area + Floor Area) × Waste Factor Tiles Needed = Total Area / Area per Tile Total Cost = Tiles Needed × Price per Tile

What each variable means:

• Wall Area — sum of height × width for each shower wall to be tiled
• Floor Area — width × depth of the shower floor (usually a pan or curbed area)
• Waste Factor — typically 1.10 (10% extra) for straight-lay patterns; 1.15–1.20 (15–20%) for diagonal or complex patterns; 1.05 for large-format tiles with fewer cuts
• Area per Tile — tile width × tile height (in the same units as your area measurement)
• Grout Joint Width — typically 1/16" for rectified tiles, 1/8"–3/16" for standard tiles; affects how many tiles fit per square foot

Worked example: Shower: 36" × 36" floor, three walls each 36" wide × 84" tall. Using 4" × 12" subway tiles with a 10% waste factor.

Floor area: 36" × 36" = 1,296 in² = 9 ft² Wall area: 3 walls × (36" × 84") = 3 × 3,024 = 9,072 in² = 63 ft² Total area = 9 + 63 = 72 ft² With 10% waste: 72 × 1.10 = 79.2 ft² (round up to 80 ft²)

Tile size: 4" × 12" = 0.333 ft² Tiles needed: 80 / 0.333 = 240 tiles (round up to nearest box)

At $2.50 per tile: Cost = 240 × $2.50 = $600

Planning tips:

• Order full boxes, not individual tiles — most suppliers sell in boxes of 10–20 tiles
• Buy all tiles from the same dye lot — colors vary between production runs
• Add 1 extra box as a repair reserve (discontinued tiles are very common)
• Niche/built-in shelves require additional tile and cut planning — add 5% extra per niche