How many 18" tiles for a 20×20 room?

196 tiles (20 boxes). Room area with 10% waste: 440 sq ft. Tile size: 18"×18". 10 tiles per box

Answer

196 tiles (20 boxes)

Room area with 10% waste: 440 sq ftTile size: 18"×18"10 tiles per box

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How We Calculated This

Tiles = ceil((L × W × 1.10) / tile area)

Area = 20 × 20 = 400 sq ft. With 10% waste = 440 sq ft. Each 18" tile = 2.25 sq ft. Tiles = 196.

Calculated using verified formulas. Last updated March 2026.