How many square feet do 20 12×12 tiles cover?
Twenty 12×12-inch tiles cover 20 square feet of face area. Each 12×12 tile is 1 square foot, so 20 tiles × 1 square foot = 20 square feet.
Check my exact project →20 tiles × 1 square foot each = 20 square feet
A 12-inch by 12-inch tile measures 144 square inches. One square foot is also 144 square inches, so each tile represents exactly 1 square foot before grout joints, cuts or breakage.
Tiles
Twenty full 12×12-inch tiles.
Square foot per tile
12 inches × 12 inches = 144 square inches.
Square feet total
Face-area coverage before layout losses.
20 square feet of tile does not always mean a 20-square-foot project is safe
Edge cuts, broken pieces, centered layouts, patterns, unusable scraps and a spare-tile reserve can all increase the number of tiles you need. A 4 × 5 foot rectangle is exactly 20 square feet, but having exactly 20 tiles leaves no margin for those realities.
Enter the actual project dimensions in the leftover tile calculator. If these are saved tiles from an older project, keeping one or more matching pieces for future repairs may also be worthwhile.