Drop ceiling calculator

12 by 12 room, 2 by 4 tiles: 18 tiles.

Job sheet

Plumb drop ceiling job sheet

4 by 2 ft tiles.

  • Tiles183 by 6. Each edge tile counts whole.
  • Wall angle48 ft
Plumb drop ceiling job sheet
4 by 2 ft tiles.

Tiles: 18 (3 by 6. Each edge tile counts whole.)
Wall angle: 48 ft

Tiles and wall angle

Tiles are the length divided by the tile, rounded up, times the width divided by the tile, rounded up. Main tees and cross tees still follow the manufacturer’s layout drawing. This count is the tiles and the wall molding. Joists above the grid are joists. Drywall on a flat ceiling is drywall.

FAQ

How many 2 by 4 tiles in a 12 by 12 room?

Twelve divided by 4 is 3. Twelve divided by 2 is 6. That is 18 tiles, and 18 times 8 square feet is the whole ceiling. Wall angle is 48 feet.

Why not divide the area by 8?

A 10 by 10 room is 100 square feet, which looks like 13 tiles of 8 square feet. The grid is 3 by 5, which is 15 tiles, because the cut at each wall still comes out of a full tile.

Sources

  1. Armstrong Ceilings, installation basics: Grid layout counts full tiles at the borders. A 2 by 4 foot tile is 8 square feet only when the room divides evenly.