How to use the drop ceiling tile calculator
- Enter the room length and width in feet.
- Choose the tile size and, for 2 by 4 foot tiles, which way the long side runs.
- Set the extra for cuts and damage. The 10% shown is an example.
- Open More options to enter the lengths of grid runner and wall angle you can buy, then read the tiles, wall angle and grid runners.
Formula
tiles along the length = room length / tile length, rounded up
tiles across the width = room width / tile width, rounded up
tiles = tiles along x tiles across
interior grid = (rows - 1) x room length + (columns - 1) x room width
wall angle = 2 x (room length + room width)
The border tiles are the size left over. If you center the grid, the border at each end is half the remainder.
A 14 by 11 foot room with 2 by 4 foot tiles
With the long side along the 14 foot length, you need 14 / 4 = 3.5, so 4 tiles along the length, and 11 / 2 = 5.5, so 6 across. That is 24 tiles, or 27 with 10% extra. The wall angle is 2 x (14 + 11) = 50 feet, which is 5 pieces of 10 feet. The grid has 5 lines of 14 feet and 3 lines of 11 feet, which is 103 feet inside the room.
Centered, the border tiles are 12 inches at each end of the length and 6 inches at each side. Turning the long side along the width gives 7 by 3 tiles, 21 in all, with 94 feet of interior grid. A 12 by 10 foot room with 2 by 2 foot tiles needs 6 by 5, which is 30 tiles and 98 feet of interior grid.
Centering the layout
If you start the grid at one wall, the cut tiles end up on the far wall and look uneven. Centering puts a border of equal width on each side. If the border comes out narrower than a few inches, shift the grid by half a tile so the borders are both wider.
The page shows the border width for a centered layout so you can decide before you hang the first runner.
What this count leaves out
The count assumes one tile for every cell of the grid, including partial border cells, and measures every grid line as the full room length. Real grids use main runners, cross tees and connectors in particular lengths, and light fixtures replace tiles. Hanger wire, screws and the clearance above the ceiling are not included.
Related ceiling and wall tools
Use the Tile Calculator for floors and walls, the Drywall Calculator for a solid ceiling, the Baseboard Trim Calculator for trim, and the Insulation Calculator for the space above.
Assumptions and limits
- The room is a rectangle and the grid is a straight pattern of equal cells.
- Each partial border cell uses one whole tile.
- Runner and wall angle lengths are examples until you enter the lengths you can buy.
- The page does not know your ceiling height, fixtures or the product system you choose.
Frequently asked questions
How many ceiling tiles do I need?
Divide each room dimension by the tile dimension, round each up and multiply. A 14 by 11 foot room with 2 by 4 foot tiles needs 4 by 6, or 24 tiles, plus extra for cuts.
How much wall angle do I need?
Wall angle runs around the whole room, so it is twice the sum of the length and width. A 14 by 11 foot room needs 50 feet, which is 5 pieces of 10 feet.
Should I center the grid?
Centering gives equal border tiles on opposite walls and usually looks best. The page shows the border width so you can check that it is not too narrow to cut.
How do I allow for light fixtures?
A fixture replaces a tile, so the count stays the same unless the fixture needs a cut tile. Count the tiles in the plan and add extras for the cut openings.