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Ceiling Tile Calculator

Updated How we build and test

Enter the size of the room and the tile size. The calculator counts the ceiling tiles, including the cut tiles around the edges, and estimates the main beams, cross tees and wall angle for a standard suspended grid.

Main beams run along this side.

%

For breakage and future repairs.

$

Ceiling tiles

Enter the room size to see the tiles and grid parts.

How a suspended ceiling grid is laid out

Armstrong’s installation guide places the main beams on 4 ft centers. Cross tees 4 ft long clip between the mains every 2 ft to make a 2 × 4 grid; for 2 × 2 tiles, 2 ft cross tees split each opening again. Wall angle (also called wall molding) runs around the whole room to carry the edge of the grid.

Formulas

Tiles = (length ÷ tile length, rounded up) × (width ÷ tile width, rounded up) × (1 + extra %)
Rows of main beams = width ÷ 4, rounded up, minus 1
Main beams = rows × (length ÷ 12, rounded up)
4 ft cross tees ≈ area ÷ 8  (2 ft tees for 2 × 2 tiles ≈ area ÷ 8)
Wall angle pieces = perimeter ÷ 12, rounded up

Worked example: a 20 × 12 ft basement room, 2 × 4 tiles

  1. Tiles: 20 ÷ 4 = 5 across × 12 ÷ 2 = 6 rows = 30 tiles, plus 5% = 32 tiles.
  2. Main beam rows: 12 ÷ 4 = 3, minus 1 = 2 rows, each 20 ft long, so 4 beams of 12 ft.
  3. 4 ft cross tees: 240 ÷ 8 = 30.
  4. Wall angle: perimeter 64 ft ÷ 12 = 6 pieces.

Plan the borders

Center the grid so the cut tiles on opposite walls are the same width, and avoid border tiles narrower than half a tile. Laying out the room on graph paper first shows where the main beams fall and whether you need an extra row. The counts here are estimates for a plain rectangle; add parts for soffits, light fixtures and columns.

Questions

How many ceiling tiles do I need for a 12 × 12 room?

19 tiles of 2 × 4 ft or 38 tiles of 2 × 2 ft, including 5% extra.

Which way should the main beams run?

Usually perpendicular to the ceiling joists so they can be hung from them. Enter that direction as the room length.

Are 2 × 2 tiles more expensive to install?

They need twice as many cross tees, but many people prefer the look.

Sources

  1. How To Install Your Armstrong Suspended Ceiling Panels, Armstrong (hosted by HD Supply).
    Used for: Main beams on 4 ft centers; 4 ft and 2 ft cross tees for 2 × 4 and 2 × 2 panels.
  2. NIST Guide to the SI, Appendix B.8: Factors for units listed alphabetically, National Institute of Standards and Technology.
    Used for: Exact foot definitions.

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