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Omnikalc

Suspended ceiling calculator

Count the ceiling tiles, main tees, cross tees, wall angle and hanger wires for a suspended grid ceiling in a rectangular room.

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Results

Ceiling tiles

32

Main tees (12 ft)

2

Cross tees (4 ft)
15
Cross tees (2 ft)
18
Wall angle (10 ft pieces)
5
Hanger wires (every 4 ft along main tees)
8
Materials cost
$328

A suspended or drop ceiling hides pipes and wiring, absorbs sound and is easy to open for repairs. It is built from a metal grid hung from the structure above, with lay-in tiles. This calculator counts the tiles and the grid parts for a rectangular room.

The parts of the grid

  • Wall angle: L-shaped molding fixed around the walls, usually in 10 ft or 12 ft lengths.
  • Main tees (mains or runners): 12 ft long, spaced 4 ft apart, running across the joists and hung with wire.
  • 4 ft cross tees: clipped between the main tees every 2 ft, making 2 × 4 ft openings.
  • 2 ft cross tees: clipped across the middle of each 2 × 4 opening to make 2 × 2 ft openings.
  • Hanger wires: 12-gauge wire every 4 ft along each main tee, tied to screw eyes or anchors above.

How the calculation works

  • Tiles = (length ÷ 2 ft, rounded up) × (width ÷ tile width, rounded up), plus spares
  • Rows of main tees = width ÷ 4 ft, rounded up, minus 1
  • Main tees = rows × (length ÷ 12 ft, rounded up)
  • 4 ft cross tees = (rows + 1) × (length ÷ 2 ft − 1)
  • 2 ft cross tees = (rows + 1) × length ÷ 2 ft, for 2 × 2 tiles
  • Wall angle = perimeter ÷ 10 ft, rounded up

Example

A 12 × 10 ft room with 2 × 2 ft tiles needs 30 tiles (32 with 5% spares), 2 rows of main tees (2 mains of 12 ft), 15 cross tees of 4 ft, 18 of 2 ft and 5 lengths of wall angle. It also takes about 8 hanger wires.

Layout tips

  • Center the grid so the border tiles on opposite walls are the same size, and at least half a tile wide. Measure the room, divide by the tile size and split the remainder between the two sides.
  • Leave at least 3 in between the grid and the lowest pipe or duct, and 4 to 6 in if you will add recessed lights.
  • Check local code: in many places the ceiling height of a habitable room must stay at least 7 ft after the grid is installed.
  • Use a laser level or a water level to set the wall angle at the same height around the room.
  • Moisture-resistant tiles are best in basements; fire-rated tiles and grid may be required over some spaces.

The calculator gives quantities for a simple rectangle; add parts for closets, bulkheads and light fixtures.

Frequently asked questions

How far apart are main tees in a drop ceiling?

4 feet apart, with hanger wires every 4 feet along each main tee.

How many ceiling tiles do I need?

Divide the length and width by the tile size, round each up and multiply, then add about 5% spares.

How much space above a drop ceiling?

At least 3 inches below the lowest obstruction, and more for recessed lights.

Should I use 2 × 2 or 2 × 4 tiles?

2 × 2 tiles look more finished; 2 × 4 tiles need fewer tees and cost less.

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Results are estimates provided for information purposes. They do not replace professional advice.

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