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Calcimator

Coffered Ceiling Calculator

Grid dimensions and material from ceiling size.

About this calculator

This calculator lays out a coffered ceiling grid from bay counts and ceiling dimensions. Number of coffers is simply Grid bays (length) multiplied by Grid bays (width) -- an exact product with no other input involved, so Ceiling length (ft), Ceiling width (ft), Beam depth (in), Beam width (in), Beam cost per LF ($), and Panel cost/sq ft ($) all have zero effect on the coffer count itself. Those six inputs instead determine the SIZE of each coffer and the material cost, not how many coffers exist.

Beam linear feet sums two directions: lengthwise beams (one more than the width bay count, running the ceiling's full length) plus widthwise beams (one more than the length bay count, running the full width) -- Ceiling length (ft) moves this total in direct proportion, since it multiplies against the lengthwise beam count on every increase. Coffer length and Coffer width (the interior dimensions of each recessed panel) subtract the beam material's physical footprint from the ceiling dimensions before dividing by the bay count, so a wider Beam width (in) shrinks each coffer's usable interior slightly even though it does not change how many coffers there are. Material cost combines beam cost (Beam linear feet times Beam cost per LF) and panel cost (total coffer panel area times Panel cost/sq ft) into one total.

Inputs

ft
ft
in
in

Results

Number of coffers

12

Beam linear feet124
Beam intersections20
Panel area (sq ft)152.89
Coffer length (in)43
Coffer width (in)42.7
Material cost$1,078.67
Total Beam Material (sq ft)165.33
How to Use This Calculator
  1. Enter Ceiling length (ft), Ceiling width (ft), and Grid bays (length).
  2. Set Grid bays (width), Beam depth (in), and Beam width (in).
  3. Adjust Beam cost per LF ($), Panel cost/sq ft ($) as needed.
  4. Review the Number of coffers result.
  5. Use Beam linear feet and Beam intersections to inform your decision.

What each input means

Ceiling length (ft)
Length of the ceiling area.
Ceiling width (ft)
Width of the ceiling area.
Grid bays (length)
Number of coffer bays along the length.
Grid bays (width)
Number of coffer bays along the width.
Beam depth (in)
How far beams drop below ceiling (depth of the coffer).
Beam width (in)
Face width of each beam.
Beam cost per LF ($)
Cost per linear foot of beam material.
Panel cost/sq ft ($)
Cost per square foot for recessed panel material.

What each result means

Number of coffers
Total recessed panels in the grid.
Beam linear feet
Total linear feet of beam material (both directions).
Beam intersections
Number of cross-points requiring notch or lap joints.
Panel area (sq ft)
Total area of recessed coffer panels.
Coffer length (in)
Internal length of each coffer panel.
Coffer width (in)
Internal width of each coffer panel.
Material cost
Estimated cost for beams and panels.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Ceiling length (ft) = 16, Ceiling width (ft) = 12, Grid bays (length) = 4, Grid bays (width) = 3 = 8 input(s) provided
  2. Calculate Number of coffers
    Number of coffers
    12 = 12
  3. Calculate Beam linear feet
    Beam linear feet = lengthwiseLf + widthwiseLf
    124 = 124
  4. Calculate Beam intersections
    Beam intersections
    20 = 20

Engine last updated . Checked against 2 independently-derived tests — how we verify calculators. Built by Paul Gunder, a software engineer, not a licensed financial, medical, or legal professional.

Frequently Asked Questions

Does the ceiling size change how many coffers are in the grid?

No -- Number of coffers is exactly Grid bays (length) multiplied by Grid bays (width), an integer product that never references Ceiling length (ft) or Ceiling width (ft). Ceiling dimensions determine how big each coffer panel is and how much beam material is needed, but not the count of coffers itself.

Why doesn't beam cost per linear foot affect the number of coffers?

Beam cost per LF ($) and Panel cost/sq ft ($) are pure pricing inputs -- they multiply into Material cost after the physical layout (coffer count, beam linear feet, panel area) has already been determined by the grid bay counts and ceiling dimensions. Changing the price per unit never changes how many coffers or how much beam material the layout requires.

How does beam width affect the interior coffer dimensions?

Coffer length (in) and Coffer width (in) subtract the physical footprint of all the beams in that direction (bay count plus one, times Beam width (in)) from the total ceiling dimension before dividing by the number of bays. A wider Beam width (in) leaves less usable ceiling dimension after accounting for the beams themselves, shrinking each coffer's interior size even though the total coffer count stays the same.

What does the material cost include?

Material cost sums two components: beam material (Beam linear feet, covering both the lengthwise and widthwise grid members, multiplied by Beam cost per LF ($)) and panel material (total recessed panel area multiplied by Panel cost/sq ft ($)). It does not include labor, fasteners, crown molding or trim details, or the U-channel beam construction's actual board-foot lumber cost beyond the simplified per-linear-foot rate.

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