# How to calculate gypsum design false ceilings? ## How to calculate gypsum design false ceilings?

In this post you will learn how to calculate a gypsum design false ceiling as per the design you see in the image above. Let's say the room dimensions about 15' length and 10' breadth and having a first layer of plain false ceiling and 1.5' bottom breadth of second level cove design layer on throughout the walls with 4" drop from the first layer and a couple of rafters on the first layer having 2 wings with dimensions of 0'-2" x 0'-6" x 0'-2" x 4' (Left x Bottom x Right x Length).

Before we get in to the calculation process we should know some basic things about the false ceiling calculation method. This is not only applicable for gypsum plasterboard false ceilings; this method should be applied on any kind of multi-layer false ceilings.

### Calculation Rules

1. Less than 1' breadth of surfaces must be taken in running feet instead of square foot.
2. Each and every side of the surfaces should be treated as an individual object (i.e. every surfaces of a rafter).
3. Cut opens for light fixtures, A/C grills, diffusers, trap doors or for any other things should not be considered for deduction.
4. Only exposed surfaces should be measured (i.e. the 1st layer should measure from inner vertical to vertical, not from wall to wall).

### Calculation Process

1. 1st layer ceiling: Measure the length and breadth from inner vertical to inner vertical and multiply them (i.e. 13 x 8 = 104 sq.ft).
2. 2nd layer cove bottom: Measure the total perimeter of wall (15' + 10' + 15' + 10' = 50') and subtract the overlaps of each corners (i.e. 4 no's x 1.5' = 6') and multiply the final value (50' - 6' = 44') with the bottom breadth of second layer (i.e. 44' x 1.5' = 66 sq.ft).
3. 2nd layer cove verticals: Measure total length of inner (13' + 8' + 13' + 8' = 42') and outer vertical (12' + 7' + 12' + 7' = 38') separately and add them both (i.e. 42' + 38' = 80 ft).
4. Surfaces of the rafters: Measure the total perimeter of a rafter with both wings, as well as the bottom length (i.e. Side (4' + 4' + 6" + 3.5' + 3.5' + 6" = 16') + Bottom (4' + 3.5' = 7.5') = 23.5') and then multiply by the total number of rafters (i.e. 23.5' x 2 = 47 ft).

### Final Calculation Value

• Total square foot: A + B = 170
• Total running feet: C + D = 127