What Is Painting | Painting Area Calculation for Evan Surface & Uneven Surface |How Much Paint Do I Need

• 12 ft. x 10 ft. = 120 ft².

Odd Area 

Sometimes you will have to account for odd area dimensions or additional areas that don’t neatly connect with your main area.

In this case, to calculate the square feet accurately, you may need to divide the space into separate areas.

For example, Assume you are trying to paint for a rectangular area with a nook. The shape is formed of a large rectangle and a smaller rectangle.

• Find the length and width of each section (labeled A and B here), then calculate each square feet:
  3 ft. x 7 ft. = 21 ft².
  12 ft. x 10 ft. = 120 ft².

• Then, add the three values together to get the total square feet you will need:
  120 ft². + 21 ft². = 141 ft².
• Therefore, you’ll need 141 ft². of flooring materials.

Also, read: What Is Zero Force Member for Truss | How to Identification of  Zero Force Members in Truss

What Is Painting?

Paint is a substance used as the final finish to all surfaces and as a coating to protect or decorate the surface.

Paint is a pigmented opaque material that completely covers and hides the surface to which it is applied. Paint is available in oil-based and water-based formulae.

Paint prevents corrosion. It is a combination of pigments with suitable thinners or oils to provide decorative and protective coatings.

It is used as a protective coating and is normally sprayed/brushed on. Painting protects a surface from weathering effects and also prevents corrosion of metals.

How Much Paint Do I Need

• One-gallon can of paint cover up to 400 square feet, which is enough to cover a small room like a bathroom.
• Two-gallon can of paint cover up to 800 square feet, which is enough to cover an average size room. This is the most common amount needed, especially when considering second coat coverage.
• Note: 1 gallon = 3.78541 liters (This consumption as per PPG Paint Company report.)

Painting Area Calculation for Evan Surface

For Example, Assume a contractor paints a room, A room that is 12 x 15 feet with a 10-feet ceiling. The room has two doors and two windows. (Door Size = 3 feet X 7 feet , Window = 5 feet X 3 feet)

Step-1 (Measure the total distance)

Measure the total distance (perimeter) around the room. (12 ft. + 15 ft.) x 2 = 54 ft.

Step-2 (Multiply the perimeter by the ceiling )

Multiply the perimeter by the ceiling height to get the total wall area: 54 ft. x 10 ft. = 540 sq. ft.

Step-3 (Door Deduction Area )

Doors are usually 21 square feet (there are two in this example): 21 sq. ft. x 2 = 42 sq. ft.

Step-4 (Window Deduction Area )

Windows average 15 square feet (there are two in this example): 15 sq. ft. x 2 = 30 sq. ft.

Step-5 (Total Area of Wall Paint)

Take the total wall area and subtract the area for the doors and windows to get the wall surface to be painted: 540 sq. ft. (wall area) – 42 sq. ft. (doors) – 30 sq. ft. (windows) = 468 sq. ft. of walls that need to be painted.

Step-6 (Total Area of Celling Paint)

Multiply the ceiling length to get the total ceiling area: 12 ft. x 15 ft. = 180 sq. ft.

Step-7 (Total Area Paint Area)

Total Paint Area = Total Paint of Wall Area + Total Paint of Ceiling Area

Total Paint Area = 468 sq. ft. + 180 sq. ft.

Total Paint Area = 648 sq. ft.

As a rule of thumb, one gallon of quality paint will usually cover 400 square feet. One quart will cover 100 square feet. Because you need to cover 648 square feet in this example, 1.62 gallons will be adequate to give one coat of paint to the walls and ceiling. (Coverage will be affected by the porosity and texture of the surface. In addition, bright colors may require a minimum of two coats.)

Also, read: IS 1200 Important Point Part-2

How to Measure Painting Area for Irregular Surface?

Unlike brickwork or any masonry calculation, calculation of painting area for joineries such as windows grills, fences, doors, fences, and shutters is a little bit tricky.

Since every item comes with different designs (Open, closed designs) and girth, we cannot measure it as a flat surface. Meanwhile, we cannot ignore the work done by contractors on these uneven surfaces.

So to compensate for the work done by the contractor, the measurement shall be taken as flat surfaces, and specific paint coefficients will be multiplied by that area.

All Painting coefficient as below as per IS Code 1200 Part 15: 1987

Paint Coefficient for Uneven Surface Area

Painting Area Calculation for Uneven Surface

For Example, Assume a contractor paints a Steel roller shutters of 12 ft. x 10 ft.

Total Painting Area = Area of Flat Surface X Painting Coefficient X Total Paint Side

Area of Flat Surface = 12 ft. x 10 ft. = 120 ft².

Painting Coefficient = 1.1 For Each Side (As per the above table- Point no -15)

Total Paint Side = 2 Side Paint

Total Painting Area = 120 ft². X 1.1 For Each Side X 2 Side Paint

Total Painting Area = 264 ft²