One of the steps in maintaining your home as summer approaches is repainting. After enduring storms during the rainy season and facing harsh sunlight in winter, the paint on your house may fade. You can either paint your house yourself or hire a skilled painter. Regardless of whether you choose to do it yourself or hire a professional, one important thing to know is how to calculate the amount of paint needed. This ensures you buy the right amount of paint, saving time and preventing unnecessary expenses.

• Standard Labor Costs for Painters

Understanding Available Paint Quantities in the Market

Whether you buy pre-mixed paint in a gallon can or choose a custom mix from a paint mixing machine available at paint centers, the paint will come in specific quantities measured in gallons (1 gallon = 3.785 liters). The available sizes are:

1/4 gallon = 0.946 liters

1 gallon = 3.785 liters

2.5 gallons = 9.46 liters

5 gallons = 18.925 liters

Now that you know the available paint quantities, let's look at how to calculate the area in your home that needs painting. It's essential for homeowners to know the exact measurements before purchasing paint at a hardware store.

How to Calculate the Area for Painting

1 | Calculate the total area of the four walls of the room using the simple formula: 2 (Width + Length) x Height

Example

Room dimensions: Width 5 meters, Length 7 meters, Height 2.6 meters

Calculation: 2 (5 + 7) x 2.6 =  62.4 square meters

2 | Subtract the area of doors and windows using the formula: Width x Height

Example

Door dimensions: Width 1.2 x Height 2.2 = 2.64 square meters

Window dimensions: Width 2.0 x Height 0.8 = 1.6 square meters

Calculation: 62.4 - 4.24 =  58.16

3 | Once you have the area to be painted, use the following calculation to determine the amount of paint needed:

Your home's area ÷ Coverage per square meter of paint (as specified on the packaging)

Example

Using 1/4 gallon paint with a coverage of 9 sqm per application:

58.16  ÷ 9 =  6.46 liters

Convert liters to gallons: 6.46 ÷ 3.785 = 1.7

This means you will need a total of 1.7 gallons of paint.

After determining the amount of paint needed, compare this number with the sizes available in the market. In this example, you would need 2 cans of 1 gallon each.

Also, remember that to achieve quality results, you should apply a total of 3 coats: 1 primer coat and 2 finish coats to ensure the paint adheres well and lasts longer. Therefore, multiply the amount of paint needed by 3.

Source: JOMM YB

Image: Home and Garden Archive

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