Calculating the amount of paint needed to paint the exterior of your home involves several steps. Here’s a basic formula to help you estimate the amount of paint required:

1. Determine the Surface Area to be Painted:

• Measure the height and width of each wall to be painted.
• Multiply the height by the width of each wall to get the square footage.
• Add up the square footage of all walls to get the total surface area to be painted.

2. Adjust for Windows, Doors, and Other Obstacles:

• Subtract the square footage of windows and doors from the total surface area. Measure the height and width of each window and door, and subtract their square footage from the total.
• Subtract the square footage of other obstacles, such as shutters, trim, or any other areas that won’t be painted.

3. Determine the Paint Coverage:

• Check the label on the paint can for the coverage rate. This is usually given in square feet per gallon (e.g., 300 sq. ft. per gallon).
• Divide the total surface area to be painted by the coverage rate to determine the total gallons of paint needed.

4. Account for Multiple Coats:

• If you plan to apply more than one coat of paint, multiply the total gallons needed by the number of coats.

5. Consider the Paint Type and Surface Condition:

• Different paint types may have different coverage rates, so adjust your calculations accordingly.
• If the surface is rough or porous, you may need more paint to achieve full coverage.

6. Round Up:

• It’s a good idea to round up to the nearest gallon to ensure you have enough paint for touch-ups and to account for any waste.

Example Calculation:

• Total surface area: 2,000 sq. ft.
• Paint coverage rate: 300 sq. ft. per gallon
• Number of coats: 2
• Total gallons needed = (2,000 sq. ft. / 300 sq. ft. per gallon) x 2 coats = 13.3 gallons (round up to 14 gallons)

Keep in mind that this is a basic formula and actual paint requirements may vary based on factors such as surface porosity, paint color, and application method. It’s always a good idea to consult with a paint professional or use a paint calculator for a more accurate estimate.