Here is the professional approach to calculating exactly how much paint you need for your exterior project. 1. The Core Calculation: Square Footage
To be more precise, subtract standard sizes for doors (approx. 20 sq. ft.) and windows (approx. 15 sq. ft.). 2. Standard Coverage Rates how much paint to buy for exterior of house
Measure the distance around the entire base of your house. Here is the professional approach to calculating exactly
For triangular gables, multiply the width by the height and divide by two. Add this to your total. For triangular gables
The foundation of your estimate is the total paintable surface area. To find this:
Most exterior paints cover between for a single coat. However, "manufacturer math" often assumes a perfectly smooth, primed surface. Experts generally recommend using 300 sq. ft. per gallon as a safer real-world baseline. 3. The "Thirst" Factors
Your house’s specific characteristics can drastically change how much paint you actually use: How Much Paint Do I Need? - Behr