How Much Paint Do I Need for a 3-Bedroom House?

Estimating the right amount of paint is crucial for any painting project. Too little, and you'll be making extra trips to the store; too much, and you waste money and resources. This guide will help you calculate the paint needed for a typical 3-bedroom house.

Step 1: Measure Your Rooms

Measure the length and width of each room you plan to paint. Also, measure the height of the walls (usually 8 feet, but measure to be sure). For each room, calculate the perimeter: (Length + Width) x 2.

Example Room 1 (Master Bedroom): 12ft long x 14ft wide. Perimeter = (12 + 14) x 2 = 52 ft.

Example Room 2 (Bedroom 2): 10ft long x 12ft wide. Perimeter = (10 + 12) x 2 = 44 ft.

Example Room 3 (Bedroom 3): 10ft long x 10ft wide. Perimeter = (10 + 10) x 2 = 40 ft.

Don't forget hallways and other common areas if you plan to paint them too!

Step 2: Calculate Wall Area

Multiply the perimeter of each room by the wall height to get the total wall area for that room.

Example Room 1: 52 ft (perimeter) x 8 ft (height) = 416 sq ft.

Example Room 2: 44 ft x 8 ft = 352 sq ft.

Example Room 3: 40 ft x 8 ft = 320 sq ft.

Total Wall Area (3 rooms): 416 + 352 + 320 = 1088 sq ft.

Step 3: Subtract Doors and Windows

Estimate the area of doors and windows you won't be painting. A standard door is about 21 sq ft, and a standard window is about 15 sq ft. Subtract this from your total wall area.

Let's assume 3 doors and 4 windows across the 3 rooms: (3 x 21) + (4 x 15) = 63 + 60 = 123 sq ft.

Paintable Wall Area: 1088 sq ft - 123 sq ft = 965 sq ft.

Step 4: Account for Coats and Paint Coverage

Most paint covers about 350-400 sq ft per gallon per coat. Check the specific coverage on your paint can. Most projects require two coats for best results.

Total Area to Cover (2 coats): 965 sq ft x 2 = 1930 sq ft.

Gallons Needed: 1930 sq ft / 375 sq ft/gallon (average) ≈ 5.15 gallons.

Conclusion

For a typical 3-bedroom house (painting only the bedrooms), you'll likely need around 5 to 6 gallons of paint for two coats. It's always wise to buy slightly more than you calculate to account for touch-ups or variations in coverage.

Tip: Use our Paint Calculator for a quick and easy estimate!