Need to know how much paint to buy for a 20x20-foot room? At 400 square feet of floor area, this is a large-sized room. Our pre-calculated estimates below show exactly how many gallons you need for two coats of standard paint, with deductions for two doors and 3 windows.
Advertisement
Paint Needed
4
gallons
This covers 553 square feet with 2 coats of standard paint.
Flat or eggshell finish recommended for bedrooms. Low-VOC paint is ideal for better air quality.
Based on a 20x20 ft room with 8-ft ceilings, 2 door(s), and 3 window(s). Paint at 400 sq ft/gallon with 15% waste buffer.
Everything you need to get professional results.
Quality rollers, brushes, tape, and drop cloths for a professional finish.
Shop SuppliesTop-rated interior and exterior paints for lasting, beautiful results.
Browse PaintSave time on big projects with an electric or airless paint sprayer.
View SprayersProduct links go to Amazon.com
A 20x20 room with 8-foot ceilings has approximately 640 square feet of wall area before deductions. After accounting for two doors and 3 windows, you will typically need about 4 gallons for two coats of standard paint.
A 20x20 room with standard 8-foot ceilings has 640 square feet of total wall area. After subtracting for doors and windows (typically 87 sq ft), the net paintable area is about 553 square feet.
A 20x20 room with 8-foot ceilings needs about 4 gallons for two coats of standard paint. This is after deducting for two doors and three windows. Consider buying a 5-gallon bucket for better value.
Advertisement
Calculate exactly how much paint you need for a 16x20 foot room. Get accurate ga...
Calculate paint needed for your living room. Accurate gallon estimates for stand...
Calculate paint needed for your garage walls. Accurate estimates for 1-car, 2-ca...