Paint Calculator
Estimate paint for one room or a whole house. Measure by room dimensions or direct wall area, subtract doors and windows, include ceilings, and see gallons, quarts, and cost instantly.
Rooms
Add each room, switch between dimensions or direct wall area, and include ceilings if needed.
Subtracts 20 sq ft each.
Subtracts 15 sq ft each.
Total area
0.0 sq ft
Paintable area
0.0 sq ft
Openings removed
20.0 sq ft
Room
Room 1
Paint Estimate
Total wall area
0.0 sq ft
Paintable area
0.0 sq ft
Gallons needed
0.00 gal
Quarts needed
0.0 qt
Estimated paint cost
$0.00
Assumptions
2 coats at 350 sq ft per gallon.
How to Use
- Add one or more rooms and choose whether to calculate from dimensions or direct wall area.
- Enter room measurements or total square footage, then adjust doors, windows, and the ceiling option.
- Set your number of coats, coverage per gallon, and paint price per gallon.
- Review total wall area, paintable area, gallons needed, quarts needed, and your estimated cost.
Frequently Asked Questions
How many square feet does a gallon of paint cover?
A typical gallon of interior paint covers about 350 to 400 square feet per coat, depending on the paint type, surface texture, and how much the wall absorbs.
Should I include doors and windows in my paint estimate?
Yes. Subtracting doors and windows gives a more accurate estimate, especially across multiple rooms. A common rule of thumb is about 20 square feet per door and 15 square feet per window.
Do I need two coats of paint?
Usually yes. Two coats are common for color changes, new drywall, patchy surfaces, or when you want an even finish. One coat may be enough for touch-ups or when using high-hide paint over a similar color.
How do I estimate ceiling paint?
Ceiling area is usually length × width for each room. If you plan to paint the ceiling, include that area in addition to the wall area.