Paint Calculator
Calculate how much paint and primer you need for any room or surface.
Inputs
Total Area
0 sq ft
Gallons Needed
0
Estimated Cost
$0
How to Use This Paint Calculator
Our free paint calculator tells you exactly how many gallons of paint and primer you need for any room. Enter your room dimensions, doors, windows, and paint details for an instant estimate with cost breakdown.
A gallon of quality interior paint typically covers 350-400 square feet per coat. Our calculator accounts for your specific coverage rate and number of coats to give you a precise estimate.
Pro tip: Always buy slightly more paint than calculated. Most painters recommend rounding up to the nearest half-gallon for touch-ups.
Related Topics
Frequently Asked Questions about Paint Calculations
How much paint do I need for a room?
A typical 12x12 room with 8-foot ceilings needs about 2 gallons per coat. Two coats are standard, so approximately 3.5-4 gallons total.
How many square feet does a gallon of paint cover?
A gallon of interior paint covers 350-400 square feet per coat on smooth surfaces.
How much does it cost to paint a room?
DIY costs $100-$200 for paint and supplies. Professional painters charge $300-$800 for the same room.
Do I need primer before painting?
Recommended for new drywall, covering dark colors, or switching paint types. Many modern paints include primer.
How many coats of paint should I apply?
Two coats are standard. High-quality paints may cover in one coat on similar colors.
Related Tools
Concrete Calculator
Calculate the exact amount of concrete needed for slabs, footings, or columns.
Roofing Calculator
Calculate roofing shingles and underlayment needed for your project.
Tile Calculator
Calculate the exact number of tiles needed for floors, walls, or backsplashes.
Drywall Calculator
Calculate drywall sheets, tape, mud, and screws needed.