Enter your room dimensions and paint preferences, then click "Calculate Paint Needed" to see your results.
Paint Needed
0Gallons
for walls - 2 coats
📐 Calculation Breakdown
🎨 Paint Requirements
Surface
Area
Coats
Gallons
Est. Cost
📋 Complete Shopping List
💰 Cost Summary
👷 Professional Comparison
📅 Project Schedule
Task
Est. Time
💡 Cost-Saving Tips
⚠️ Alerts
🔧 Maintenance Schedule
Paint Guide & Tips
📖 How to Use This Calculator
Enter your room dimensions or total wall area
Subtract doors and windows for accurate coverage
Select paint quality, finish, and surface type
Choose number of coats based on color change
Add primer if needed for best results
Review complete materials list and cost breakdown
🎨 Paint Finish Guide
Finish
Durability
Best For
Flat/Matte
Low
Ceilings, low-traffic
Eggshell
Medium
Living rooms, bedrooms
Satin
Med-High
Family rooms, hallways
Semi-Gloss
High
Kitchens, baths, trim
High-Gloss
Highest
Doors, cabinets
🪣 When to Use Primer
Always use primer when:
Painting over dark colors with light colors
Covering stains (water, smoke, marker)
Painting new drywall or bare wood
Painting glossy surfaces
Making significant color change
✅ Pro Painting Tips
Cut in first, then roll for best blend
Use a paint grid instead of tray for faster loading
Keep a wet edge to avoid lap marks
Don't press too hard on roller
Remove tape while paint is slightly tacky
Keep room between 50-85°F for proper drying
❌ Common Mistakes to Avoid
Skipping surface prep (causes peeling)
Not using primer when needed
Painting in extreme temperatures
Removing tape after paint fully dries
Overloading brush or roller (causes drips)
Not maintaining a wet edge (causes lap marks)
🧪 Paint Type Comparison
Type
Dry Time
Cleanup
Best Use
Latex
1-2 hrs
Water
Interior walls
Acrylic
1-2 hrs
Water
Interior/Exterior
Oil-Based
6-8 hrs
Solvent
Trim, cabinets
Frequently Asked Questions
One gallon of paint typically covers 350-400 square feet on smooth, previously painted surfaces. Coverage decreases to 250-300 square feet on textured walls, new drywall, or porous surfaces. Premium paints often cover up to 400 square feet per gallon.
For most projects, yes. Two coats ensure even coverage, true color representation, and better durability. One coat may suffice for touch-ups or painting the same color. Dark-to-light color changes often require 3 coats or primer plus 2 coats.
A 12×12 room with 8-foot ceilings has approximately 384 square feet of wall space. After subtracting a door and two windows (~45 sq ft), you have about 339 square feet. You'll need approximately 2 gallons for 2 coats with standard coverage.
Premium paints typically offer better coverage (often needing fewer coats), richer colors, easier application, and longer durability. They often save money long-term by lasting 10-15 years versus 5-7 years for economy paint. For high-traffic areas, premium paint is recommended.
Ceiling paint is specifically formulated to be thicker (less dripping), have a flat finish (hides imperfections), and be more splatter-resistant. While you can use wall paint on ceilings, dedicated ceiling paint makes the job easier and often looks better.
Both are water-based, but acrylic paint contains more acrylic polymers, making it more durable, flexible, and resistant to fading and cracking. Acrylic is better for high-traffic areas and exteriors. Latex is more affordable and works well for most interior walls.
Use primer when painting over dark colors, covering stains, painting new drywall, painting bare wood, covering high-gloss surfaces, or making a dramatic color change. If you're repainting a similar color on a clean surface in good condition, primer may not be necessary.
Semi-gloss or satin finishes are best for bathrooms and kitchens due to their moisture resistance and easy cleaning. These finishes can withstand humidity, splashes, and frequent wiping. Avoid flat paint in these areas as it absorbs moisture and stains easily.
For latex and acrylic paints, wait 2-4 hours between coats (until dry to touch). Oil-based paints require 24 hours between coats. Check the paint can label for specific recommendations. High humidity or low temperatures may extend drying times.
Textured walls require 20-40% more paint than smooth surfaces. Light orange peel texture adds about 20%, while heavy knockdown or popcorn texture can require 40% more paint. Our calculator adjusts coverage automatically based on your surface selection.
Spring and fall offer ideal painting conditions with moderate temperatures (50-70°F) and lower humidity. Avoid painting in extreme heat (above 85°F) or cold (below 50°F). Winter interior painting is fine if you maintain room temperature above 65°F.
Interior paint typically lasts 5-10 years depending on quality, finish, and traffic level. Premium paints and higher sheen finishes last longer. Kitchens, bathrooms, and hallways may need repainting every 3-5 years, while bedrooms can last 7-10 years.