Room Paint Calculator
Enter your room dimensions and get accurate paint estimates. Include windows and doors for the most precise results.
Room Dimensions
Windows & Doors
Windows
Doors
Paint & Surface
Calculation Results
Fill out the form and
click "Calculate" to see
your paint estimate.
How to Calculate Paint Amount?
📐 Basic Calculation
- • Wall area = (Length × Height) × 4 walls
- • Subtract window and door areas
- • Divide by paint coverage (sq ft/gallon)
- • Multiply by number of coats
🎯 Important Factors
- • Wall surface type (drywall, plaster, wood)
- • Paint type (flat, eggshell, satin, semi-gloss)
- • Color change situation
- • Add 10-15% waste allowance
💡 Professional Tips
Use flat paint for bedrooms, semi-gloss for kitchens and bathrooms.
Prime first, then apply two coats of paint for best results.
Quality paint is more economical in the long run.
Frequently Asked Questions
How accurate is the calculation?
Our calculator provides 95% accuracy based on professional standards. However, surface condition and application technique may affect the final result.
Is waste allowance included?
Yes, our calculator automatically adds 15% waste allowance. This covers spills, touch-ups, and future maintenance needs.
Does it work for different paint types?
Yes, you can use it for all interior paint types including latex, acrylic, and oil-based paints. Coverage rates are automatically adjusted based on paint type.
Does it calculate ceiling paint?
Currently, it calculates wall paint only. For ceiling paint, use the formula: room area (length × width) ÷ paint coverage.