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Paint Calculator
Accurately estimate how much paint you need for your room based on dimensions.
Key Features
- Calculates total surface area
- Accounts for doors and windows
- Recommends number of gallons/liters
How to Use
Enter the width and height of each wall, specify the number of doors and windows, and we'll calculate the exact amount of paint required for a professional finish.
Interactive Paint Calculator
Calculation Formula & Logic
Gallons Required = (Total Wall Area - Door & Window Deductions) × Number of Coats ÷ 350 sq ft per gallon
*Calculations represent industry standard metrics used by licensed design consultants and construction specialists. Always incorporate structural layout constraints and material margins.
Expert Pro-Tips
- ✓Measure wall length and height from baseboard to ceiling, ignoring crown moldings.
- ✓Deduct 20 sq ft per standard door and 15 sq ft per average window to avoid overestimating.
- ✓Always add a 10% safety buffer for textured walls and future touch-ups.
Frequently Asked Questions
Q: How much wall area does one gallon of paint cover?
A: One standard gallon of wall paint covers approximately 350 square feet of smooth plaster or drywall with a single coat.
Q: Do I need to calculate ceiling paint separately?
A: Yes. Ceilings are typically painted with flat ceiling paint rather than wall finishes. Calculate the ceiling area by multiplying room width by room length.