Paint Calculator
Calculate exactly how much paint you need for your next project, saving time and money.
Calculator
Total Area:
334.0 sq ftPaint Needed:
1.7 gallonsHow it Works
This paint calculator helps you determine how much paint you'll need for your project by taking into account the dimensions of your walls, the number of doors and windows, and your painting preferences.
How It Calculates
The formula used is: Paint Needed = (Wall Area - Openings) × Number of Coats ÷ Coverage per Gallon
The calculator automatically accounts for standard door sizes (about 20 sq ft) and window sizes (about 15 sq ft). It then multiplies the paintable area by your desired number of coats and divides by the paint coverage to determine how many gallons you'll need.
Tips for Accurate Estimation
- Measure wall height from floor to ceiling
- For textured walls, choose a lower coverage per gallon (250-300 sq ft)
- For smooth walls, coverage can be higher (350-400 sq ft)
- Dark colors over light colors may require additional coats
- Round up to the nearest gallon or quart when purchasing