How Does This Calculator Work?
One gallon of paint typically covers about 350 square feet with one coat. The calculator multiplies your wall area by the number of coats, then divides by 350 to estimate total gallons.
Running out of paint mid-wall means an inconvenient store run and a potential color-match issue between cans. This calculator estimates the gallons you need from your total wall area and how many coats you plan to apply.
Example Calculation
Bedroom Repaint Example
400 sq ft of wall area, 2 coats.
(400 × 2) ÷ 350 ≈ 2.29 gallons.
Tips
Textured or unprimed surfaces absorb more paint — consider rounding up, and always buy a little extra for touch-ups.