🎨 Paint Calculator
ft
ft
ft
Results
Paintable wall area≈307 sq ft
Paint needed≈1.8 gal
Gallons to buy≈2 gal
⚠️Estimate — coverage varies by paint brand, wall texture, and color. Based on ~350 sq ft/gallon.
How to Use This Calculator
Estimate how much paint to buy for your room. Enter the room dimensions, ceiling height, number of coats, and subtract doors and windows to get an accurate gallon count.
- Measure the room length and width in feet.
- Measure the ceiling height (standard is 8 feet).
- Count the number of doors and windows to subtract.
- Choose how many coats you plan to apply (usually 2).
- Read the total gallons needed and round up to whole cans.
How the Calculation Works
The calculator computes total wall area (perimeter × height), subtracts standard door (21 sq ft each) and window (15 sq ft each) openings, multiplies by the number of coats, then divides by 350 sq ft per gallon coverage.
Example
A 12 ft by 14 ft room with 8 ft ceilings, 1 door, and 2 windows: wall area is 416 sq ft minus 51 sq ft of openings = 365 sq ft. With 2 coats, you need about 2.1 gallons — buy 3 gallons.
Pro Tips
- One gallon covers approximately 350 square feet on smooth surfaces.
- Textured walls or bare drywall absorb more paint — plan for 250-300 sq ft per gallon.
- Dark-to-light color changes may need a primer coat plus 2 top coats.
- Buy a little extra for touch-ups rather than trying to color-match later.
Related Calculators
Related Converters
Ad placement