A: Our easy-to-use Paint Calculator tool takes the guesswork out of determining how much paint you'll need. Just enter the measurements of the surface to be painted and our tool will calculate the amount of gallons per coat needed. Make sure to include measurements for windows, doorways, and trim to return a more precise calculation.
How to Use Paint Calculator
Preparing for a paint project? Use our paint calculator to figure out how much paint you'll need.
Which Calculation Is Right for Your Project?
Quick Calculation
Painting just one simple room or a statement wall? Use our Quick Calculation option.
Custom Calculation
If you're painting a space with baseboards, ceilings or crown moldings to account for, choose our Custom Calculation option.
Deck Calculation
If you're painting a porch or deck, choose our Deck Calculation option.
Note: Product requirements will vary according to factors such as application method and surface type or condition. To verify product amounts, visit your neighborhood Sherwin-Williams store and speak with a representative.
Paint Calculator FAQs
A: With typical application, a gallon of paint covers about 400 square feet.
A: On average, it will cost between $100 and $300 dollars to paint a 12 x 12 room. However, this can vary based on the type of paint purchased.
A: A 5-gallon bucket of paint can cover up to 2000 square feet of space.
Sign Up for PaintPerks®
Get exclusive deals and discounts
