Quick Interior Calculation

Enter the dimensions of the room.

Interior
Measure and total the height and width around your room.
ft.
ft.
How Many?
How Many?
Results
Total Walls
Gallons
sq. ft.
Total Ceiling
Gallons
sq. ft.
Save
Estimated gallons needed per coat
Total Walls
sq. ft.
gal
# of Windows
# of Doors
Total Ceiling
sq. ft.
gal
Still not sure how much paint you'll need? Visit your local store and Ask Sherwin-Williams.

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The results of this calculation are for one coat of paint. It assumes one gallon will cover approximately 400 square feet. The calculation is based on 3'x7' doors and 3'x5' windows. To ensure optimal coverage, we recommend rounding up to the nearest gallon.

The paint calculator is intended to provide the user with an approximate estimate. Paint requirements will vary according to factors such as application method and surface condition. To verify paint amounts, visit your neighborhood Sherwin-Williams store and speak with a representative.

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