Paint Calculator - Interior Walls/Ceilings (No Trim)
 
This calculator is offered as a convenience and is intended to be used for estimating only.  It does not take into account any unusual characteristics your actual room may exhibit, such as niches, offsets, wainscots, and cathedral or coffered ceilings.  If you are having a custom color mixed, it is always wise to buy additional paint at the same time to be sure you have an adequate amount for any later touch-ups.  You can print this completed form and take it with you to show your local salesperson for verification of the amount of paint needed.
 
Interior Wall/Ceiling Paint Calculator
ft. in. Room Width
ft. in. Room Length
ft. in. Ceiling Height
# of Doors (Single)
# of Doors (Double)
# of Windows (Small - 12 s.f.)
# of Windows (Large - 25 s.f.)
Bucket Coverage (sq. ft.)

 

Please enter the dimensions of the room, the number of doors and windows, and the capacity of each paint bucket. Press "Calculate" to receive your answer.

Though sizes vary, single doors are assumed to be 17 sq. ft. and double doors to be 35 sq. ft. (not painted), small windows to be 12 sq. ft. and large windows to be 25 sq. ft.  Be sure to include any entry openings - even if there is no actual door!

The average coverage of one gallon of interior latex wall paint over primed or previously painted drywall is normally between 375 and 400 sq. ft.