Paint Calculator

Paint Calculator calculates gallons of paint needed base on your room size less window and door size, also estimates the toal cost of paint.

Paint Calculator
Ceiling Area	Include Not Inculde
Room One Length
Room One Width
Room One Height
Paint Area of Room one
Room Two Length
Room Two Width
Room Two Height
Paint Area of Room Two
Room Three Length
Room Three Width
Room Three Height
Paint Area of Room Three
Door Height	Inches
Door Width	Inches
Door Number
Total Door Size
Window Height	Inches
Window Width	Inches
Window Number
Total Window Size

Total Area Need to Cover
Amount of Paint Need
Paint Price	$ per
Total Cost

Paint Calculation Formula

Paint calculator is based on there are 4 walls (with or without ceiling area coverage) in a room, less the windows or doors size, that is the total area needed to be covered for painting.

For example, if a room's length is 12 feet, the width is 10 feet, height is 7 feet. the two walls' areas are 12 x 7, and the other two walls' areas are 10 x 7.

The ceiling area is 12 x 10.

The total area without ceiling coverage will be 2 x 12 x 7 + 2 x 10 x 7 = 308 Feet².

The total area with ceiling coverage will be 308 + 12 x 10 = 428 Feet².

You can also include the door size or window size for a more accurate estimation.

The standard door size is 80" x 32", 80" x 30", 80" x 28", 80" x 36".
If you have a door size 80" x 30", the less coverage for door is
80x 30 = 2400 inches² =2400/144=16.67 feet².

for the above example, a room with ceiling coverage is
428 Feet² - 16.67 Feet² = 411.33 Feet².

Paint Coverage per Gallon
Usually, 5 gallons of paint cover up to 2000 Feet², and 1 gallon covers up to 400 Feet², so if there are 2500 Feet² of the area that needs to cover for painting, it is calculated as 2500 / 400 = 6.25 gallons.