Paint Calculator

The paint calculator is used to estimate the number of gallons of paint that is required for painting a room. The paint calculator uses the surface area of the walls and subtracts the walls and windows to provide the square feet of the paintable area.

You need to answer 3 questions.

Width of each wall?
Height of walls?
How many door and windows?

Wall 1 Number of Feet:
Wall 2 Number of Feet:
Wall 3 Number of Feet:
Wall 4 Number of Feet:

Are you wondering how many gallons of paint you need?

Determine the square footage of the room by entering the width of each wall and the height of the room you want to paint. Enter the number of doors and windows in the room to provide a more accurate estimate of the number of gallons required to paint the room.

consider that unfinished walls will absorb more paint and will require additional coats

Try it now. It just takes a few seconds to find the area square feet.

Painting a room can be fun but make sure you have enough paint for the job. Calculate paint needed using the paint calculator. Measure your room and determine the width and height of the walls. Once you know the size of the area, you can use the painting calculator to find the square feet of the space and the number of gallons of paint you will need. It really is that easy. The painting estimate calculator works great when doing a calculation for square feet.

Changing from a darker color to a lighter color will likely require a second coat of paint

The paint calculator uses the following assumptions when determining the number of gallons of paint:

One gallon of paint will cover 350 square feet
Coverage is limited to one coat of paint
Standard window size of 3 x 5
Standard door size of 3 x 7

Free tool takes away the guess work when determining how much paint you need to paint a room.

The paint calculator is used for estimating the amount of paint needed for a room. Actual results may vary.

The paint calculator is used for estimating the amount of paint needed to cover an area. The information is only an estimate. Actual painting results will vary based on a number of factors including the paint being used and the surface being painted. For paint calculation purposes, the paint calculator uses 350 square feet per gallon in coverage.