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PAINT CALCULATOR

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Paint Calculator

Know how much paint you need before you go to the paintstore. Painting projects require about one gallon of paint to cover 400 square feet of smooth surface. You can save money and avoid waste by getting the right amount of paint for your project.

Room Calculator

Use this calculator to find how much paint you need for a RECTANGULAR room. Enter the height of the room and the lengths of the shorter and longer walls. Click Calculate to see how much paint to buy.

Wall height (in feet):

Length of longer wall (in feet):

Length of shorter wall (in feet):

Include the ceiling too?

Number of windows in the room
Number of doors in the room



Square feet of surface:

Gallons of paint needed:

Project Calculator

Use this calculator to find how much paint you need for an entire project. One by one, enter the height and length of the surfaces you want to paint. Click the Add to Project button after you enter the dimensions of each surface. The calculator keeps a running total of the surface area for your entire project.

Surface height (in feet):

Surface length (in feet):

Number of windows in this surface
Number of doors in this surface



Square feet of surface:

Gallons of paint needed:

NOTE: A rough-textured surface will require more paint than a smooth surface, so if you're on the margin, you may want to buy more.

More Information

Home maintenance - NLM/NIH Household Products Database