Interior Paint Calculator

To accurately estimate the amount of paint you need to cover your walls and trim, just fill in the blanks and hit "calculate" to tabulate your results. Paint is sold in quarts, gallons and five gallon quantities.

Calculator Inputs

Room Wall Sizes

Room Length: ft. in.
Room Width: ft. in.
Room Height: ft. in.
Baseboard Height:   in.


Number of Windows:  
Window Height: ft. in.
Window Width: ft. in.
Molding/Trim Size:   in.


Number of Doors:  
Doors Height: ft. in.
Doors Width: ft. in.
Molding/Trim Size:   in.

If you have windows or doors with different heights and widths, average the window or door dimensions. For example, one 3 x 5 window and one 5 x 7 window would be approximately two 4 x 6 windows.

Paint Coverage

square feet per gallon

350 square feet per gallon is the industry average. If you know the exact number for your specific paint, enter it.

Calculator Results

Wall Paint: 0 gallons
Ceiling Paint: 0 gallons
Trim Paint: 0 quarts
Baseboard Paint: 0 quarts

Please Note: Calculator Results have been rounded up to the nearset whole number.

Other Calculators


Important Disclaimer: This calculator is provided for general information and illustration purposes only; the results are to be used only as estimates and are not intended as definitive advice or as a resource applicable to any specific circumstance and should not be relied upon or used as such. The Home Depot cannot guarantee that you will achieve proper results without verifying your measurements and assumptions. For specific advice regarding your project, you should engage the services of an associate in your local Home Depot store.