Project Calculators

From This Old House

Paint & Wallcoverings


Yard & Garden

More Tools


Total length of all walls in feet

Round up to the nearest foot, and be sure to count all length. A rectangular garage that's 8 x 15, for example, is 8 + 15 + 8 + 15 = 46 feet total in length. The total length of a house with ells, extensions, and bays needs to be calculated wall by wall.

Wall height in feet:

If you don't know how tall the wall is, assume about 10 feet for each story, or 20 feet for a two-story house and 30 feet for a three-story house. If you have a pitched roof that creates a higher wall on one side of the house than the other, use the average height. For each overhang, add two feet to the wall height.


This section will estimate the amount of paint you need to cover the doors and the door and window trim, and will subtract the area of those openings from the wall measurements. For house exteriors, many professional painters figure windows and doors ''solid'' - that is they don't subtract the window and door area from the wall area total, because it represents such a small percentage of the overall paint coverage. To figure your project ''solid'', leave this section blank when calculating the walls, then calculate again filling in this section and leaving the wall section blank.


Window height in inches:

Window width in inches:

Number of like-sized windows:

Round up to the nearest inch on these measurements.


Door height in inches:

Door width in inches:

Number of like-sized doors:

Round up to the nearest inch on these measurements.

Around The Web

Bold Style Calendar

Improve Your Mood

Add more lighting to your home to combat the darker days that fall brings. The extra light will... » See Full Calendar