# How to Calculate the Cost of Roof Painting

Estimates given by contractors for roof painting vary widely and can often range from a few hundred to thousands of dollars. Because of this, many homeowners choose to bypass the professionals in favor of a do-it-yourself approach. In this case, the only financial cost you'll incur is the price of the paint itself. If you need to calculate the cost of roof painting, you'll need to remember a few of the basic math lessons you learned back in school. Fortunately, the equations required to calculate the cost of roof painting are fairly simple. And, with the help of a calculator, even the worst mathematicians should have little difficulty figuring out the amount of paint they'll need to coat their home's roof.

## Step 1

Measure the width of the house on one side.

## Step 2

Measure the length of the house on one side.

## Step 3

Multiply the two numbers together to get the surface area of the roof in feet.

## Step 4

Check the labeling on the paint you intend to buy for exact coverage (a number in feet) per gallon.

## Step 5

Divide the number from Step 3 by the number on the labeling for the exact number of gallons required to paint the roof.

## Step 6

Multiply the number of gallons by the price per gallon and this will give you the overall cost of paint for the roof.

## Things You Will Need

- Tape measure
- Calculator

## Tips

- If your roof has overhang, you'll need to factor this in. You can do this by measuring the overhang and multiplying this number times the length and width of the home. For example: if the roof overhangs by two feet on every side of the house, you'll need to multiply the length of the house by two, the width of the house by two and then add these numbers together. This will give you the amount of paint required to paint just the overhang portion.
- If your roof is sloped, you will require about 5 percent more paint to cover it. In this case, you'll need to multiply the number from Step 3 by 0.05. Then, take this number and add it to the original number from Step 3 to get the surface area of the roof in feet.