The total cost of your roofing job is determined by square footage, pitch of your roof, and the materials you want – but don’t worry, even if you didn’t get an A+ in high school geometry and algebra, you can do the math.
To estimate the cost of a major roof repair or replacement you’ll need to figure out the square footage of your roof. For this, you need to know your roof’s base area and the angle.
- Your first task is to stop looking up – and start looking down. Measure the ground dimensions of your house using a tape measure. Then, multiply length times width to get the ground area. Your house probably isn’t a perfect square or rectangle, so take each square piece one by one. Figure out the separate areas and then add them together.
- Once you have the ground area, convert that number to roofing squares. One roofing square equals 100 square feet of roof. So, divide your total ground area by 100 – that is how many roofing squares your roof will need.
- Estimating the pitch of your roof is much easier than your high school geometry class – we promise! In fact, roof pitches come in 3 categories: Low, Medium, and High. A high pitch roof rises more than 9 inches for every 12 inches of base horizontal length; medium pitch rises 6-9 inches, and a low pitch rises 3 inches for every foot of horizontal length. To find out your pitch, grab a level and a tape measure and climb a ladder to where your roof begins. Hold the level horizontally, about a foot from the bottom of the roof. Find the 12 inch mark on the level, and measure straight down to the roof using the tape measure.
- For a low-pitch roof, multiply the number of roofing squares by 1.06 to 1.08 to get the square roof area. For a medium pitch roof, multiply by 1.12 to 1.25; and for a high pitch roof, multiply by 1.3 or 1.4.
To make life easier, we have a Free Roofing Estimate Calculator! Just enter in your roof square footage, your roof pitch, and roof type and we will send you our estimate.