This free roof calculator estimates the area of a roof and the amount of materials needed to replace or build that roof. A bundle of shingles is called a bundle. Ft. They can be saved in case the roof is damaged later or if repairs are needed in the future. Example of a gable roof In this publication, you would need 24 squares of subfloor for roofs.
A square roof is an area of 10x10 of roof surface equal to 100 square feet. For example, 2000 square feet of roof area equals 20 square feet. Now you'll want to calculate the area by multiplying the length by the width. For buildings with more complex shapes, you'll need to divide the diagram you made with the size of the house into rectangles and squares to find the square footage of each one before adding them up. If parts of the building are shaped like a triangle or a trapezoid, the formula becomes a little more complicated.
The complexity of the roof refers to the way in which the roof is cut, for example, the multiple facets, the different inclinations, the slopes, the valleys, the pediments, the dormers and the number of floors with respect to the ground.
Keep the report handy for future discussions with roofers or to review estimates for your next roof replacement or repair.
The steeper the roof, the more the slope increases the total surface area of a facet or the entire roof. That's why I wrote another article breaking down the average cost of a new roof in 2024, the costs per square foot of the most popular roofing materials, and more. If you are also installing a subfloor for ceilings, you will need the same amount of subfloor to cover the roof covering. Therefore, while it can be cumbersome, measuring the area and slope of each part of the roof and multiplying it by the corresponding correction factor will result in a more accurate estimate of roofing materials.necessary. If these spaces have a roof directly above them, they won't count in the square footage of your house, leaving a large part of the roof area out of the way. The complexity of the roof is simply the way in which the roof is cut, for example, the multiple facets, the different inclinations, the slopes, the valleys, the gables, the dormers and the number of floors relative to the ground. While it may seem difficult at first, you can divide your roof into 10 x 10-foot squares, a standard unit of measurement used by roofers.
In cases where a roof has a complex shape, as in the image on the right, measuring the dimensions and areas of each part of the roof to calculate the total area will result in a more accurate measurement of the area. See the 11 factors that affect the cost of your new roof to learn how a roofing contractor calculates the final number of an estimate. Drawing a roof diagram is an essential step, especially if the roof has complex shapes and angles.
