The Gambrel Roof Square Footage Calculator is designed to help you accurately determine the total roof area, lower and upper roof angles, slope percentages, and the upper ridge length of a Gambrel-style roof. This calculator is handy for roofing projects, providing exact measurements necessary for material estimation and construction planning.

The "Lower Slope Length" is measured from outside wall to the start of the upper sloped roof section.

Calculator

1. enter the length of the building in feet and or inches
2. the width of the building in feet and or inches
3. the eave overhang in inches
4. the gable overhang in inches
5. the lower roof pitch as a ratio over 12 (e.g. 9 for a 9:12 pitch)
6. the horizontal length of the lower roof slope in feet and or inches
7. the upper roof pitch as a ratio over 12 (e.g. 3 for a 3:12 pitch)

Results

1. the calculated total area of the Gambrel roof in square feet
2. the length of the upper ridge of the roof in feet
3. the area of the lower section of the roof in square feet
4. the angle of the lower roof section in degrees
5. the slope of the lower roof section expressed as a percentage
6. the area of the upper section of the roof in square feet
7. the angle of the upper roof section in degrees
8. the slope of the upper roof section expressed as a percentage