Gambrel Roof Calculator
Calculate your gambrel roof dimensions with our comprehensive calculator. Estimate rafter lengths, angles, roof area, and materials needed for construction.
Step 1: Roof Dimensions
Understanding Gambrel Roof
A gambrel roof has two different slopes on each side. The lower slope is steeper than the upper slope. Common lower pitches range from 6/12 to 8/12, while upper pitches range from 12/12 to 20/12.
Step 2: Materials & Cost
About Gambrel Roof Construction
Gambrel roofs provide more interior space and are commonly used for barns, sheds, and colonial-style homes. Proper calculation ensures structural integrity and accurate material estimation.
Gambrel Roof Results
Estimated Total Cost
Roof Type Comparison
| Roof Type | Total Area | Material Cost | Labor Complexity |
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Materials Breakdown
Gambrel Roof Formula
Rafter Length = √(Run² + Rise²)
To calculate rafter lengths for gambrel roofs: 1) Calculate rise for each section using pitch ratio, 2) Calculate run for each section, 3) Use Pythagorean theorem to find rafter length. Total roof area = (Lower Rafter Length + Upper Rafter Length) × Building Length × 2.
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