Gambrel Roof Calculator
Estimate dimensions, area, and materials for a gambrel (barn-style) roof.
Building Dimensions
Total width of the building
Height from floor to eave
Length of the roof (eave to eave)
Height from floor to peak
Gambrel Ratios
Rise/Run ratio for upper slope
Rise/Run ratio for lower slope
Width of upper roof section
Width of lower roof section
Options
Add waste for cuts
Price per square foot of roofing
Sheathing adds material
Total Area
0.0
ft²
Upper Area
0.0
ft²
Lower Area
0.0
ft²
Peak Height
0.0 ft
Upper Pitch
0.0°
Lower Pitch
0.0°
Total Cost
$0
Upper Run
0.0
ft
Lower Run
0.0
ft
Roof Width
0.0
ft
Standard gambrel roof: upper slope ≈ 2.5:1, lower slope ≈ 1:1 for classic barn look.
Area = (Upper Slope Length + Lower Slope Length) × Roof Length
Slope length = √(Run² + Rise²)