`A = f( "L" , "S" ,"24/12","6/12", "AH" , 12 ) `

Enter a value for all fields

The Metal for a Gambrel  Roof calculator computes the length and number of metal panels needed for a gambrel roof based on the dimensions.  It also provides the length of the trim pieces.

INSTRUCTIONS:  Choose units and enter the following:

• (L) Ridge Length
• (S) Span of Roof
• (P₁) Lower Pitch
• (P₂) Upper Pitch
• (AH) Attic Height
• (oH) Overhang 
• (PD) PANELS or DETAILS

Gambrel Roof Area (A): The calculator returns length and number of panels for a gambrel roof.  The lengths can be automatically converted to compatible units via the pull down menu.  If DETAILS are chosen, the calculator also returns:

1. Ridge Cap: length of the ridge cap.
2. Gable Trim: total length of gable trim, equals four times a gable length
3. Metal Panels:  number and length of metal panels for the roof. 
4. Metal Screws: number of screws needed to attach panels to roof.
5. Snow Guard: total length of snow guard, equals twice the ridge length.
6. Angle Trim: total length of angle trim (used as facia).
7. Area: area of the roof in square feet.

The Math / Science

For this calculation, the panel width is assumed to be 36"

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Roof Types

Roofing Calculators

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Gambrel Roof Gambrel Roof Surface Area Gambrel Roof Shingles  Roofing Nails for Gambrel Roof Gambrel Roof Underlayment Purlins for Gambrel Roof Gambrel Roof Metal Panels Screw for Metal Gambrel Roof

Building Calculators

• Total Building Materials Calculator
• Roofing Calculators
  • Metal for a Roof - Calculates the number of metal panels for a roof.
  • Area of a Roof - Computes the area of a roof based on the pitch and the dimensions of the area covered by the roof.  It also returns the number of 4x8 sheets to cover the roof, the number of standard bundles of shingles to cover, and the number of roofing nails for both normal and high wind environments.
  • Pitch of a Roof - Computes angle of incline in the roof in both degrees and rise over 12" run (e.g. 26.6^o : 6/12) based on the length of the rise and run.
  • Number of Trusses Needed for a Roof - number of trusses needed based on the roof width and the truss spacing.
  • 4x8s needed for a roof - Calculates the number of 4x8 sheets needed to cover a roof.
  • Shingles needed for a roof - Calculates the number of standard bundles (33.3 ft²) of shingles for a roof. 
  • Roofing nails needed for a roof - Calculates the number of roofing nails needed for a roof in normal and high wind conditions.
  • Number and Length of Metal Roof Panels - Computes the length and number of metal panels and trim pieces for a metal roof.
  • Screws for a Metal Roof - Computes the number of screws needed for a metal roof.
  • Number and Length of Purlins for a Roof - Computes the number of purlins for a roof based on dimensions and spacing.
  • Number and Length of Rafters - Computes the number and length of rafter boards based on roof dimensions and spacing.
  • Number and Length of Rafter and Collar ties - Computes the number and length of rafter ties and collar ties based on roof dimensions and spacing.
• Framing Calculators
  • Number and Length of Floor Joists
  • Number of Joist Hangers
  • Compute the Cost of Floor Joists
  • Compute iJoists for larger floors
  • Compute the Number of 4x8 Sheets to cover the Deck or Floor
  • Compute the number of Decking Boards to cover the deck or floor
• Floor Construction Calculators
  • Number and Length of wall top and bottom wall plates
  • Number of Studs for a Room
  • Number of Studs in a Wall
  • Room Interior Area (wall and ceiling)
  • Cubic Feet in a Room (volume)
  • Number of 4x8 or 4x12 Sheets for a Room