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The Gambrel  Roof Shingles calculator computes the number of bundle of shingles needed for a gambrel roof based on the dimensions and bundle coverage.

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 
• (SBC) Single Bundle Coverage

Gambrel Roof Area (A): The calculator returns the:

• number of standard bundles of shingles needed to cover roof area
• number of bundles of ridge shingles
• number of roofing nails for normal wind conditions
• number of roofing nails for high-wind conditions.

Single Price Survey Data

The Roofing Shingles Cost Survey list the observed price of a bundle of shingles. A bundle is equal to roughly (33 1/3 ft²) or one third of a roofing square (100 ft²). The shingle price survey includes a date, the name of the store, and the five price points for shingles: economy, low, median, high and premium. One should use the pricing for roofing materials that can be bought locally.  However, the following prices are for different quality grades of shingles in the United States:

• Shingle Price Survey Date: 12/22/22
  • Cost of Premium Shingles: $90.0 USD.
  • Cost of High Grade Shingles: $52.34 USD.
  • Cost of Medium Grade Shingles: $43.32 USD.
  • Cost of Low Grade Shingles: $37.98 USD.
  • Cost of Economy Grade Shingles: $36.0 USD.

All prices are for one bundle of shingles which cover 33.33 ft². 

Roof Calculators

• Gabled Roof
  • Area of Gable Roof
  • 4x8 Sheathing for Gable Roof
  • Cost of Sheathing for Gable Roof
  • Purlins for a Gable Roof
  • Metal for a Gable Roof
  • Shingles for a Gable Roof
  • Cost of Shingles for a Gable Roof
  • Nails for Gable Roof Sheathing
  • Roofing Nails for a Gable Roof
• Hip Roof
  • Surface Area of a Hip Roof
  • Purlins for a Hip Roof
  • Metal for a Hip Roof
  • Shingles for a Hip Roof
• Shed Roof
  • Trusses for a Shed Roof
  • 4x8s for a Shed Roof
  • Shingles for a Shed Roof
  • Cost of Shingles for Shed Roof
  • Purlins for a Shed Roof
  • Metal for a Shed Roof
  • Metal for a Shed (Roof and Walls)
• Dormers
  • Metal for Dormers
  • 4x8s for Dormers
  • Shingles for Dormers
  • Purlins for Dormers

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