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Inch or
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The main Navigation tabs at top of each page are Metric - inputs in millimeters (mm)
For Inch versions, directly under the main tab is a smaller 'Inch' tab for the Feet and Inch version.
Drop Down Menus have M for Metric Versions.
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Gambrel Roof Framing Geometry Calculator - Inch

This Gambrel Roof fits in a semicircle, and starts as the top half of an equal sided octagon. Move slider or directly enter angle to alter sweep angle of lower rafters and change the shape.
Check Overhang to calculate rafter overhang equal to the lower level cut at the full rafter depth. With overhang selected, drag slider to increment - decrement birdsmouth seat width to suit. Geometric calculator only Geometric calculator only. Check local building regulations for sizes, spans angles etc.

Wall Width
Roof Length
Sweep Angle
Rafter Depth Actual
Ridge Thick Actual
Purlin Thick Actual
Seat
Base
Check the Gussets box and enter Gusset Base width to create dimension diagrams.

Direct Measure Left click, release and drag in main diagram to directly measure dimensions..

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Sweep° Scale

Gambrel roof framing calculator plan diagram with full dimensions and angles

Gambrel roof lower rafter detail diagram
Gambrel roof upper rafter detail diagram





DON'T BREATH THE DUST If you're cutting blocks, concrete, stone or ANYTHING and there's DUST - DON'T TAKE THE RISK
Don't cut it, or cut it wet so there's NO DUST - Silicosis Sucks
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Inch or Metric? 👈
The main Navigation tabs at top of each page are Metric - inputs in millimeters (mm)
Directly under the main tab is a smaller 'Inch' tab for the Feet and Inch version.
Drop Down Menus have M for Metric Versions.



Please help promote this free service
Tell a Friend!

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