Shed roof rafters calculator (skillion, pent roof)

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Rafter, Birdsmouth
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the Calculator will be available after changes in the relevant parameters.
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Choose Drawing:
Distance: 0
Calculation results
  • Roof angle (pitch): 20.32 °
Rafter, Birdsmouth
  • Rafter cut angle: 69.68 °
  • Rafter plumb cut depth: 5.56 cm
  • Total rafter lumber length: 432.11 cm
  • Rafter depth: 15 cm
  • Thickness: 5 cm
  • Total rafter length with overhang: 426.55 cm
  • Length from ridge plumb cut to upper heel cut (plumb): 85.31 cm
  • Distance from the rafter tail cut to bottom heel cut: 53.32 cm
  • Length from upper birdsmouth plumb cut to bottom plumb cut: 287.92 cm
  • Seat cut (bottom): 5 cm
  • Plumb cut or heel cut (bottom): 1.85 cm
  • Seat cut (upper): 5 cm
  • Plumb or heel cut (upper): 1.85 cm
Materials for construction
Rafter, Birdsmouth
  • Rafter depth: 15 cm
  • Total rafter lumber length: 432.11 cm
  • Thickness: 5 cm
  • Wood volume: 0.032 m3
Initial parameters
  • Units of length: cm
  • Technical drawings color: color
  • House width: 300 cm
  • Wall thickness: 30 cm
  • Wall height (high wall): 400 cm
  • Wall height (short wall): 300 cm
  • Rear or eave overhang (bottom): 50 cm
  • Front overhang (upper): 50 cm
Rafter, Birdsmouth
  • Rafter depth: 15 cm
  • Thickness: 5 cm
  • Seat cut (bottom): 5 cm
  • Seat cut (upper): 5 cm
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The calculator provides online calculation of the rafters for shed roof according to your original dimensions.

The program will calculate the parameters and the length of the rafters of a shed roof (length of the rafters, length overhang, the angle of the saw cut, the distance to drinking).

Vizualizacija 3 D, as well as drawings and design data for all the rafters are generated in real-time.


Calculator rafters of the roof with one slope, and it generates drawings and 3D model will help you in the drafting of the shed roof with his hands.

Just make all the original data, click "Calculate" and a few seconds will receive a calculation of the main parameters of rafters, rafter simulated surround the foot, detailed drawings printed on them size for easy future procurement of the rafters.

Calculation of roof system shed roof online calculator forms on the basis of applicable building codes and requirements.

Read more about shed roof and its construction, see the article How to make a shed roof. Describe what determines the angle of how to define it, and give the main idea of the construction shed roof.

Is very important to mark washed down on the rafter foot, for this final data, we present the calculated angle of the gash, which should mark washed down from the rafters, and which should be make the cut.

We also recommend you to carefully make one rafter foot, and then to use it as a template for harvesting the remaining rafters.

As a standard thickness and width of rafters decided to use a Board with an appropriate cross section of 50 mm * 150 mm. However, we should not forget that the thickness of the material for the manufacture of roof trusses is dependent on loads - as weather and load most of the roofing system, wide span, roof slope and other factors. Therefore, pre-read the articles on our website about the structure of the roof system shed roof, as well as on the correct calculation of the rafter system. Article will help you to correctly determine the source data for the calculations.

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