If you have a calculator with a formula editor:ġ31.97822 – ( 1 × 24 + 23.25) × tan 49.18024° – 1.22793Ĭhange the bolded value to 2, 3, etc … zero returns the first jack rafter length. This example uses two equal 7/12 slopes and a 90° corner angle but can easily be adapted to an irregular roof. Calculate the rafter length for 6/12 roof pitch, as Rafter2 rise2 + run2, Rafter2 7.52 + 152, Rafter2 56.25+225, rafter 281.25, Rafter 16.77 feet or 5.11 meters, hence rafter length for 6/12 pitch roof will be 16.77 feet long. The roof pitch calculator is a smart tool that helps you to calculate the pitch of the roof and what length of rafters you need for your construction works. Run in feet f to changes inches to feet divide by 12, ex 9/12. Difference in length to long point of first jack. Length on slope of roof to WP: 114 / cos 30.25644 131.97822. Note: If you are calculating rafter length from the center of the ridge beam, you will need to subtract half of the thickness of the. You must know three variables to solve this equation. Common Rafter Pitch Angle 30.25644 Plan Angle 45 Sheathing Angle 49.18024 Run (inches): (19 × 12) / 2 114. Online Rafter Length Calculator Calculate the length of common rafters with this free and easy online tool by entering a dimension for the roof width, selecting a pitch for the roof, and the thickness of the ridge. This calculator is to be used as an estimating tool only. How to figure the length of a rafter on a porch or shed roof. Click the button to calculate the stock size needed for this job. Using the Sheathing angle and a different set of dimensions is also a good way of double checking calculations. Input the rafter span (on the flat), eave overhang and pitch of the roof. Equation for calculate rafter length is, Rafter Length using Pitch V + (R/2)sqrt (1+P2) Where, V Overhang. Another method of solving the jack rafter lengths is to treat all the working points as if they lie on the surfaces of a backed Hip rafter and ridge board.
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