Rafter Length Calculator

A useful shed roof rafter calculator to calculate the rafter length for the given dimensions of the roof of the building or a structure. Rafter is the beam supporting the building. Find its length with our online rafter length calculator.

Shed Roof Rafter Calculator

Overhang
Roof Span
Pitch /12
(OR)
Angle degree

A useful shed roof rafter calculator to calculate the rafter length for the given dimensions of the roof of the building or a structure. Rafter is the beam supporting the building. Find its length with our online rafter length calculator.

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Formula:

Rafter Length using Angle = V + R/(2cos(A))
Rafter Length using Pitch = V + (R/2)sqrt(1+P2)
Where, V = Overhang R = Roof Span P = Pitch

Use our online Rafter Length Calculator to quickly compute the length of the shed roof rafter by entering the measurements of overhead, length of roof span, pitch or angle. This calculator helps you make the rafters of the suitable sizes required for your roofing.

Rafter: Rafter is a sloping beam (usually wood) that supports a pitched roof. There could be many rafters supporting a roof. It is one of a series of sloped structural members that extend from the ridge or hip to the wall plate designed to support the roof deck and its associated loads. A pair of rafters is called a couple. In home construction, rafters are normally made of wood.

Rafter Length Formula: While making roofing for your house with the roof rafters, it is important to know the rafter length to make the roof seat perfectly on the rafter. Given here are the formulae to calculate the length of a shed roof rafter to make your roofings stronger and look beautiful. You can calculate the rafter length with the measurements using pitch or using the angle, which are given above.

Example:

A roof span of 8 feet has an angle of 35° and an overhead of 12 feet. Calculate its rafter length?

Solution:

Shed Roof Rafter Length = 12 + 8 / (2cos(35))
= 16.8831 feet

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