This is the horizontal measurement from the outside of the wall to the inside of the ridge. The length of the rafter is given from the long point of the ridge cut at the top down along the top edge the board to the same plumb cut on the rafter’s notch. The results are automatically fired as soon as any of the values are entered or altered. Determine a thickness for the ridge and use the drop down to select it.Use the blueprints to establish a pitch for the roof.For advanced users simply use the inches box to enter a decimal value.Then use the drop down to select a value for the fraction.Use the number boxes to enter the value in feet, inches, and fraction, inches and fraction.If they are not, then click here for the unlevel wall rafter calculator. This must be from walls that are of equal heights. Take a direct measurement of the width of the roof.Once this page is opened, the calculator will work without an internet connection. If there will be no internet connection at the job site, then go ahead and open this page on a device such as a laptop or a smartphone in a location where there is an internet connection.See the detailed instructions below for any further questions. They include :Įnter the value for the roof width (outside to outside) in feet, inches, and fraction, inches and fraction, or use the inches box to enter a value in decimals if that is your preference.
#Rafter tables free
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. The results are automatically fired.
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