You can input any of the two values to get the third one calculated. Here as well, our calculator works both ways. After doing that, you will see the rafter length in the bottom-most field. If you decided to include roof pitch in your calculations, you will need to input the run and the pitch of the roof to get the rafter length. Please note that the rafter length calculator works both ways, that is, you can also use it to calculate the rise or the run! If you already know the rafter length and want to figure out any of the other dimensions, simply input the two you know, and you will get the third one. If you picked the rise, all you need to do is input its value, put in the roof's run, and the calculator will return the rafter length in the bottom-most field.If you want to learn more about the way it's calculated, check out our roof pitch calculator. You can choose the rise of the roof (which is its height) or the roof pitch (which is the slope created by the rafter). Start by deciding what you want the calculations to be based on. In the field above the illustration, pick either "rafter length" or "truss count". To start your calculations, you need to choose one of the two options mentioned above. You can use it as either a rafter length calculator, which estimates the dimensions of your trusses for you, or as a roof truss count calculator, which will allow you to estimate the roof truss costs as well (it even includes the price of installation).
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