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Panels will arguably be the trickiest part of this calculation. It is important to keep in mind that not all the panels are the same width - our standard S36 panel is 36" or 3' wide.

You need to first find how many panels you will need to cover the width of the roof - then you will need to find the panel length.

It is best to focus on one section at a time, as panel lengths and width requirements may vary!

If section 1 is 32' long (along the light blue (eave) side), that means that you will need 11 panels to cover that width.

However, as you can see in the diagram's bird's eye view, the red line (ridge line) is longer. In this case, we will use the red to calculate how many sheets are needed - lets say its 40' - so we will need 14 sheets.

Now that we know how many sheets are needed, we need to know the sheet length. for that, you will need to get the gable side measurement (in dark blue on the diagram). Often times - there will be an overhang, the overhang MUST be included in the length of the sheet.

For examples sake - lets say our sheet length needs to be 10'.

Your sheet requirement for section 1 would be: 14 sheets at 10'. or 140LF, or 420sqft.

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Calculating siding panels are much easier than roof panels.

To calculate how many panels you need, you need to aquire the width measurement (the green line along the bottom) in feet, and divide by 3 (our S36 panels are 3' long). If you get a decimal, always round up.

For the length measurement of your sheets, measure how high the peak of your roof is (where the two dark blue lines meet).

if you are measuring for the side of the house that doesn't go all the way up to the peak (eave side) then you only measure up to the eave (the yellow line would be your length measurement).