How this worksheet works
From eave width to panel order
For rectangular planes with panels running eave to ridge, panel count is driven by eave width and the panel’s net coverage—not its full sheet width. Length is calculated separately.
How to use it
- Measure eave width and the slope length from eave to ridge.
- Enter net panel coverage from the panel profile and the number of like-sized planes.
- Add the specified panel overhang and a waste allowance, then confirm lengths with the supplier.
Useful for
- Simple gable or shed roof panel counts
- Comparing 12-, 16-, and 24-inch coverage profiles
- Estimating total panel linear footage
Assumptions
- All selected planes are rectangular and the same size
- Panels run continuously from eave to ridge
- Net coverage includes the intended side-lap
Limitations
- Does not lay out end laps, tapered panels, hips, valleys, or penetrations
- Trim, clips, fasteners, closures, and sealants are separate
- Fabricator rounding and maximum transport lengths may change the order
Common checks
Questions about this calculator
What is net panel coverage?
It is the installed width covered after the required side-lap or seam engagement, which can be less than the physical panel width.
Does waste increase panel length?
This calculator applies waste to panel count and shows the specified overhang in panel length. Confirm fabrication lengths individually.