Put Your Measurements Into the Calculator
After you have rough dimensions, enter them in the roofing squares calculator. The calculator can adjust for pitch, complexity, waste, and metric inputs.
Measure the Footprint Safely
Start with the easiest safe measurements: the length and width of the roofed building footprint. Include attached garages, covered porches, additions, and other areas under the roof. If the home is not a simple rectangle, split it into smaller rectangles and add them together.
Do not climb onto a steep, wet, icy, or damaged roof to measure. Ground-level measurements are less exact, but they are much safer for early planning.
Use Home Dimensions or Satellite Views Carefully
Floor plans, county sketches, and satellite views can help you estimate the footprint. They may miss overhangs, porch roofs, dormers, or additions, so treat them as starting points rather than final material quantities.
| Source | Helpful for | Watch out for |
|---|---|---|
| Tape measure from ground | Basic length and width | Access, landscaping, and irregular shapes |
| Floor plan | Major footprint sections | Overhangs and exterior roof details |
| Satellite view | Roof shape and sections | Scale, tree cover, and image angle |
| Contractor measurement | Final quote and ordering | Scope assumptions should still be reviewed |
Break Complex Roofs Into Sections
If the roof has multiple wings, valleys, or additions, calculate each section separately. Add the adjusted section totals before applying waste if you are using a detailed worksheet, or use the calculator for a reasonable whole-roof planning estimate.