Estimate gable, shed, simple hip or measured-section roof area, roof squares and whole material packages with pitch-aware geometry.
01 / PURPOSE-SPECIFIC INPUTS
02 / RESULT & INTERACTIVE INSPECTION
Material quantities are estimates. The hip model is restricted to simple equal-pitch rectangular geometry; complex roofs need measured sections. Ridge caps, valleys, flashings, overlaps, labor and structural design are not automatically included.
Gable slope A: 751.319 ft² of roof surface.
| Face / section | Surface area · selected length unit squared |
|---|---|
| Gable slope A | 751.31884 ft² |
| Gable slope B | 751.31884 ft² |
Enter your values locally; no inputs are uploaded.
Check validation feedback before reviewing the browser-generated result.
Review the explanation, copy supported outputs or reset the workspace.
Horizontal projected area is multiplied by sqrt(1 + (rise/12)²), or equivalently divided by cosine of slope angle. Horizontal overhang expands both building dimensions before the correction.
Estimate gable, shed, simple hip or measured-section roof area, roof squares and whole material packages with pitch-aware geometry. Inspect the calculated data through labeled controls and review worked assumptions before using a result.
Roofing Calculator calculations run locally in browser memory. Entered financial values, wages, measurements and other inputs are not sent to a third-party processing service or saved as a personal profile. Ordinary website page requests may still be logged. Clipboard access happens only when you choose Copy Result.
Horizontal projected area is multiplied by sqrt(1 + (rise/12)²), or equivalently divided by cosine of slope angle. Horizontal overhang expands both building dimensions before the correction.
It is a simple rectangular equal-pitch roof with equal eave heights. The ridge equals longer expanded dimension minus shorter expanded dimension, and two trapezoids plus two triangles partition the footprint. Complex hips, valleys and dormers need measured sections.
Each is an independent rectangular horizontal projection with its own pitch, including any overhang already measured. Do not overlap projected areas or add overhang again. The diagram illustrates the first section while the table retains every area.
One roof square is 100 square feet. One foot is exactly 0.3048 meters and one square foot is 0.09290304 square meters; a roof square is not one square meter.
Add the entered waste percentage once, divide by supplier coverage per bundle, then round up to whole bundles. Purchased shingle count is bundles times entered shingles per bundle, not a detailed course-by-course takeoff.
It uses either whole-bundle count times bundle price or waste-adjusted area times entered area price. It does not automatically include labor, flashing, ridge caps, fasteners, tear-off or a structural design allowance.