Simple roof surface, squares and shingle-bundle planning.
Roof footprint or planes, pitch factor, waste and bundle coverage.
Sloped area, roofing squares and field-shingle bundles.
Starter, ridge, flashing, underlayment, ventilation and roof condition need separate checks.
See the estimated project quantity from your measurements.
Add waste and round to complete bags, boxes, cans, bundles or delivery quantities.
Review product coverage, site conditions, local requirements and supplier details before ordering.
Estimate simple gable roof area, roofing squares, and shingle bundles from footprint and pitch.
Use the result card above to copy, print or share the estimate, then verify the final order with the product label or supplier quote.
For a simple gable footprint, the calculator applies a slope factor based on rise per 12 inches, then adds your waste allowance and converts the result into roofing squares and bundles.
A 6:12 roof uses a slope factor of about 1.118. A 40 × 28 ft footprint is therefore larger on the sloped roof surface than on the horizontal plan.
Important: this is a planning estimator for simple roof geometry. Valleys, hips, dormers, overhangs, starter courses, ridge caps, flashing, code requirements, and manufacturer instructions can materially change the order.
One roofing square equals 100 square feet of roof area.
Three is common for many products, but not universal. Enter the bundle count for the shingle product you are using.
Split complex roofs into measured planes and confirm the final takeoff with a qualified roofer or supplier.