Shed Roofing Calculator
Estimate sloped shed-roof area, shingle bundles, underlayment rolls and material cost from shed dimensions, overhangs, roof pitch and waste.
Default project preview
5 bundles
Sloped roof area
150.7 ft²
Horizontal plan area
143 ft²
Slope factor
1.054
Underlayment rolls
1
Calculator
Build the material order
Your order will appear here
Enter the project details and calculate a rounded material estimate.
Methodology
Transparent calculation
BuildMeter converts every input to a consistent internal unit, applies the selected allowance, and rounds products up to whole purchasable units.
Sloped roof area = (length with overhangs × width with overhangs) × √(1 + (rise ÷ 12)²). Waste is added before shingle bundles are rounded up.
FAQ
Shed Roofing Calculator questions
Does the formula work for a gable roof?+
Yes for a simple symmetrical gable because the total horizontal plan area is multiplied by the common slope factor.
Are ridge-cap shingles included?+
Not separately. Increase the allowance or add ridge-cap products based on the chosen roofing system.
Why is underlayment based on sloped area without waste?+
The calculator rounds full rolls up; increase entered roll coverage assumptions or waste planning for large overlaps and complex roofs.