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Roofing tools and references.
Preview tools for roof area, pitch, shingle estimates, underlayment planning, and waste allowances.
Hub Structure
Calculators
Working calculators for quick planning.
Enter the measurements you have, keep units consistent, and use the formula notes to understand how each result is estimated.
Roofing
Roof Area Calculator
Estimate sloped roof area from plan length, plan width, and pitch.
Results
Enter the required measurements to calculate results.
Roof area = plan area x pitch factor. Buy area = roof area x (1 + waste).
Help
- Works best for simple gable/rectangular roof areas; measure complex roofs by plane.
Roofing
Roof Pitch Conversion
Convert rise-in-12 roof pitch to angle and pitch factor.
Results
Enter the required measurements to calculate results.
Angle = atan(rise / 12). Pitch factor = sqrt(12^2 + rise^2) / 12.
Help
- Uses rise per 12 inches of horizontal run.
Roofing
Shingle Bundle Estimate
Estimate roofing squares and shingle bundles from roof area and waste.
Results
Enter the required measurements to calculate results.
Squares = roof area / 100. Bundles = area with waste / 33.3 sq ft per bundle.
Help
- Assumes standard three bundles per square; specialty shingles may differ.
Roofing
Underlayment Estimate
Estimate underlayment rolls from roof area, waste, and roll coverage.
Results
Enter the required measurements to calculate results.
Rolls = roof area x (1 + waste) / roll coverage.
Help
- Coverage varies by product, overlap, slope, and local requirements.
Roofing
Waste Factor Calculator
Apply a waste percentage to a measured quantity.
Results
Enter the required measurements to calculate results.
Order quantity = measured quantity x (1 + waste percentage). Waste quantity = order quantity - measured quantity.
Help
- Use units consistently, such as sq ft, linear ft, pieces, or cubic yards.
Quick References
Practical reference slots.
This area is ready for formulas, terminology, measurement notes, unit conversions, and checklists as each tool is verified.
Before You Calculate
Start with clear measurements.
Gather roof plane dimensions and pitch information.
Separate simple areas from complex transitions where possible.
Note existing layers, access, and material type before estimating.