THE ROOFKARMA RESOURCE LIBRARY
Roofing Measurement, Estimation & Technical Industry Resources
Roofing measurement, estimation & technical industry resources. Free tools, useful definitions and guides you can put to work.
Put pitch into perspective.
Turn rise and run into a pitch ratio and area multiplier. See the formula and the assumptions.
Try the pitch calculator
8 resources
Featured Free Tools
Calculate pitch, roofing squares and waste scenarios with explicit units and assumptions.
Roof Pitch Calculator: Ratio, Angle & Multiplier
Convert vertical rise and horizontal run into pitch, angle and a surface-area multiplier.
Explore resourceRoofing Waste Factor Calculator
Compare 10%, 12%, 15% and 20% waste scenarios against your net roof area.
Explore resourceRoofing Square Calculator: Footprint to Roof Area
Convert roof area into squares with a clear choice between sloped surface and horizontal projection.
Explore resourceTechnical Glossary
Look up the roofing terms used in measurement reports and material lists.
Measurement Guides
Learn how evidence, facet ledgers and material quantities fit together.
Grade A to D Aerial Measurement Standards Explained
A confidence grade describes the evidence behind a report. It does not establish a universal percentage error.
Explore resourceHow to Read a Measurement Report & Facet Ledger
Start with the report identity, the area basis and the evidence. Then follow the measurements into the details.
Explore resourceRoofing Waste Calculation for Complex Roofs
A useful allowance starts with the roof layout and the selected product, with every assumption visible.
Explore resourceRoofing Questions, Answered
Find direct answers to common roofing measurement and estimation questions.
How many square feet are in a roofing square?
One roofing square equals 100 square feet of roof surface area. Sloped surface area can differ from the horizontal footprint.
What waste factor should I use for a hip roof?
The allowance depends on layout, material system and installation details. Compare labeled scenarios, then confirm quantities against the selected product and project. A roof type alone does not establish a universal percentage.
How accurate are aerial satellite roof reports?
Accuracy depends on the imagery, roof visibility, geometry and measurement method. Review the report’s sources, confidence and limitations; a confidence grade alone does not establish a universal percentage error.