Roofing Calculators for Area, Pitch and Materials
Pick the calculator that matches your task. Each tool shows the formulas it uses and a labeled diagram so you can check the numbers before you order materials or compare a quote.
This site is a transparent planning toolkit for United States roofs. Two paths cover most jobs. Choose area and materials when you need square footage, roofing squares and shingle bundles for a replacement roof. Choose pitch and rafter geometry when you are framing or checking common, hip and jack rafter lengths. Every result is calculated from first-principles geometry, not copied from another estimator.
Area and materials
Estimate roof area, roofing squares, shingle bundles and hip-and-ridge cap. Waste and coverage are editable so the order quantity matches the product you actually buy.
Open the roof area calculatorPitch and rafter geometry
Convert roof pitch between X/12, degrees and percent, then calculate theoretical common, hip and jack rafter line lengths with clear measurement conventions.
Open the roof pitch calculatorStart with the hip roof calculator
The flagship tool combines area, rafter geometry and material estimates for a regular equal-pitch hip roof, with a labeled diagram that shows where to measure.
Open hip roof calculatorNone of these tools require an account, an email address or a download. They run entirely in your browser, and they keep the net roof area separate from the material order quantity so you always see both numbers.