Roofing Guides & Resources
Learn how to calculate roof pitch, roof area, rafter length, shingles and other important roofing measurements with simple explanations, formulas and practical examples.
What Is Roof Pitch? A Complete Guide to Roof Steepness
Learn what roof pitch means, how it is expressed as a rise over run ratio, common pitch categories, and how pitch affects roof area, drainage, and material choices.
Latest Roofing Guides
What Is Roof Pitch? A Complete Guide to Roof Steepness
Learn what roof pitch means, how it is expressed as a rise over run ratio, common pitch categories, and how pitch affects roof area, dr...
How to Calculate Roof Pitch Safely & Accurately
Learn 4 practical step-by-step methods to calculate roof pitch using a carpenter's level, tape measure, pitch finder app, or rafter mea...
4/12 Roof Pitch in Degrees, Multipliers & Key Facts
What angle is a 4/12 roof pitch? Learn the exact degree measurement (18.43°), slope percentage (33.33%), area multiplier (1.0541), fram...
6/12 Roof Pitch in Degrees, Multipliers & Key Facts
Convert a 6/12 roof pitch to degrees (26.57°), slope percentage (50%), area multiplier (1.1180), and understand rafter framing, materia...
Comprehensive Roof Pitch Chart & Multiplier Guide
Use our complete roof pitch reference chart to quickly convert pitch ratios (1/12 to 18/12) to degrees, slope percentage, and surface a...
Roof Pitch vs. Roof Slope: Key Differences Explained
Understand the exact architectural difference between roof pitch and roof slope, how each is measured, and when contractors use rise/ru...
How to Calculate Rafter Length: Formulas & Step-by-Step Framing
Master rafter length calculations with the Pythagorean theorem, pitch multipliers, ridge deduction, fascia overhang, and rafter tails....
How to Calculate Roof Square Footage Accurately
Learn how to calculate true sloped roof square footage using ground footprint area, pitch multipliers, eave overhang adjustments, and w...
How to Calculate Roof Area: Formulas & Complex Roof Planes
Learn how to calculate roof surface area for gable, hip, valley, and mansard roof styles using geometric formulas, triangular breakdown...
How Many Shingles Do I Need? Bundles & Squares Estimator Guide
Calculate how many bundles and squares of 3-tab or architectural shingles you need for your roof replacement project, including starter...
What Is a Roof Pitch Multiplier? Formula & Derivation
Learn what a roof pitch multiplier (slope factor) is, how it is derived using sqrt(1 + (Rise/12)^2), and how to use it to calculate tru...
How Does Roof Pitch Affect Roof Area?
Discover how increasing roof pitch expands roof deck surface area, material costs, labor rates, and underlayment requirements relative ...