Roof Pitch Reference Chart

Every Pitch in Degrees & Area Multiplier

This Roof Pitch Chart is the complete reference table for converting every standard roof pitch from 1/12 through 24/12 into the angle in degrees and the slope multiplier used to convert flat footprint area into actual sloped roof area. A 4/12 roof has a multiplier of 1.054, meaning the actual roof surface is 5.4% larger than the building footprint. A 12/12 roof has a multiplier of 1.414. Bookmark this chart for quick reference when sizing shingles, underlayment, and decking.